PT-2026-65734 · Linux · Linux

CVE-2026-64556 · Publicado 2026-07-29 · Atualizado 2026-07-29

Mitre

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.

Identificadores relacionados

CVE-2026-64556

Produtos afetados

Linux

Referências · 6

• https://git.kernel.org/stable/c/06ccef0434e98058ddae7bcebc901f93d22b7653 · Nota
• https://nvd.nist.gov/vuln/detail/CVE-2026-64556 · Nota de Segurança
• https://git.kernel.org/stable/c/4cdb1b3ab96eb1b7eb70bc5c82fede334bd60df2 · Nota
• https://git.kernel.org/stable/c/39358e856fb89e62e3c8d7389a2dc4ec33dbe90e · Nota
• https://git.kernel.org/stable/c/a2d5d3ee7b6e3953114726b1521e62123ab5b043 · Nota
• https://git.kernel.org/stable/c/037a3c43edfb597665dd34457cd22b14692f2ba3 · Nota