CVE-2026-31408: Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold

Affected versions

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

• linux linux kernel2.6.12.1 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 kernel2.6.12
• 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

  • 2.6.12affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 37e18bc8c9a70d77bd099e2273f328b3bc7f6d0daffected · git
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before d57384e27d1ebf0047e3f00a6e1181b8be9857a2affected · git
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before b0a7da0e3f7442545f071499beb36374714bb9deaffected · git
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 45aaca995e4a7a05b272a58e7ab2fff4f611b8f1affected · git
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 108b81514d8f2535eb16651495cefb2250528db3affected · git
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 7197462e90b8ce15caa1ae15d4bc2bb8cd21b11eaffected · git
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before e76e8f0581ef555eacc11dbb095e602fb30a5361affected · git
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 598dbba9919c5e36c54fe1709b557d64120cb94baffected · git
  • before 2.6.12not 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-2026-31409Apr 6, 2026 · ksmbd: unset conn->binding on failed binding request
  35Monitor
• ← EarlierCVE-2026-31407Apr 6, 2026 · netfilter: conntrack: add missing netlink policy validations
  28Monitor
• Later →CVE-2026-31410Apr 6, 2026 · ksmbd: use volume UUID in FS_OBJECT_ID_INFORMATION
  22Monitor

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.