CVE-2026-31533: net/tls: fix use-after-free in -EBUSY error path of tls_do_encryption

Affected versions

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

• linux linux kernel5.15.160 and later · before 5.15.203
• linux linux kernel6.1.84 and later · before 6.1.169
• linux linux kernel6.6.18 and later · before 6.6.135
• linux linux kernel6.7.6 and later · before 6.8
• linux linux kernel6.8.1 and later · before 6.12.82
• linux linux kernel6.13 and later · before 6.18.23
• linux linux kernel6.19 and later · before 6.19.13
• 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

  • ab6397f072e5097f267abf5cb08a8004e6b17694, 6.8affected
  • 3ade391adc584f17b5570fd205de3ad029090368 and later · before 414fc5e5a5aff776c150f1b86770e0a25a35df3aaffected · git
  • cd1bbca03f3c1d845ce274c0d0a66de8e5929f72 and later · before 02f3ecadb23558bbe068e6504118f1b712d4ece0affected · git
  • 13eca403876bbea3716e82cdfe6f1e6febb38754 and later · before 0e43e0a3c94044acc74b8e0927c27972eb5a59e8affected · git
  • 8590541473188741055d27b955db0777569438e3 and later · before aa9facde6c5005205874c37db3fd25799d741bafaffected · git
  • 8590541473188741055d27b955db0777569438e3 and later · before 5d70eb25b41e9b010828cd12818b06a0c3b04412affected · git
  • 8590541473188741055d27b955db0777569438e3 and later · before 2694d408b0e595024e0fc1d64ff9db0358580f74affected · git
  • 8590541473188741055d27b955db0777569438e3 and later · before a9b8b18364fffce4c451e6f6fd218fa4ab646705affected · git
  • 5.15.160 and later · before 5.15.203affected · semver
  • 6.1.84 and later · before 6.1.169affected · 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-2026-31531Apr 23, 2026 · ipv4: nexthop: allocate skb dynamically in rtm_get_nexthop()
  22Monitor
• ← EarlierCVE-2026-31532Apr 23, 2026 · can: raw: fix ro->uniq use-after-free in raw_rcv()
  31Monitor
• Later →CVE-2026-31536Apr 24, 2026 · smb: server: let send_done handle a completion without IB_SEND_SIGNALED
  39Monitor

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.