Bug 2461564 (CVE-2026-31653)

Summary: CVE-2026-31653 kernel: mm/damon/sysfs: dealloc repeat_call_control if damon_call() fails
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's Data Access MONitor (DAMON) subsystem. When a process being monitored by DAMON terminates unexpectedly, a memory leak can occur because a control structure is not properly deallocated. This can lead to a gradual consumption of system memory, potentially causing system instability or a Denial of Service (DoS) over an extended period.
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Description OSIDB Bzimport 2026-04-24 15:08:42 UTC 
In the Linux kernel, the following vulnerability has been resolved:

mm/damon/sysfs: dealloc repeat_call_control if damon_call() fails

damon_call() for repeat_call_control of DAMON_SYSFS could fail if somehow
the kdamond is stopped before the damon_call().  It could happen, for
example, when te damon context was made for monitroing of a virtual
address processes, and the process is terminated immediately, before the
damon_call() invocation.  In the case, the dyanmically allocated
repeat_call_control is not deallocated and leaked.

Fix the leak by deallocating the repeat_call_control under the
damon_call() failure.

This issue is discovered by sashiko [1].
Comment 1 Keith Grant 2026-04-24 21:59:52 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026042401-CVE-2026-31653-cb56@gregkh/T