CVE-2023-53305: Bluetooth: L2CAP: Fix use-after-free

Affected versions

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

• linux linux kernelbefore 4.14.324
• linux linux kernel4.15 and later · before 4.19.293
• linux linux kernel4.20 and later · before 5.4.255
• linux linux kernel5.5 and later · before 5.10.192
• linux linux kernel5.11 and later · before 5.15.128
• linux linux kernel5.16 and later · before 6.1.47
• linux linux kernel6.2 and later · before 6.4.12

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

  • 3.14affected
  • 71fb419724fadab4efdf98210aa3fe053bd81d29 and later · before e76bab1b7afa580cd76362540fc37551ada4359baffected · git
  • 71fb419724fadab4efdf98210aa3fe053bd81d29 and later · before 1a40c56e8bff3e424724d78a9a6b3272dd8a371daffected · git
  • 71fb419724fadab4efdf98210aa3fe053bd81d29 and later · before fe49aa73cca6608714477b74bfc6874b9db979dfaffected · git
  • 71fb419724fadab4efdf98210aa3fe053bd81d29 and later · before 2958cf9f805b9f0bdc4a761bf6ea281eb8d44f8eaffected · git
  • 71fb419724fadab4efdf98210aa3fe053bd81d29 and later · before 548a6b64b3c0688f01119a6fcccceb41f8c984e4affected · git
  • 71fb419724fadab4efdf98210aa3fe053bd81d29 and later · before 149daab45922ab1ac7f0cbeacab7251a46bf5e63affected · git
  • 71fb419724fadab4efdf98210aa3fe053bd81d29 and later · before 255be68150291440657b2cdb09420b69441af3d8affected · git
  • 71fb419724fadab4efdf98210aa3fe053bd81d29 and later · before f752a0b334bb95fe9b42ecb511e0864e2768046faffected · git
  • before 3.14not 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-2022-50352Sep 16, 2025 · net: hns: fix possible memory leak in hnae_ae_register()
  22Monitor
• ← EarlierCVE-2023-53304Sep 16, 2025 · netfilter: nft_set_rbtree: fix overlap expiration walk
  22Monitor
• Later →CVE-2023-53306Sep 16, 2025 · fsdax: force clear dirty mark if CoW
  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.