CVE-2026-53357: Bluetooth: fix UAF in l2cap_sock_cleanup_listen() vs l2cap_conn_del()

Affected versions

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

• linux linux kernel5.7 and later · before 5.10.259
• linux linux kernel5.11 and later · before 5.15.210
• linux linux kernel5.16 and later · before 6.1.175
• linux linux kernel6.2 and later · before 6.6.142
• linux linux kernel6.7 and later · before 6.12.92
• linux linux kernel6.13 and later · before 6.18.34
• linux linux kernel6.19 and later · before 7.0.11
• linux linux kernel7.1

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

  • 5.7affected
  • 15f02b91056253e8cdc592888f431da0731337b8 and later · before 751de6ec671fe75ad9cf65a0638d2a06b6a5984daffected · git
  • 15f02b91056253e8cdc592888f431da0731337b8 and later · before 407217734835d21d4e0105ebf347860dc1806f88affected · git
  • 15f02b91056253e8cdc592888f431da0731337b8 and later · before 7eebd4c2c86f573af87ff165d08a83432eb0b919affected · git
  • 15f02b91056253e8cdc592888f431da0731337b8 and later · before 5d86d2f1b4d9a508c441d3e45277ae1a73cfed57affected · git
  • 15f02b91056253e8cdc592888f431da0731337b8 and later · before 87c543e2f78d0871f271df92dab98901bbd5b6f5affected · git
  • 15f02b91056253e8cdc592888f431da0731337b8 and later · before added1213395071470a900cc845a042fb51882a6affected · git
  • 15f02b91056253e8cdc592888f431da0731337b8 and later · before a5ca86a6097a8b030ca3226cd300b17ed330f966affected · git
  • 15f02b91056253e8cdc592888f431da0731337b8 and later · before ab1513597c6cf17cd1ad2a21e3b045421b48e022affected · git
  • before 5.7not 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-2026-53354Jul 1, 2026 · arm64: errata: Mitigate TLBI errata on various Arm CPUs
  35Monitor
• ← EarlierCVE-2026-53356Jul 1, 2026 · drm/i915/gem: Fix phys BO pread/pwrite with offset
  31Monitor
• Later →CVE-2026-53358Jul 2, 2026 · Bluetooth: L2CAP: use chan timer to close channels in cleanup_listen()
  35Monitor

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.