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CVE-2026-99237

tracing: Hold trace_types_lock when resetting last boot data from readers

No exploitation reported by the sources we read.

  • Published2026-11-02

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-11-0216:06CVE publishedCNA

Observed activity

isMalicious corpus · updated 2026-11-02 15:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-99237?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-99237?format=csv
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Versions per branch

Products declared by the CNA

As Linux, the CNA that assigned this CVE, declared them in the CVE record; versions as written. NVD lists no product for this CVE yet: this is the only product data so far.

  • Linuxother versions: not affected

    https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

    Affected
    • ≥ 32dc0042528d385d83bf458e4cf3a49c5110afea, < 92b69f6db640dadc0851762ee2e12db99f083cadfixed in 92b69f6db640dadc0851762ee2e12db99f083cadgit
    • ≥ 32dc0042528d385d83bf458e4cf3a49c5110afea, < d6d991afe775ab7fcf89523a2502b7ca3be56ffdfixed in d6d991afe775ab7fcf89523a2502b7ca3be56ffdgit
    • ≥ 32dc0042528d385d83bf458e4cf3a49c5110afea, < 1f06cfe0b60a878619d1d8efe1cd0f515b7dc2aafixed in 1f06cfe0b60a878619d1d8efe1cd0f515b7dc2aagit
  • Linuxother versions: affected

    https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

    Affected
    • = 6.16no fix stated

    Not affected < 6.16 · ≥ 6.18.60, ≤ 6.18.* · ≥ 7.2.14, ≤ 7.2.* · ≥ 7.3.1, ≤ 7.3.*

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-02

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2026-99237 yet.

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE record2026-11-02
  • CNACVSS 3.17.82026-11-02

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2026-11-02

Frequently asked questions

What is CVE-2026-99237?

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.

Is CVE-2026-99237 actively exploited?

Active exploitation of CVE-2026-99237 has not been confirmed.

What is the CVSS score for CVE-2026-99237?

CVE-2026-99237 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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