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CVE-2026-99234

tracing: Unregister field variable histograms when the command fails

Products / packages Linux

Published

Share

Severity and exploitation

Not in CISA KEVNo CVSS score

KEV coverage does not rule out exploitation.

KEV checked 06/11/2026, 21:10:31 UTC

Severity

unknown

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Fix status not established

No structured fix or guidance is available here. Check the latest publisher advisory.

What this means

In the Linux kernel, the following vulnerability has been resolved:

Source excerpt · Linux

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

Linux · Linux

Linux

9 ranges

Compare with this publisher’s ranges. This does not inspect your installation.

affected

02205a6752f223779a1b0e9e8ffacbea6e717851 → before f21351d1c4cdcc6a68f03636a407c2af1a5e1e10

git versions

02205a6752f223779a1b0e9e8ffacbea6e717851 → before dba0f492703956801149cc70b39d2650a37995c3

git versions

02205a6752f223779a1b0e9e8ffacbea6e717851 → before a3d7ffd2409700748a495b645948fef48199206e

git versions

02205a6752f223779a1b0e9e8ffacbea6e717851 → before aae0ccd7326eef78dcdefffef3d1253e6f0615ca

git versions

02205a6752f223779a1b0e9e8ffacbea6e717851 → before 8482ec5b65f606d5bbcec518e0afc69ad65ca414

git versions

02205a6752f223779a1b0e9e8ffacbea6e717851 → before 431959fc76456cbba539279fe8967aa9391e6f23

git versions

02205a6752f223779a1b0e9e8ffacbea6e717851 → before 5afb9317e2eeb1c7021a82995ce244fda5a4bd4f

git versions

02205a6752f223779a1b0e9e8ffacbea6e717851 → before d0090baf02dd08f6e909f36f0ad54a4e80f5e79b

git versions

02205a6752f223779a1b0e9e8ffacbea6e717851 → before 91c14d6c13096091c56304120aaa26e479130b8b

git versions

unaffected

unknown

Other versions: unaffected

Linux · Linux

Linux

11 ranges

Compare with this publisher’s ranges. This does not inspect your installation.

affected

4.17

unaffected

0 → before 4.17

semver versions

5.10.273 → through 5.10.*

semver versions

5.15.224 → through 5.15.*

semver versions

6.1.191 → through 6.1.*

semver versions

6.6.161 → through 6.6.*

semver versions

6.12.115 → through 6.12.*

semver versions

6.18.60 → through 6.18.*

semver versions

7.2.14 → through 7.2.*

semver versions

7.3.1 → through 7.3.*

semver versions

7.4-rc1 → through *

original_commit_for_fix versions

unknown

Other versions: affected

Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

No structured fix or remediation guidance is available here. Check the full source description and vendor’s latest advisory for a patch or workaround; do not assume another version is safe.

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher description

In the Linux kernel, the following vulnerability has been resolved:

tracing: Unregister field variable histograms when the command fails

An action that names a field on another event needs that field as a variable, so create_field_var_hist() registers a second hist trigger on that event to provide it, and records it in target_hist_data->field_var_hists[].

If a later part of the same command fails, create_actions() returns an error and event_hist_trigger_parse() jumps to out_free. The write fails with -EINVAL and sched_switch gets no trigger, but:

echo 'hist:keys=pid:ts0=common_timestamp.usecs' >> \

  events/sched/sched_waking/trigger

echo 'my_synth u64 lat; int a; int b' >> synthetic_events

echo 'hist:keys=next_pid:wakeup_lat=common_timestamp.usecs-$ts0:\

  onmatch(sched.sched_waking).my_synth($wakeup_lat,prio,nosuchfld)'\
  >> events/sched/sched_switch/trigger

cat events/sched/sched_waking/trigger

hist:keys=pid:vals=hitcount:ts0=common_timestamp.usecs:sort=hitcount:size=2048:clock=global [active] hist:keys=pid:vals=hitcount:synthetic_prio=prio:sort=hitcount:size=2048 [active]

The second histogram is the one created for 'prio'. It is still active and still counting.

out_free reaches destroy_field_var_hists(), which frees the field_var_hists[] entries, but never unregister_field_var_hists(), which is what removes the triggers and runs only from event_hist_trigger_free(). The entry is freed and the trigger is left with nothing tracking it.

Unregister the field variable histograms in out_free as well, and record each one as soon as its trigger is registered rather than after the lookup that follows it, so no exit can leave a registered trigger untracked. The entry then belongs to field_var_hists[] and is released by destroy_field_var_hists(), so freeing it on that exit would be a double free.

References

9 sources

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance · not supplied
Weakness classification · not supplied
Additional publishers · not supplied

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-99234

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

Linux · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.17

Before: 5.10.273

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.17

Before: 5.15.224

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.17

Before: 6.1.191

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.17

Before: 6.6.161

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.17

Before: 6.12.115

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.17

Before: 6.18.60

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.17

Before: 7.2.14

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.17

Before: 7.3.1

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.17

Before: 7.4-rc1

Original applicability statements
[
  {
    "nodes": [
      {
        "operator": "OR",
        "negate": false,
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.17",
            "versionEndExcluding": "5.10.273"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.17",
            "versionEndExcluding": "5.15.224"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.17",
            "versionEndExcluding": "6.1.191"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.17",
            "versionEndExcluding": "6.6.161"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.17",
            "versionEndExcluding": "6.12.115"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.17",
            "versionEndExcluding": "6.18.60"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.17",
            "versionEndExcluding": "7.2.14"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.17",
            "versionEndExcluding": "7.3.1"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.17",
            "versionEndExcluding": "7.4-rc1"
          }
        ]
      }
    ]
  }
]
Contributing organizations · 1
Linux

Assigning organization

2026-11-03

Timeline

All times UTC
  1. Advisory published

    Publication date supplied by the source.

  2. Source updated

    Latest modification date supplied by the source.

  3. Last imported by cve.new

    Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes
  1. CVE · CVE-2026-99234

    Observed 2026-11-03T19:50:40.784Z · upstream updated 2026-11-03T19:13:02.797Z

    Product or version evidence changed

    before

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        "name": "Linux",
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            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
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            "versionType": "git"
          },
          {
            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
            "status": "affected",
            "lessThan": "dba0f492703956801149cc70b39d2650a37995c3",
            "versionType": "git"
          },
          {
            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
            "status": "affected",
            "lessThan": "a3d7ffd2409700748a495b645948fef48199206e",
            "versionType": "git"
          },
          {
            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
            "status": "affected",
            "lessThan": "aae0ccd7326eef78dcdefffef3d1253e6f0615ca",
            "versionType": "git"
          },
          {
            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
            "status": "affected",
            "lessThan": "8482ec5b65f606d5bbcec518e0afc69ad65ca414",
            "versionType": "git"
          },
          {
            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
            "status": "affected",
            "lessThan": "431959fc76456cbba539279fe8967aa9391e6f23",
            "versionType": "git"
          },
          {
            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
            "status": "affected",
            "lessThan": "5afb9317e2eeb1c7021a82995ce244fda5a4bd4f",
            "versionType": "git"
          },
          {
            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
            "status": "affected",
            "lessThan": "d0090baf02dd08f6e909f36f0ad54a4e80f5e79b",
            "versionType": "git"
          }
        ],
        "defaultStatus": "unaffected",
        "cpes": [],
        "source": "Linux",
        "url": "https://www.cve.org/CVERecord?id=CVE-2026-99234"
      },
      {
        "vendor": "Linux",
        "name": "Linux",
        "platforms": [],
        "versions": [
          {
            "version": "4.17",
            "status": "affected"
          },
          {
            "version": "0",
            "status": "unaffected",
            "lessThan": "4.17",
            "versionType": "semver"
          },
          {
            "version": "5.10.273",
            "status": "unaffected",
            "lessThanOrEqual": "5.10.*",
            "versionType": "semver"
          },
          {
            "version": "5.15.224",
            "status": "unaffected",
            "lessThanOrEqual": "5.15.*",
            "versionType": "semver"
          },
          {
            "version": "6.1.191",
            "status": "unaffected",
            "lessThanOrEqual": "6.1.*",
            "versionType": "semver"
          },
          {
            "version": "6.6.161",
            "status": "unaffected",
            "lessThanOrEqual": "6.6.*",
            "versionType": "semver"
          },
          {
            "version": "6.12.115",
            "status": "unaffected",
            "lessThanOrEqual": "6.12.*",
            "versionType": "semver"
          },
          {
            "version": "6.18.60",
            "status": "unaffected",
            "lessThanOrEqual": "6.18.*",
            "versionType": "semver"
          },
          {
            "version": "7.2.14",
            "status": "unaffected",
            "lessThanOrEqual": "7.2.*",
            "versionType": "semver"
          },
          {
            "version": "7.3.1",
            "status": "unaffected",
            "lessThanOrEqual": "7.3.*",
            "versionType": "semver"
          }
        ],
        "defaultStatus": "affected",
        "cpes": [],
        "source": "Linux",
        "url": "https://www.cve.org/CVERecord?id=CVE-2026-99234"
      }
    ]

    after

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      {
        "vendor": "Linux",
        "name": "Linux",
        "platforms": [],
        "versions": [
          {
            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
            "status": "affected",
            "lessThan": "f21351d1c4cdcc6a68f03636a407c2af1a5e1e10",
            "versionType": "git"
          },
          {
            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
            "status": "affected",
            "lessThan": "dba0f492703956801149cc70b39d2650a37995c3",
            "versionType": "git"
          },
          {
            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
            "status": "affected",
            "lessThan": "a3d7ffd2409700748a495b645948fef48199206e",
            "versionType": "git"
          },
          {
            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
            "status": "affected",
            "lessThan": "aae0ccd7326eef78dcdefffef3d1253e6f0615ca",
            "versionType": "git"
          },
          {
            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
            "status": "affected",
            "lessThan": "8482ec5b65f606d5bbcec518e0afc69ad65ca414",
            "versionType": "git"
          },
          {
            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
            "status": "affected",
            "lessThan": "431959fc76456cbba539279fe8967aa9391e6f23",
            "versionType": "git"
          },
          {
            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
            "status": "affected",
            "lessThan": "5afb9317e2eeb1c7021a82995ce244fda5a4bd4f",
            "versionType": "git"
          },
          {
            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
            "status": "affected",
            "lessThan": "d0090baf02dd08f6e909f36f0ad54a4e80f5e79b",
            "versionType": "git"
          },
          {
            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
            "status": "affected",
            "lessThan": "91c14d6c13096091c56304120aaa26e479130b8b",
            "versionType": "git"
          }
        ],
        "defaultStatus": "unaffected",
        "cpes": [],
        "source": "Linux",
        "url": "https://www.cve.org/CVERecord?id=CVE-2026-99234"
      },
      {
        "vendor": "Linux",
        "name": "Linux",
        "platforms": [],
        "versions": [
          {
            "version": "4.17",
            "status": "affected"
          },
          {
            "version": "0",
            "status": "unaffected",
            "lessThan": "4.17",
            "versionType": "semver"
          },
          {
            "version": "5.10.273",
            "status": "unaffected",
            "lessThanOrEqual": "5.10.*",
            "versionType": "semver"
          },
          {
            "version": "5.15.224",
            "status": "unaffected",
            "lessThanOrEqual": "5.15.*",
            "versionType": "semver"
          },
          {
            "version": "6.1.191",
            "status": "unaffected",
            "lessThanOrEqual": "6.1.*",
            "versionType": "semver"
          },
          {
            "version": "6.6.161",
            "status": "unaffected",
            "lessThanOrEqual": "6.6.*",
            "versionType": "semver"
          },
          {
            "version": "6.12.115",
            "status": "unaffected",
            "lessThanOrEqual": "6.12.*",
            "versionType": "semver"
          },
          {
            "version": "6.18.60",
            "status": "unaffected",
            "lessThanOrEqual": "6.18.*",
            "versionType": "semver"
          },
          {
            "version": "7.2.14",
            "status": "unaffected",
            "lessThanOrEqual": "7.2.*",
            "versionType": "semver"
          },
          {
            "version": "7.3.1",
            "status": "unaffected",
            "lessThanOrEqual": "7.3.*",
            "versionType": "semver"
          },
          {
            "version": "7.4-rc1",
            "status": "unaffected",
            "lessThanOrEqual": "*",
            "versionType": "original_commit_for_fix"
          }
        ],
        "defaultStatus": "affected",
        "cpes": [],
        "source": "Linux",
        "url": "https://www.cve.org/CVERecord?id=CVE-2026-99234"
      }
    ]
    References changed

    before

    [
      "https://git.kernel.org/stable/c/f21351d1c4cdcc6a68f03636a407c2af1a5e1e10",
      "https://git.kernel.org/stable/c/dba0f492703956801149cc70b39d2650a37995c3",
      "https://git.kernel.org/stable/c/a3d7ffd2409700748a495b645948fef48199206e",
      "https://git.kernel.org/stable/c/aae0ccd7326eef78dcdefffef3d1253e6f0615ca",
      "https://git.kernel.org/stable/c/8482ec5b65f606d5bbcec518e0afc69ad65ca414",
      "https://git.kernel.org/stable/c/431959fc76456cbba539279fe8967aa9391e6f23",
      "https://git.kernel.org/stable/c/5afb9317e2eeb1c7021a82995ce244fda5a4bd4f",
      "https://git.kernel.org/stable/c/d0090baf02dd08f6e909f36f0ad54a4e80f5e79b"
    ]

    after

    [
      "https://git.kernel.org/stable/c/f21351d1c4cdcc6a68f03636a407c2af1a5e1e10",
      "https://git.kernel.org/stable/c/dba0f492703956801149cc70b39d2650a37995c3",
      "https://git.kernel.org/stable/c/a3d7ffd2409700748a495b645948fef48199206e",
      "https://git.kernel.org/stable/c/aae0ccd7326eef78dcdefffef3d1253e6f0615ca",
      "https://git.kernel.org/stable/c/8482ec5b65f606d5bbcec518e0afc69ad65ca414",
      "https://git.kernel.org/stable/c/431959fc76456cbba539279fe8967aa9391e6f23",
      "https://git.kernel.org/stable/c/5afb9317e2eeb1c7021a82995ce244fda5a4bd4f",
      "https://git.kernel.org/stable/c/d0090baf02dd08f6e909f36f0ad54a4e80f5e79b",
      "https://git.kernel.org/stable/c/91c14d6c13096091c56304120aaa26e479130b8b"
    ]
    Environment requirements changed

    before

    [
      {
        "source": "Linux",
        "statements": [
          {
            "nodes": [
              {
                "operator": "OR",
                "negate": false,
                "cpeMatch": [
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "4.17",
                    "versionEndExcluding": "5.10.273"
                  },
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "4.17",
                    "versionEndExcluding": "5.15.224"
                  },
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "4.17",
                    "versionEndExcluding": "6.1.191"
                  },
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "4.17",
                    "versionEndExcluding": "6.6.161"
                  },
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "4.17",
                    "versionEndExcluding": "6.12.115"
                  },
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "4.17",
                    "versionEndExcluding": "6.18.60"
                  },
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "4.17",
                    "versionEndExcluding": "7.2.14"
                  },
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "4.17",
                    "versionEndExcluding": "7.3.1"
                  }
                ]
              }
            ]
          }
        ]
      }
    ]

    after

    [
      {
        "source": "Linux",
        "statements": [
          {
            "nodes": [
              {
                "operator": "OR",
                "negate": false,
                "cpeMatch": [
                  {
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                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "4.17",
                    "versionEndExcluding": "5.10.273"
                  },
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "4.17",
                    "versionEndExcluding": "5.15.224"
                  },
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "4.17",
                    "versionEndExcluding": "6.1.191"
                  },
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "4.17",
                    "versionEndExcluding": "6.6.161"
                  },
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "4.17",
                    "versionEndExcluding": "6.12.115"
                  },
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "4.17",
                    "versionEndExcluding": "6.18.60"
                  },
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "4.17",
                    "versionEndExcluding": "7.2.14"
                  },
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "4.17",
                    "versionEndExcluding": "7.3.1"
                  },
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "4.17",
                    "versionEndExcluding": "7.4-rc1"
                  }
                ]
              }
            ]
          }
        ]
      }
    ]

Large field values are marked as truncated previews. Original source snapshots remain retained.

Showing up to 50 most recent observed changes.