Vulnerability Description
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]
CVSS Score
HIGH
References
- https://git.kernel.org/stable/c/7a03413f31c196ab3894f988cdce0bb47b4fec42
- https://git.kernel.org/stable/c/7ce010275c531475f9d6e7efb11b9e522c74ed2e
- https://git.kernel.org/stable/c/ce12e1170c0c78dffb9b28af6d287492ae7dd99d
- https://git.kernel.org/stable/c/e593031ff19a9484e8a00bc47edd447187721846
- https://git.kernel.org/stable/c/fa091f46c3833fb22384f10eade2b4e1e1d0b278
FAQ
What is CVE-2026-74753?
CVE-2026-74753 is a vulnerability with a CVSS score of 7.8 (HIGH). 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 ...
How severe is CVE-2026-74753?
CVE-2026-74753 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-74753?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.