dm cache policy smq: fix missing locks in invalidating cache blocks

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Summary

CVECVE-2026-53062
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:19 UTC
Updated2026-06-24 17:17:19 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: dm cache policy smq: fix missing locks in invalidating cache blocks In passthrough mode, the policy invalidate_mapping operation is called simultaneously from multiple workers, thus it should be protected by a lock. Otherwise, we might end up with data races on the allocated blocks counter, or even use-after-free issues with internal data structures when doing concurrent writes. Note that the existing FIXME in smq_invalidate_mapping() doesn't affect passthrough mode since migration tasks don't exist there, but would need attention if supporting fast device shrinking via suspend/resume without target reloading. Reproduce steps: 1. Create a cache device consisting of 1024 cache entries dmsetup create cmeta --table "0 8192 linear /dev/sdc 0" dmsetup create cdata --table "0 131072 linear /dev/sdc 8192" dmsetup create corig --table "0 262144 linear /dev/sdc 262144" dd if=/dev/zero of=/dev/mapper/cmeta bs=4k count=1 oflag=direct dmsetup create cache --table "0 262144 cache /dev/mapper/cmeta \ /dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writethrough smq 0" 2. Populate the cache, and record the number of cached blocks fio --name=populate --filename=/dev/mapper/cache --rw=randwrite --bs=4k \ --size=64m --direct=1 nr_cached=$(dmsetup status cache | awk '{split($7, a, "/"); print a[1]}') 3. Reload the cache into passthrough mode dmsetup suspend cache dmsetup reload cache --table "0 262144 cache /dev/mapper/cmeta \ /dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 passthrough smq 0" dmsetup resume cache 4. Write to the passthrough cache. By setting multiple jobs with I/O size equal to the cache block size, cache blocks are invalidated concurrently from different workers. fio --filename=/dev/mapper/cache --name=test --rw=randwrite --bs=64k \ --direct=1 --numjobs=2 --randrepeat=0 --size=64m 5. Check if demoted matches cached block count. These numbers should match but may differ due to the data race. nr_demoted=$(dmsetup status cache | awk '{print $12}') echo "$nr_cached, $nr_demoted"

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected b29d4986d0da1a27cd35917cdb433672f5c95d7f 4991b5a08751e2e82488fb93ae08849b6aea10d9 git Not specified
CNA Linux Linux affected b29d4986d0da1a27cd35917cdb433672f5c95d7f 1b2bec4a7dcf5f00b7a1cbeeec8997841d783513 git Not specified
CNA Linux Linux affected b29d4986d0da1a27cd35917cdb433672f5c95d7f 9a5fdfb9e57ec3a8ad2b8fce5e5ffa42d53b130e git Not specified
CNA Linux Linux affected b29d4986d0da1a27cd35917cdb433672f5c95d7f ac5ee99443891bdb161f5539606a66a1b5e72542 git Not specified
CNA Linux Linux affected b29d4986d0da1a27cd35917cdb433672f5c95d7f 93627a29d4b66d4a2def938dfb8610cc80ae454b git Not specified
CNA Linux Linux affected b29d4986d0da1a27cd35917cdb433672f5c95d7f c348ae47d8e65f06429fa41adce9ad986b696766 git Not specified
CNA Linux Linux affected b29d4986d0da1a27cd35917cdb433672f5c95d7f 2b62d0611c9af14a16bddf22df2612b4f40eb5a1 git Not specified
CNA Linux Linux affected b29d4986d0da1a27cd35917cdb433672f5c95d7f 2d1f7b65f5deedd2e6b09fdc6ea27f8375f24b45 git Not specified
CNA Linux Linux affected 4.12 Not specified
CNA Linux Linux unaffected 4.12 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.141 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.91 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/4991b5a08751e2e82488fb93ae08849b6aea10d9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/93627a29d4b66d4a2def938dfb8610cc80ae454b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ac5ee99443891bdb161f5539606a66a1b5e72542 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c348ae47d8e65f06429fa41adce9ad986b696766 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1b2bec4a7dcf5f00b7a1cbeeec8997841d783513 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2d1f7b65f5deedd2e6b09fdc6ea27f8375f24b45 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9a5fdfb9e57ec3a8ad2b8fce5e5ffa42d53b130e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2b62d0611c9af14a16bddf22df2612b4f40eb5a1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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