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VulnerabilityPublished

CVE-2026-99234: Linux kernel · tracing: Unregister field variable histograms when the command fails

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in f21351d1c4cdcc6a68f03636a407c2af1a5e1e10 : update Linux kernel when convenient.

Data as of 2 Nov 2026, 16:31 UTC

Severity
Low

Rated Low by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in f21351d1c4cdcc6a68f03636a407c2af1a5e1e10, dba0f492703956801149cc70b39d2650a37995c3, d0090baf02dd08f6e909f36f0ad54a4e80f5e79b +5

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 2 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 02205a6752f223779a1b0e9e8ffacbea6e717851, < f21351d1c4cdcc6a68f03636a407c2af1a5e1e10
Fixed in
  • f21351d1c4cdcc6a68f03636a407c2af1a5e1e10
LinuxLinuxAffected
  • ≥ 02205a6752f223779a1b0e9e8ffacbea6e717851, < dba0f492703956801149cc70b39d2650a37995c3
Fixed in
  • dba0f492703956801149cc70b39d2650a37995c3
LinuxLinuxAffected
  • ≥ 02205a6752f223779a1b0e9e8ffacbea6e717851, < d0090baf02dd08f6e909f36f0ad54a4e80f5e79b
Fixed in
  • d0090baf02dd08f6e909f36f0ad54a4e80f5e79b
LinuxLinuxAffected
  • ≥ 02205a6752f223779a1b0e9e8ffacbea6e717851, < aae0ccd7326eef78dcdefffef3d1253e6f0615ca
Fixed in
  • aae0ccd7326eef78dcdefffef3d1253e6f0615ca
LinuxLinuxAffected
  • ≥ 02205a6752f223779a1b0e9e8ffacbea6e717851, < a3d7ffd2409700748a495b645948fef48199206e
Fixed in
  • a3d7ffd2409700748a495b645948fef48199206e
LinuxLinuxAffected
  • ≥ 02205a6752f223779a1b0e9e8ffacbea6e717851, < 431959fc76456cbba539279fe8967aa9391e6f23
Fixed in
  • 431959fc76456cbba539279fe8967aa9391e6f23

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix is available and has been applied in specific Linux kernel commits identified by their hashes. Users should update to a Linux kernel version that includes these fixes to ensure proper cleanup of tracing histogram triggers on command failures. No additional mitigation steps are indicated.

Description

CVE-2026-99234 is a vulnerability in the Linux kernel tracing subsystem where field variable histograms are not properly unregistered when a command fails. This can leave histogram triggers active and counting even though their associated data structures have been freed, potentially causing resource leaks or inconsistent tracing behavior. The issue occurs due to incomplete cleanup in error paths during command parsing and histogram trigger creation.

References

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