mm/damon/reclaim: handle ctx allocation failure

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Summary

CVECVE-2026-53334
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-01 14:16:41 UTC
Updated2026-07-01 14:16:41 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: mm/damon/reclaim: handle ctx allocation failure Patch series "mm/damon/{reclaim,lru_sort}: handle ctx allocation failures". DAMON_RECLAIM and DAMON_LRU_SORT could dereference NULL pointers if their damon_ctx object allocations fail. The bugs are expected to happen infrequently because the allocations are arguably too small to fail on common setups. But theoretically they are possible and the consequences are bad. Fix those. The issues were discovered [1] by Sashiko. This patch (of 2): DAMON_RECLAIM allocates the damon_ctx object for its kdamond in its init function. damon_reclaim_enabled_store() wrongly assumes the allocation will always succeed once tried. If the damon_ctx allocation was failed, therefore, code execution reaches to damon_commit_ctx() while 'ctx' is NULL. As a result, it dereferences the NULL 'ctx' pointer. Avoid the NULL dereference by returning -ENOMEM if 'ctx' is NULL.

Risk And Classification

EPSS: 0.001660000 probability, percentile 0.062090000 (date 2026-07-04)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 3f7a914ab9a5e46cf8aac7de270f02aa3f63de04 66bc00ea37fa8ec14be5a3909d067a5967ef234b git Not specified
CNA Linux Linux affected 3f7a914ab9a5e46cf8aac7de270f02aa3f63de04 635b45ce61de53a9357e28ac97461428cdb650f0 git Not specified
CNA Linux Linux affected 3f7a914ab9a5e46cf8aac7de270f02aa3f63de04 7e2ed8a29427af534bf2cb9b8bc51762b8b6e654 git Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 semver Not specified
CNA Linux Linux unaffected 6.18.36 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.13 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/635b45ce61de53a9357e28ac97461428cdb650f0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/66bc00ea37fa8ec14be5a3909d067a5967ef234b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7e2ed8a29427af534bf2cb9b8bc51762b8b6e654 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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