Bug 2418838 (CVE-2025-40227) - CVE-2025-40227 kernel: mm/damon/sysfs: dealloc commit test ctx always
Summary: CVE-2025-40227 kernel: mm/damon/sysfs: dealloc commit test ctx always
Keywords:
Status: NEW
Alias: CVE-2025-40227
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
unspecified
unspecified
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-12-04 16:03 UTC by OSIDB Bzimport
Modified: 2026-01-06 10:07 UTC (History)
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Description OSIDB Bzimport 2025-12-04 16:03:31 UTC 
In the Linux kernel, the following vulnerability has been resolved:

mm/damon/sysfs: dealloc commit test ctx always

The damon_ctx for testing online DAMON parameters commit inputs is
deallocated only when the test fails.  This means memory is leaked for
every successful online DAMON parameters commit.  Fix the leak by always
deallocating it.
Comment 1 Alexander B 2025-12-05 15:08:27 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025120459-CVE-2025-40227-33a7@gregkh/T
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