CVE-2026-53381: virtiofs: fix UAF on submount umount

Affected versions

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

• linux linux kernel5.10.246 and later · before 5.10.260
• linux linux kernel5.15.196 and later · before 5.15.211
• linux linux kernel6.1.158 and later · before 6.1.177
• linux linux kernel6.6.115 and later · before 6.6.144
• linux linux kernel6.12.54 and later · before 6.12.95
• linux linux kernel6.17.4 and later · before 6.18.37
• linux linux kernel6.19 and later · before 7.0.14
• linux linux kernel7.1 and later · before 7.1.2

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

  • f19a1390af448d9e193c08e28ea5f727bf3c3049, 6.18affected
  • 548e1f2bac1d4df91a6138f26bb4ab00323fd948 and later · before 607a1d4c42f649e6197567c0448fd9ebb316cd42affected · git
  • cfd1aa3e2b71f3327cb373c45a897c9028c62b35 and later · before 1cc0e3a0c6499aaaa2f21a4fcbba388486afb25eaffected · git
  • 83b375c6efef69b1066ad2d79601221e7892745a and later · before 0b809199ff87c44487e516a725dd4be2185712ceaffected · git
  • bfd17b6138df0122a95989457d8e18ce0b86165e and later · before 2181a09ba980f142650fb053666350ead4471cfeaffected · git
  • b26923512dbe57ae4917bafd31396d22a9d1691a and later · before 97c4691653d145dcc699eca5d3aba3219a520f1faffected · git
  • 26e5c67deb2e1f42a951f022fdf5b9f7eb747b01 and later · before 2abfd3ffbd9452f72535d96ff3982b3ab1f8f2f9affected · git
  • 26e5c67deb2e1f42a951f022fdf5b9f7eb747b01 and later · before 39a2b95e008665c14f84e50ed411d898df7cd11baffected · git
  • 26e5c67deb2e1f42a951f022fdf5b9f7eb747b01 and later · before e09412a714bcd49375198427bb4aa005037a9d6faffected · git
  • 26e5c67deb2e1f42a951f022fdf5b9f7eb747b01 and later · before 06b41351779e9289e8785694ade9042ae85e41eaaffected · 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-2026-53377Jul 19, 2026 · drm/msm: always recover the gpu
  22Monitor
• ← EarlierCVE-2026-53378Jul 19, 2026 · drm/colorop: Fix blob property reference tracking in state lifecycle
  22Monitor
• Later →CVE-2026-53384Jul 19, 2026 · serial: 8250_dw: unregister 8250 port if clk_notifier_register() fails
  39Monitor

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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.