CVE-2026-31469: virtio_net: Fix UAF on dst_ops when IFF_XMIT_DST_RELEASE is cleared and napi_tx is false

Affected versions

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

• linux linux kernel2.6.26 and later · before 5.10.253
• linux linux kernel5.11 and later · before 5.15.203
• linux linux kernel5.16 and later · before 6.1.168
• linux linux kernel6.2 and later · before 6.6.131
• linux linux kernel6.7 and later · before 6.12.80
• linux linux kernel6.13 and later · before 6.18.21
• linux linux kernel6.19 and later · before 6.19.11
• linux linux kernel7.0

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

  • 2.6.26affected
  • f2fc6a54585a1be6669613a31fbaba2ecbadcd36 and later · before be0e63f3b97bbaf453c542e8a15ba2a536e2ac01affected · git
  • f2fc6a54585a1be6669613a31fbaba2ecbadcd36 and later · before c1ec36cb3768574b916f20d2d7415fd14fa1bf12affected · git
  • f2fc6a54585a1be6669613a31fbaba2ecbadcd36 and later · before 8a4790850e710fd6771e4d2112168ed1dd6c0e54affected · git
  • f2fc6a54585a1be6669613a31fbaba2ecbadcd36 and later · before fedd2e1630cac920844997227ccbe7b26a76375aaffected · git
  • f2fc6a54585a1be6669613a31fbaba2ecbadcd36 and later · before f04733c4dc40c43899c3d1c97afbae5831a3770faffected · git
  • f2fc6a54585a1be6669613a31fbaba2ecbadcd36 and later · before 9a18629f2525781f0f3dda7be72b204e4cf77d08affected · git
  • f2fc6a54585a1be6669613a31fbaba2ecbadcd36 and later · before 63d45077b97bb0e0fe0c75931acbbca7a47af141affected · git
  • f2fc6a54585a1be6669613a31fbaba2ecbadcd36 and later · before ba8bda9a0896746053aa97ac6c3e08168729172caffected · git
  • before 2.6.26not affected · semver

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-2026-31466Apr 22, 2026 · mm/huge_memory: fix folio isn't locked in softleaf_to_folio()
  18Monitor
• ← EarlierCVE-2026-31468Apr 22, 2026 · vfio/pci: Fix double free in dma-buf feature
  31Monitor
• Later →CVE-2026-31470Apr 22, 2026 · virt: tdx-guest: Fix handling of host controlled 'quote' buffer length
  28Monitor

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.