PT-2026-65734 · Linux · Linux
CVE-2026-64556
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Published
2026-07-29
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Updated
2026-07-29
None
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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.
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Related Identifiers
Affected Products
Linux