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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-53265

dm cache policy smq: check allocation under invalidate lock

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: dm cache policy smq: check allocation under invalidate lock commit 2d1f7b65f5de ("dm cache policy smq: fix missing locks in invalidating cache blocks") added mq->lock around the destructive part of smq_invalidate_mapping(), but left the e->allocated check outside the critical section. That leaves a check-then-act race. Two concurrent invalidators can both observe e->allocated as true before either of them takes mq->lock. The first invalidator that acquires the lock removes the entry from the queues and hash table and then calls free_entry(), which clears e->allocated and puts the entry back on the free list. The second invalidator can then acquire mq->lock and continue with the stale result of the unlocked check. This can corrupt the SMQ queues or hash table by deleting an entry that is no longer on those structures. It can also hit the allocation check in free_entry() when the same entry is freed again. Move the allocation check under mq->lock so the predicate and the destructive operations are serialized by the same lock.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 4991b5a08751e2e82488fb93ae08849b6aea10d9 to < c242c7af2aecf0b538b8623bdb86b8b441da38d9affected
  • 1b2bec4a7dcf5f00b7a1cbeeec8997841d783513 to < 13da856c86fb8c2ccab95034fd77da1bb2c2a17caffected
  • 9a5fdfb9e57ec3a8ad2b8fce5e5ffa42d53b130e to < d886945fcb0f8c9dc6b39928d7a96c95c587346caffected
  • ac5ee99443891bdb161f5539606a66a1b5e72542 to < b4892561552d671bd8c4da5ebb70e9fbb1ec446eaffected
  • 93627a29d4b66d4a2def938dfb8610cc80ae454b to < 03ffe1112ed88bb3a9bd0b971549bf4d64bfc59aaffected
  • c348ae47d8e65f06429fa41adce9ad986b696766 to < 42ff6774ecd9d7f70d599cb71ff64373a1da4948affected
  • 2b62d0611c9af14a16bddf22df2612b4f40eb5a1 to < c57570fba24016ec25ec046ab44db39143fb7a64affected
  • 2d1f7b65f5deedd2e6b09fdc6ea27f8375f24b45 to < d3f0a606b9f278ece8a0df626ded9c4044071235affected

Linux Linux

Default version status: unaffected

  • 5.10.258 to < 5.10.259affected
  • 5.15.209 to < 5.15.210affected
  • 6.1.175 to < 6.1.176affected
  • 6.6.141 to < 6.6.143affected
  • 6.12.91 to < 6.12.94affected
  • 6.18.33 to < 6.18.36affected
  • 7.0.10 to < 7.0.13affected

References