CVE-2026-74753
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]
How to fix
- Linux Linuxce12e1170c0c78dffb9b28af6d287492ae7dd99d, e593031ff19a9484e8a00bc47edd447187721846, 7a03413f31c196ab3894f988cdce0bb47b4fec42, 7ce010275c531475f9d6e7efb11b9e522c74ed2e, fa091f46c3833fb22384f10eade2b4e1e1d0b278, 6.2, 6.6.156, 6.12.108, 6.18.46, 7.1.10 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 4cdb1b3ab96eb1b7eb70bc5c82fede334bd60df2 ≤ v < ce12e1170c0c78dffb9b28af6d287492ae7dd99d, 39358e856fb89e62e3c8d7389a2dc4ec33dbe90e ≤ v < e593031ff19a9484e8a00bc47edd447187721846, a2d5d3ee7b6e3953114726b1521e62123ab5b043 ≤ v < 7a03413f31c196ab3894f988cdce0bb47b4fec42, 06ccef0434e98058ddae7bcebc901f93d22b7653 ≤ v < 7ce010275c531475f9d6e7efb11b9e522c74ed2e, 037a3c43edfb597665dd34457cd22b14692f2ba3 ≤ v < fa091f46c3833fb22384f10eade2b4e1e1d0b278, 1d3e1102273f09180262496658e7eeed8a5a7b59, 6.1.191 ≤ v < 6.2, 6.6.145 ≤ v < 6.6.156, 6.12.96 ≤ v < 6.12.108, 6.18.39 ≤ v < 6.18.46, 7.1.4 ≤ v < 7.1.10 | ce12e1170c0c78dffb9b28af6d287492ae7dd99d, e593031ff19a9484e8a00bc47edd447187721846, 7a03413f31c196ab3894f988cdce0bb47b4fec42, 7ce010275c531475f9d6e7efb11b9e522c74ed2e, fa091f46c3833fb22384f10eade2b4e1e1d0b278, 6.2, 6.6.156, 6.12.108, 6.18.46, 7.1.10 |
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