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  4. CVE 2026 99237 tracing hold tracetypeslock when resetting last
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Back to active CVEs
High · CVSS 7.8CVE-2026-99237

tracing: Hold trace_types_lock when resetting last boot data from readersCVE-2026-99237

Answer in brief

CVE-2026-99237 records a High severity (CVSS 7.8) vulnerability in tracing: Hold trace_types_lock when resetting last boot data from readers. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 2, 2026Updated Nov 2, 2026Source checked Nov 2, 2026First seen by HOL Nov 2, 2026Material review Nov 2, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.8
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Linux/Linuxgeneric>=32dc0042528d385d83bf458e4cf3a49c5110afea <92b69f6db640dadc0851762ee2e12db99f083cad || >=32dc0042528d385d83bf458e4cf3a49c5110afea <d6d991afe775ab7fcf89523a2502b7ca3be56ffd || >=32dc0042528d385d83bf458e4cf3a49c5110afea <1f06cfe0b60a878619d1d8efe1cd0f515b7dc2aa92b69f6db640dadc0851762ee2e12db99f083cad, d6d991afe775ab7fcf89523a2502b7ca3be56ffd, 1f06cfe0b60a878619d1d8efe1cd0f515b7dc2aa
Linux/Linuxgeneric6.16Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
  2. 2Review the reported fix. Update Linux/Linux to 92b69f6db640dadc0851762ee2e12db99f083cad if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 2, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 2, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 2, 2026

Sources and claim methodology

  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
Upstream source description

In the Linux kernel, the following vulnerability has been resolved: tracing: Hold trace_types_lock when resetting last boot data from readers update_last_data_if_empty() is called from tracing_open() with O_TRUNC, tracing_read_pipe() and tracing_buffers_read() without trace_types_lock. Two readers can both pass the LAST_BOOT test and free module_delta twice, and a module notifier can update module_delta while it is being freed. Take trace_types_lock in those paths and keep the callers that already hold it on an unlocked variant.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
Not reported
Source
CVE List V5
Source checked
Nov 2, 2026
References
3 linked sources
Open source record