CVE-2026-53334 is a vulnerability in Linux Kernel
Published on July 1, 2026
mm/damon/reclaim: handle ctx allocation failure
In 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.
Products Associated with CVE-2026-53334
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Affected Versions
Linux:- Version 3f7a914ab9a5e46cf8aac7de270f02aa3f63de04 and below 66bc00ea37fa8ec14be5a3909d067a5967ef234b is affected.
- Version 3f7a914ab9a5e46cf8aac7de270f02aa3f63de04 and below 635b45ce61de53a9357e28ac97461428cdb650f0 is affected.
- Version 3f7a914ab9a5e46cf8aac7de270f02aa3f63de04 and below 7e2ed8a29427af534bf2cb9b8bc51762b8b6e654 is affected.
- Version 6.18 is affected.
- Before 6.18 is unaffected.
- Version 6.18.36, <= 6.18.* is unaffected.
- Version 7.0.13, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.