CVE-2022-50496: dm cache: Fix UAF in destroy()

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

• linux linux kernel3.9 and later · before 4.9.337
• linux linux kernel4.10 and later · before 4.14.303
• linux linux kernel4.15 and later · before 4.19.270
• linux linux kernel4.20 and later · before 5.4.229
• linux linux kernel5.5 and later · before 5.10.163
• linux linux kernel5.11 and later · before 5.15.87
• linux linux kernel5.16 and later · before 6.0.18
• linux linux kernel6.1 and later · before 6.1.4

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

• Linux Linux

  • 3.9affected
  • c6b4fcbad044e6fffcc75bba160e720eb8d67d17 and later · before 034cbc8d3b47a56acd89453c29632a9c117de09daffected · git
  • c6b4fcbad044e6fffcc75bba160e720eb8d67d17 and later · before 993406104d2b28fe470126a062ad37a1e21e792eaffected · git
  • c6b4fcbad044e6fffcc75bba160e720eb8d67d17 and later · before 4d20032dd90664de09f2902a7ea49ae2f7771746affected · git
  • c6b4fcbad044e6fffcc75bba160e720eb8d67d17 and later · before 2f097dfac7579fd84ff98eb1d3acd41d53a485f3affected · git
  • c6b4fcbad044e6fffcc75bba160e720eb8d67d17 and later · before 2b17026685a270b2beaf1cdd9857fcedd3505c7eaffected · git
  • c6b4fcbad044e6fffcc75bba160e720eb8d67d17 and later · before d2a0b298ebf83ab6236f66788a3541e91ce75a70affected · git
  • c6b4fcbad044e6fffcc75bba160e720eb8d67d17 and later · before 6ac4f36910764cb510bafc4c3768544f86ca48caaffected · git
  • c6b4fcbad044e6fffcc75bba160e720eb8d67d17 and later · before 6a3e412c2ab131c54945327a7676b006f000a209affected · git
  • c6b4fcbad044e6fffcc75bba160e720eb8d67d17 and later · before 6a459d8edbdbe7b24db42a5a9f21e6aa9e00c2aaaffected · git

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Other highest-scoring records for the same primary product.

• CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
  90Now
• CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
  89Now
• CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
  85Now

Published before and after this one in the same product

• ← EarlierCVE-2022-50491Oct 4, 2025 · coresight: cti: Fix hang in cti_disable_hw()
  22Monitor
• ← EarlierCVE-2022-50492Oct 4, 2025 · drm/msm: fix use-after-free on probe deferral
  31Monitor
• Later →CVE-2022-50499Oct 4, 2025 · media: dvb-core: Fix double free in dvb_register_device()
  31Monitor

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

1free(dev->buf);2/* ... another thread is still running ... */3process(dev->buf);

1lock(&dev->lock);2free(dev->buf);3dev->buf = NULL;4unlock(&dev->lock);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.