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Review reviewHigh

CVE-2024-46845

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: tracing/timerlat: Only clear timer if a kthread exists The timerlat tracer can use user space threads to check for osnoise and timer latency. If the program using this is killed via a SIGTERM, the threads are shutdown one at a time and another tracing instance can start up resetting the threads before they are fully closed. That causes the hrtimer assigned to the kthread to be shutdown and freed twice when the dying thread finally closes the file descriptors, causing a use-after-free bug. Only cancel the hrtimer if the asso...

CVSS
7.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2024.09.27
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: tracing/timerlat: Only clear timer if a kthread exists The timerlat tracer can use user space threads to check for osnoise and timer latency. If the program using this is killed via a SIGTERM, the threads are shutdown one at a time and another tracing instance can start up resetting the threads before they are fully closed. That causes the hrtimer assigned to the kthread to be shutdown and freed twice when the dying thread finally closes the file descriptors, causing a use-after-free bug. Only cancel the hrtimer if the asso...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= e88ed227f639ebcb31ed4e5b88756b47d904584b < 8c72f0b2c45f21cb8b00fc37f79f632d7e46c2ed, >= e88ed227f639ebcb31ed4e5b88756b47d904584b < 8a9d0d405159e9c796ddf771f7cff691c1a2bc1e, >= e88ed227f639ebcb31ed4e5b88756b47d904584b < e6a53481da292d970d1edf0d8831121d1c5e2f0d, >= 6.5, >= 6.5 < 6.6.51, >= 6.7 < 6.10.10, 6.11
Fixed versions
6.6.51, 6.10.10

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416