CVE-2026-64556
perf/core: Detach event groups during remove_on_exec
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
In the Linux kernel, the following vulnerability has been resolved: perf/core: Detach event groups during remove_on_exec perf_event_remove_on_exec() removes events by calling perf_event_exit_event(). For top-level events, this removes the event from the context with DETACH_EXIT only. This can leave inconsistent group state when a removed event is a group leader and the group contains siblings without remove_on_exec. If the group was active, the surviving siblings can remain active and attached to the removed leader's sibling list, but are no longer represented by a valid group leader on the PMU context active lists. A later close of the removed leader uses DETACH_GROUP and can promote the still-active siblings from this stale group state. The next schedule-in can then add an already-linked active_list entry again, corrupting the PMU context active list. With DEBUG_LIST enabled, this is caught as a list_add double-add in merge_sched_in(). Fix this by detaching group relationships when remove_on_exec removes an event. This preserves the existing task-exit and revoke behavior, while ensuring surviving siblings are ungrouped before the removed event leaves the context.
Timeline
ID reserved
By Linux
- 10 days later
· 10 days later
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Awaiting Analysis | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.16% · top 95% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Weakness
Affected products
- affected 2e498d0a74e5b88a6689ae1b811f247f91ff188e – < 1d3e1102273f09180262496658e7eeed8a5a7b59
- affected 2e498d0a74e5b88a6689ae1b811f247f91ff188e – < 4cdb1b3ab96eb1b7eb70bc5c82fede334bd60df2
- affected 2e498d0a74e5b88a6689ae1b811f247f91ff188e – < 39358e856fb89e62e3c8d7389a2dc4ec33dbe90e
- affected 2e498d0a74e5b88a6689ae1b811f247f91ff188e – < a2d5d3ee7b6e3953114726b1521e62123ab5b043
- affected 2e498d0a74e5b88a6689ae1b811f247f91ff188e – < 06ccef0434e98058ddae7bcebc901f93d22b7653
- affected 2e498d0a74e5b88a6689ae1b811f247f91ff188e – < 037a3c43edfb597665dd34457cd22b14692f2ba3
- affected 5.13
- unaffected < 5.13
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.145 – ≤ 6.6.*
- unaffected 6.12.96 – ≤ 6.12.*
- unaffected 6.18.39 – ≤ 6.18.*
- unaffected 7.1.4 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References (6)
- https://git.kernel.org/stable/c/1d3e1102273f09180262496658e7eeed8a5a7b59 (opens in a new tab)
- https://git.kernel.org/stable/c/4cdb1b3ab96eb1b7eb70bc5c82fede334bd60df2 (opens in a new tab)
- https://git.kernel.org/stable/c/39358e856fb89e62e3c8d7389a2dc4ec33dbe90e (opens in a new tab)
- https://git.kernel.org/stable/c/a2d5d3ee7b6e3953114726b1521e62123ab5b043 (opens in a new tab)
- https://git.kernel.org/stable/c/06ccef0434e98058ddae7bcebc901f93d22b7653 (opens in a new tab)
- https://git.kernel.org/stable/c/037a3c43edfb597665dd34457cd22b14692f2ba3 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-64556)Record last updated .