Bug 2439872 (CVE-2026-23144)

Summary: CVE-2026-23144 kernel: Linux kernel: Local denial of service and memory leak in DAMON sysfs via 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 flaw was found in the Linux kernel's Data Access MONitor (DAMON) sysfs interface. A local attacker, typically a privileged user, could exploit a cleanup bug during DAMON context setup. If the setup fails after the attrs directory is created, stale sysfs directories are left behind. This can lead to a local denial of service, making the DAMON sysfs interface unusable until a system reboot, and potentially cause a kernel memory leak if repeatedly triggered.
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Description OSIDB Bzimport 2026-02-14 16:02:43 UTC 
In the Linux kernel, the following vulnerability has been resolved:

mm/damon/sysfs: cleanup attrs subdirs on context dir setup failure

When a context DAMON sysfs directory setup is failed after setup of attrs/
directory, subdirectories of attrs/ 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 13:15:02 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026021417-CVE-2026-23144-297b@gregkh/T