Bug 2433917 (CVE-2026-23014)

Summary:	CVE-2026-23014 kernel: perf: Ensure swevent hrtimer is properly destroyed
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	grannygame.org, rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A use-after-free vulnerability was found in the Linux kernel's perf subsystem. When freeing a software event (swevent), the hrtimer used for sampling may still be active because perf_swevent_cancel_hrtimer() uses hrtimer_try_to_cancel() which can fail if the timer is currently executing. This leaves a dangling reference that can cause a use-after-free when the timer fires after the event structure is freed.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-01-28 15:01:34 UTC

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

perf: Ensure swevent hrtimer is properly destroyed

With the change to hrtimer_try_to_cancel() in
perf_swevent_cancel_hrtimer() it appears possible for the hrtimer to
still be active by the time the event gets freed.

Make sure the event does a full hrtimer_cancel() on the free path by
installing a perf_event::destroy handler.

Comment 1 Jon Moroney 2026-01-28 17:04:44 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026012847-CVE-2026-23014-85e6@gregkh/T

Comment 4 Octavia 2026-02-02 07:34:59 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026012847-CVE-2026-23014-85e6@gregkh/T https://subwaysurferscity.org