Investigate in your agent.

Turn this advisory into a focused investigation. Ask your agent to check your project’s versions, explain the evidence, and suggest a compatible fix.

Your agent needs remote MCP support and access to https://cve.new/mcp.

Read the setup guide

Skip to content
cve.newCreate a CVE report
Check your stack
CVE-2026-99233

tracing/histograms: Verify event_call identity when updating synth_event refcount

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

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

7 ranges
Linux version evidence

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

affected

4b147936fa509650beaf638b331573c23ba4d609 → before 381f543ed35c434d5b707369aa5dcd69ecf440af

git versions

4b147936fa509650beaf638b331573c23ba4d609 → before 4472579bd1c83708b6fe623c870cdf728e947205

git versions

4b147936fa509650beaf638b331573c23ba4d609 → before 23b4106e8b35823acc79e206c7745f55b9cfd78b

git versions

4b147936fa509650beaf638b331573c23ba4d609 → before 06e816bed499fe47f39f12044382cc5d064485fb

git versions

4b147936fa509650beaf638b331573c23ba4d609 → before 5597bb8db6855fcb97a67196d227fea359bcd81c

git versions

4b147936fa509650beaf638b331573c23ba4d609 → before cf4e31d5da80fae4c9cdbe7af55b7c3ad213f0e4

git versions

4b147936fa509650beaf638b331573c23ba4d609 → before 3403d9bb27ebc3572bd048620746b4414e073bf9

git versions

unaffected

unknown

Other versions: unaffected

Linux · Linux

Linux

9 ranges
Linux version evidence

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

affected

4.17

unaffected

0 → before 4.17

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/histograms: Verify event_call identity when updating synth_event refcount

In event_hist_trigger_parse() and hist_unreg_all(), the histogram registration and unregistration paths look up find_synth_event() using trace_event_name(file->event_call) and adjust se->ref if a match is found.

Because find_synth_event() only compares the event basename, registering or removing a histogram on a non-synthetic trace event whose basename matches a synthetic event erroneously modifies the synthetic event's reference count. If a histogram is registered on the non-synthetic event before the synthetic event is created and removed afterwards, se->ref is decremented without a matching increment, allowing the synthetic event to be freed while an active histogram action still holds a pointer to it.

Introduce find_synth_event_call() to verify that &se->call matches file->event_call before adjusting se->ref.

References

7 sources
git.kernel.org/stable/c/381f543ed35c434d5b707369aa5dcd69ecf440af
Source referenceLinux
git.kernel.org/stable/c/4472579bd1c83708b6fe623c870cdf728e947205
Source referenceLinux
git.kernel.org/stable/c/23b4106e8b35823acc79e206c7745f55b9cfd78b
Source referenceLinux
git.kernel.org/stable/c/06e816bed499fe47f39f12044382cc5d064485fb
Source referenceLinux
git.kernel.org/stable/c/5597bb8db6855fcb97a67196d227fea359bcd81c
Source referenceLinux
git.kernel.org/stable/c/cf4e31d5da80fae4c9cdbe7af55b7c3ad213f0e4
Source referenceLinux
View 1 more references
git.kernel.org/stable/c/3403d9bb27ebc3572bd048620746b4414e073bf9
Source referenceLinux

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-2026-99233

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: 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": "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-2026-99233

    Observed 2026-11-03T19:50:38.321Z · upstream updated 2026-11-03T19:13:02.404Z

    Product or version evidence changed

    before

    [
  {
    "vendor": "Linux",
    "name": "Linux",
    "platforms": [],
    "versions": [
      {
        "version": "4b147936fa509650beaf638b331573c23ba4d609",
        "status": "affected",
        "lessThan": "381f543ed35c434d5b707369aa5dcd69ecf440af",
        "versionType": "git"
      },
      {
        "version": "4b147936fa509650beaf638b331573c23ba4d609",
        "status": "affected",
        "lessThan": "4472579bd1c83708b6fe623c870cdf728e947205",
        "versionType": "git"
      },
      {
        "version": "4b147936fa509650beaf638b331573c23ba4d609",
        "status": "affected",
        "lessThan": "23b4106e8b35823acc79e206c7745f55b9cfd78b",
        "versionType": "git"
      },
      {
        "version": "4b147936fa509650beaf638b331573c23ba4d609",
        "status": "affected",
        "lessThan": "06e816bed499fe47f39f12044382cc5d064485fb",
        "versionType": "git"
      },
      {
        "version": "4b147936fa509650beaf638b331573c23ba4d609",
        "status": "affected",
        "lessThan": "5597bb8db6855fcb97a67196d227fea359bcd81c",
        "versionType": "git"
      },
      {
        "version": "4b147936fa509650beaf638b331573c23ba4d609",
        "status": "affected",
        "lessThan": "cf4e31d5da80fae4c9cdbe7af55b7c3ad213f0e4",
        "versionType": "git"
      }
    ],
    "defaultStatus": "unaffected",
    "cpes": [],
    "source": "Linux",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-99233"
  },
  {
    "vendor": "Linux",
    "name": "Linux",
    "platforms": [],
    "versions": [
      {
        "version": "4.17",
        "status": "affected"
      },
      {
        "version": "0",
        "status": "unaffected",
        "lessThan": "4.17",
        "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-2026-99233"
  }
]

    after

    [
  {
    "vendor": "Linux",
    "name": "Linux",
    "platforms": [],
    "versions": [
      {
        "version": "4b147936fa509650beaf638b331573c23ba4d609",
        "status": "affected",
        "lessThan": "381f543ed35c434d5b707369aa5dcd69ecf440af",
        "versionType": "git"
      },
      {
        "version": "4b147936fa509650beaf638b331573c23ba4d609",
        "status": "affected",
        "lessThan": "4472579bd1c83708b6fe623c870cdf728e947205",
        "versionType": "git"
      },
      {
        "version": "4b147936fa509650beaf638b331573c23ba4d609",
        "status": "affected",
        "lessThan": "23b4106e8b35823acc79e206c7745f55b9cfd78b",
        "versionType": "git"
      },
      {
        "version": "4b147936fa509650beaf638b331573c23ba4d609",
        "status": "affected",
        "lessThan": "06e816bed499fe47f39f12044382cc5d064485fb",
        "versionType": "git"
      },
      {
        "version": "4b147936fa509650beaf638b331573c23ba4d609",
        "status": "affected",
        "lessThan": "5597bb8db6855fcb97a67196d227fea359bcd81c",
        "versionType": "git"
      },
      {
        "version": "4b147936fa509650beaf638b331573c23ba4d609",
        "status": "affected",
        "lessThan": "cf4e31d5da80fae4c9cdbe7af55b7c3ad213f0e4",
        "versionType": "git"
      },
      {
        "version": "4b147936fa509650beaf638b331573c23ba4d609",
        "status": "affected",
        "lessThan": "3403d9bb27ebc3572bd048620746b4414e073bf9",
        "versionType": "git"
      }
    ],
    "defaultStatus": "unaffected",
    "cpes": [],
    "source": "Linux",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-99233"
  },
  {
    "vendor": "Linux",
    "name": "Linux",
    "platforms": [],
    "versions": [
      {
        "version": "4.17",
        "status": "affected"
      },
      {
        "version": "0",
        "status": "unaffected",
        "lessThan": "4.17",
        "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-2026-99233"
  }
]
    References changed

    before

    [
  "https://git.kernel.org/stable/c/381f543ed35c434d5b707369aa5dcd69ecf440af",
  "https://git.kernel.org/stable/c/4472579bd1c83708b6fe623c870cdf728e947205",
  "https://git.kernel.org/stable/c/23b4106e8b35823acc79e206c7745f55b9cfd78b",
  "https://git.kernel.org/stable/c/06e816bed499fe47f39f12044382cc5d064485fb",
  "https://git.kernel.org/stable/c/5597bb8db6855fcb97a67196d227fea359bcd81c",
  "https://git.kernel.org/stable/c/cf4e31d5da80fae4c9cdbe7af55b7c3ad213f0e4"
]

    after

    [
  "https://git.kernel.org/stable/c/381f543ed35c434d5b707369aa5dcd69ecf440af",
  "https://git.kernel.org/stable/c/4472579bd1c83708b6fe623c870cdf728e947205",
  "https://git.kernel.org/stable/c/23b4106e8b35823acc79e206c7745f55b9cfd78b",
  "https://git.kernel.org/stable/c/06e816bed499fe47f39f12044382cc5d064485fb",
  "https://git.kernel.org/stable/c/5597bb8db6855fcb97a67196d227fea359bcd81c",
  "https://git.kernel.org/stable/c/cf4e31d5da80fae4c9cdbe7af55b7c3ad213f0e4",
  "https://git.kernel.org/stable/c/3403d9bb27ebc3572bd048620746b4414e073bf9"
]
    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": "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": "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.