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ReviewHigh

CVE-2026-74637

Linux

In the Linux kernel, the following vulnerability has been resolved: perf/core: Fix group leader use-after-free after sibling detach perf_group_detach() handles leader and sibling detach differently. When the group leader is detached, all siblings are promoted to singleton events and their group_leader pointer is reset to themselves. When a sibling is detached, it is removed from the leader's sibling_list, but its group_leader pointer is left pointing at the old leader. That is harmless when the sibling is being closed and freed immediately, as in the DETACH_DEAD path. It is not safe when th...

CVSS
7.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.08.23
PRIORITY ASSESSMENT

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: perf/core: Fix group leader use-after-free after sibling detach perf_group_detach() handles leader and sibling detach differently. When the group leader is detached, all siblings are promoted to singleton events and their group_leader pointer is reset to themselves. When a sibling is detached, it is removed from the leader's sibling_list, but its group_leader pointer is left pointing at the old leader. That is harmless when the sibling is being closed and freed immediately, as in the DETACH_DEAD path. It is not safe when th...

Affected product and versions

Product
Linux
Affected versions
>= 8a49542c0554af7d0073aac0ee73ee65b807ef34 < 8f867c0e8da4c2303d91adf45acb6b1820966c27, >= 8a49542c0554af7d0073aac0ee73ee65b807ef34 < 8e92e03984364d93e0d5b0acd81c95eca773f034, >= 8a49542c0554af7d0073aac0ee73ee65b807ef34 < f8a07021679aadfb6d63b209207ccc41f26982d1, >= 8a49542c0554af7d0073aac0ee73ee65b807ef34 < 80c6054a4c40a0ffad82acef9f9a0dee108d152a, >= 8a49542c0554af7d0073aac0ee73ee65b807ef34 < b42948f9e0d1ea4dbd5742ce1dfc7688de5d4a35, >= 8a49542c0554af7d0073aac0ee73ee65b807ef34 < a979a642402d0b1f856c7a729b4cb2d92de4cf2f, >= 8a49542c0554af7d0073aac0ee73ee65b807ef34 < 1e7abfeb23c12bf46f6457e4a3e1a1a300d50619, >= 8a49542c0554af7d0073aac0ee73ee65b807ef34 < 42c5ca1f0a288a52878bd72a5595b08261057438, >= e732ebc42aea321ee84514330eb3a675307fcc83, >= 2.6.34.14 < 2.6.35, >= 2.6.35
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux 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
Not available