Bug 2439869 (CVE-2026-23142)

Summary: CVE-2026-23142 kernel: mm/damon/sysfs-scheme: cleanup access_pattern subdirs on scheme dir setup failure
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A resource leak flaw was found in the Linux kernel's DAMON (Data Access MONitor) sysfs interface. When setting up a DAMOS-scheme directory fails after the access_pattern/ subdirectory has been created, the subdirectories are not properly cleaned up. This leaves the DAMON sysfs interface in a broken state until reboot and causes a memory leak for the unremoved directory structures.
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Description OSIDB Bzimport 2026-02-14 16:02:34 UTC 
In the Linux kernel, the following vulnerability has been resolved:

mm/damon/sysfs-scheme: cleanup access_pattern subdirs on scheme dir setup failure

When a DAMOS-scheme DAMON sysfs directory setup fails after setup of
access_pattern/ directory, subdirectories of access_pattern/ directory are
not cleaned up.  As a result, DAMON sysfs interface is nearly broken until
the system reboots, and the memory for the unremoved directory is leaked.

Cleanup the directories under such failures.
Comment 1 Alexander B 2026-02-16 12:49:52 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026021416-CVE-2026-23142-f91e@gregkh/T