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CVE-2026-99235

tracing: Save the event file instead of the compatible histogram

Products / packages Linux

Published

Share

Severity and exploitation

Not in CISA KEV

KEV coverage does not rule out exploitation.

KEV checked 06/11/2026, 21:10:31 UTC
Linux · CVSS:3.1 · 7.8
Assessment vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Severity

high7.8

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

The Linux kernel has a vulnerability where the create_field_var_hist function saves a pointer to a compatible histogram, which can be freed while still in use, leading to a use-after-free error. The affected versions are Linux kernel versions starting from 4.17. The vulnerability requires access to the kernel's tracing system.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

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 a6165126b1a1b26342b55be6eb6ee23af8756aba

git versions

02205a6752f223779a1b0e9e8ffacbea6e717851 → before 173914501b97236d7ea7dc2af7f30feddd4e1436

git versions

02205a6752f223779a1b0e9e8ffacbea6e717851 → before ac815a379644b2ad5008a009a3516ada31b5dd82

git versions

02205a6752f223779a1b0e9e8ffacbea6e717851 → before 8b307d64a60548e4a74cb746f74d7ed4bd49965e

git versions

02205a6752f223779a1b0e9e8ffacbea6e717851 → before 7a111ba0d1b74c99bc8f096565dc71945f694254

git versions

02205a6752f223779a1b0e9e8ffacbea6e717851 → before 3609ada3c12cecfb0ae5ee82ef4f86c5f18a2dea

git versions

02205a6752f223779a1b0e9e8ffacbea6e717851 → before 9631dbccd3c649b567a5aafffea6b00634183997

git versions

02205a6752f223779a1b0e9e8ffacbea6e717851 → before 7cafc82e6153f05a221be678cd649d02e06ba909

git versions

02205a6752f223779a1b0e9e8ffacbea6e717851 → before d5c42664fc094899af9aae5300b27fe8fdb658ef

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: Save the event file instead of the compatible histogram

create_field_var_hist() creates a histogram on the matched event to supply a field variable, and records it on the target so it can be torn down later:

hist_data = find_compatible_hist(target_hist_data, file);
...
/* Save the compatible histogram information */
var_hist->hist_data = hist_data;

hist_data is not the histogram it creates. It is one that was already there, whose keys the new one copies. The saved pointer has a single user, unregister_field_var_hists(), which runs when the target is removed:

file = hist_data->field_var_hists[i]->hist_data->event_file;

find_compatible_hist() matches on keys alone, so it can pick one with no variables of its own. check_var_refs() then returns false and the user can remove it while the target still points at it:

BUG: KASAN: slab-use-after-free in event_hist_trigger_free+0x2b2/0x320 Read of size 8 at addr ffff8880093b90e0 by task init/1

Freed by task 1: kfree+0x154/0x420 event_hist_trigger_free+0x1d5/0x320 event_hist_trigger_parse+0x35f3/0x69e0 trigger_process_regex+0x1a6/0x250

Save the event file instead. It is all the dereference ever wanted, and it does not go away when the user removes a trigger.

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-2026-99235

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-2026-99235

    Observed 2026-11-03T19:50:42.535Z · upstream updated 2026-11-03T19:13:03.627Z

    Product or version evidence changed

    before

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        "name": "Linux",
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          {
            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
            "status": "affected",
            "lessThan": "a6165126b1a1b26342b55be6eb6ee23af8756aba",
            "versionType": "git"
          },
          {
            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
            "status": "affected",
            "lessThan": "173914501b97236d7ea7dc2af7f30feddd4e1436",
            "versionType": "git"
          },
          {
            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
            "status": "affected",
            "lessThan": "ac815a379644b2ad5008a009a3516ada31b5dd82",
            "versionType": "git"
          },
          {
            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
            "status": "affected",
            "lessThan": "8b307d64a60548e4a74cb746f74d7ed4bd49965e",
            "versionType": "git"
          },
          {
            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
            "status": "affected",
            "lessThan": "7a111ba0d1b74c99bc8f096565dc71945f694254",
            "versionType": "git"
          },
          {
            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
            "status": "affected",
            "lessThan": "3609ada3c12cecfb0ae5ee82ef4f86c5f18a2dea",
            "versionType": "git"
          },
          {
            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
            "status": "affected",
            "lessThan": "9631dbccd3c649b567a5aafffea6b00634183997",
            "versionType": "git"
          },
          {
            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
            "status": "affected",
            "lessThan": "7cafc82e6153f05a221be678cd649d02e06ba909",
            "versionType": "git"
          }
        ],
        "defaultStatus": "unaffected",
        "cpes": [],
        "source": "Linux",
        "url": "https://www.cve.org/CVERecord?id=CVE-2026-99235"
      },
      {
        "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-2026-99235"
      }
    ]

    after

    [
      {
        "vendor": "Linux",
        "name": "Linux",
        "platforms": [],
        "versions": [
          {
            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
            "status": "affected",
            "lessThan": "a6165126b1a1b26342b55be6eb6ee23af8756aba",
            "versionType": "git"
          },
          {
            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
            "status": "affected",
            "lessThan": "173914501b97236d7ea7dc2af7f30feddd4e1436",
            "versionType": "git"
          },
          {
            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
            "status": "affected",
            "lessThan": "ac815a379644b2ad5008a009a3516ada31b5dd82",
            "versionType": "git"
          },
          {
            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
            "status": "affected",
            "lessThan": "8b307d64a60548e4a74cb746f74d7ed4bd49965e",
            "versionType": "git"
          },
          {
            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
            "status": "affected",
            "lessThan": "7a111ba0d1b74c99bc8f096565dc71945f694254",
            "versionType": "git"
          },
          {
            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
            "status": "affected",
            "lessThan": "3609ada3c12cecfb0ae5ee82ef4f86c5f18a2dea",
            "versionType": "git"
          },
          {
            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
            "status": "affected",
            "lessThan": "9631dbccd3c649b567a5aafffea6b00634183997",
            "versionType": "git"
          },
          {
            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
            "status": "affected",
            "lessThan": "7cafc82e6153f05a221be678cd649d02e06ba909",
            "versionType": "git"
          },
          {
            "version": "02205a6752f223779a1b0e9e8ffacbea6e717851",
            "status": "affected",
            "lessThan": "d5c42664fc094899af9aae5300b27fe8fdb658ef",
            "versionType": "git"
          }
        ],
        "defaultStatus": "unaffected",
        "cpes": [],
        "source": "Linux",
        "url": "https://www.cve.org/CVERecord?id=CVE-2026-99235"
      },
      {
        "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",
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      }
    ]
    References changed

    before

    [
      "https://git.kernel.org/stable/c/a6165126b1a1b26342b55be6eb6ee23af8756aba",
      "https://git.kernel.org/stable/c/173914501b97236d7ea7dc2af7f30feddd4e1436",
      "https://git.kernel.org/stable/c/ac815a379644b2ad5008a009a3516ada31b5dd82",
      "https://git.kernel.org/stable/c/8b307d64a60548e4a74cb746f74d7ed4bd49965e",
      "https://git.kernel.org/stable/c/7a111ba0d1b74c99bc8f096565dc71945f694254",
      "https://git.kernel.org/stable/c/3609ada3c12cecfb0ae5ee82ef4f86c5f18a2dea",
      "https://git.kernel.org/stable/c/9631dbccd3c649b567a5aafffea6b00634183997",
      "https://git.kernel.org/stable/c/7cafc82e6153f05a221be678cd649d02e06ba909"
    ]

    after

    [
      "https://git.kernel.org/stable/c/a6165126b1a1b26342b55be6eb6ee23af8756aba",
      "https://git.kernel.org/stable/c/173914501b97236d7ea7dc2af7f30feddd4e1436",
      "https://git.kernel.org/stable/c/ac815a379644b2ad5008a009a3516ada31b5dd82",
      "https://git.kernel.org/stable/c/8b307d64a60548e4a74cb746f74d7ed4bd49965e",
      "https://git.kernel.org/stable/c/7a111ba0d1b74c99bc8f096565dc71945f694254",
      "https://git.kernel.org/stable/c/3609ada3c12cecfb0ae5ee82ef4f86c5f18a2dea",
      "https://git.kernel.org/stable/c/9631dbccd3c649b567a5aafffea6b00634183997",
      "https://git.kernel.org/stable/c/7cafc82e6153f05a221be678cd649d02e06ba909",
      "https://git.kernel.org/stable/c/d5c42664fc094899af9aae5300b27fe8fdb658ef"
    ]
    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": [
                  {
                    "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"
                  }
                ]
              }
            ]
          }
        ]
      }
    ]

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

Showing up to 50 most recent observed changes.