In the Linux kernel, the following vulnerability has been resolved: perf: Reject exited events as group leaders perf_event_remove_on_ex…
CVE-2026-74753 · published 26 Aug 2026
How serious is it
- Severity: high, CVSS score 7.8 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2026-74753?
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Who is affected
- Linux Linux: 6.6.145 to < 6.6.156, 6.12.96 to < 6.12.108, 6.18.39 to < 6.18.46, 7.1.4 to < 7.1.10
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
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]
Check your whole app
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References
- git.kernel.org/stable/c/7a03413f31c196ab3894f988cdce0bb47b4fec42
- git.kernel.org/stable/c/7ce010275c531475f9d6e7efb11b9e522c74ed2e
- git.kernel.org/stable/c/ce12e1170c0c78dffb9b28af6d287492ae7dd99d
- git.kernel.org/stable/c/e593031ff19a9484e8a00bc47edd447187721846
- git.kernel.org/stable/c/fa091f46c3833fb22384f10eade2b4e1e1d0b278
Merged from NVD. Last updated 24 Oct 2026. All vulnerabilities · RSS · JSON