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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-53062

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

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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: 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"

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

  • b29d4986d0da1a27cd35917cdb433672f5c95d7f to < 4991b5a08751e2e82488fb93ae08849b6aea10d9affected
  • b29d4986d0da1a27cd35917cdb433672f5c95d7f to < 1b2bec4a7dcf5f00b7a1cbeeec8997841d783513affected
  • b29d4986d0da1a27cd35917cdb433672f5c95d7f to < 9a5fdfb9e57ec3a8ad2b8fce5e5ffa42d53b130eaffected
  • b29d4986d0da1a27cd35917cdb433672f5c95d7f to < ac5ee99443891bdb161f5539606a66a1b5e72542affected
  • b29d4986d0da1a27cd35917cdb433672f5c95d7f to < 93627a29d4b66d4a2def938dfb8610cc80ae454baffected
  • b29d4986d0da1a27cd35917cdb433672f5c95d7f to < c348ae47d8e65f06429fa41adce9ad986b696766affected
  • b29d4986d0da1a27cd35917cdb433672f5c95d7f to < 2b62d0611c9af14a16bddf22df2612b4f40eb5a1affected
  • b29d4986d0da1a27cd35917cdb433672f5c95d7f to < 2d1f7b65f5deedd2e6b09fdc6ea27f8375f24b45affected

Linux Linux

Default version status: affected

  • 4.12affected
  • 0 to < 4.12unaffected
  • 5.10.258 to ≤ 5.10.*unaffected
  • 5.15.209 to ≤ 5.15.*unaffected
  • 6.1.175 to ≤ 6.1.*unaffected
  • 6.6.141 to ≤ 6.6.*unaffected
  • 6.12.91 to ≤ 6.12.*unaffected
  • 6.18.33 to ≤ 6.18.*unaffected
  • 7.0.10 to ≤ 7.0.*unaffected
  • 7.1 to ≤ *unaffected

References