CVE-2026-74753

Status: UPDATED  |  Advisory ID: CVE-2026-74753

Key Details

Affected Products, Subsystems & Sectors

What to Know

In the Linux kernel, the following vulnerability has been resolved:

perf: Reject exited events as group leaders

perf_event_remove_on_exec() sets remove-on-exec events to the EXIT state

and detaches their group relationships. The event's file descriptor can

remain open, however, and perf_event_open() currently accepts that event

as a group leader because its early validation rejects only REVOKED and

DEAD events.

A new sibling can consequently be linked to the detached leader. When

the leader is closed, perf_group_detach() observes that its

PERF_ATTACH_GROUP bit is already clear and skips the new sibling. The

sibling then retains a group_leader pointer to the freed event.

Reject group leaders in the EXIT state. Perform the check while holding

the shared context mutex so that an exec in the target task cannot detach

the leader between validation and group attachment.

[peterz: make the earlier test fully consistent] (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References