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CVE PROGRAM SOURCE RECORD9.8 Critical

CVE-2026-31533

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

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: net/tls: fix use-after-free in -EBUSY error path of tls_do_encryption The -EBUSY handling in tls_do_encryption(), introduced by commit 859054147318 ("net: tls: handle backlogging of crypto requests"), has a use-after-free due to double cleanup of encrypt_pending and the scatterlist entry. When crypto_aead_encrypt() returns -EBUSY, the request is enqueued to the cryptd backlog and the async callback tls_encrypt_done() will be invoked upon completion. That callback unconditionally restores the scatterlist entry (sge->offset, sge->length) and decrements ctx->encrypt_pending. However, if tls_encrypt_async_wait() returns an error, the synchronous error path in tls_do_encryption() performs the same cleanup again, double-decrementing encrypt_pending and double-restoring the scatterlist. The double-decrement corrupts the encrypt_pending sentinel (initialized to 1), making tls_encrypt_async_wait() permanently skip the wait for pending async callbacks. A subsequent sendmsg can then free the tls_rec via bpf_exec_tx_verdict() while a cryptd callback is still pending, resulting in a use-after-free when the callback fires on the freed record. Fix this by skipping the synchronous cleanup when the -EBUSY async wait returns an error, since the callback has already handled encrypt_pending and sge restoration.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 3ade391adc584f17b5570fd205de3ad029090368 to < 414fc5e5a5aff776c150f1b86770e0a25a35df3aaffected
  • cd1bbca03f3c1d845ce274c0d0a66de8e5929f72 to < 02f3ecadb23558bbe068e6504118f1b712d4ece0affected
  • 13eca403876bbea3716e82cdfe6f1e6febb38754 to < 0e43e0a3c94044acc74b8e0927c27972eb5a59e8affected
  • 8590541473188741055d27b955db0777569438e3 to < aa9facde6c5005205874c37db3fd25799d741bafaffected
  • 8590541473188741055d27b955db0777569438e3 to < 5d70eb25b41e9b010828cd12818b06a0c3b04412affected
  • 8590541473188741055d27b955db0777569438e3 to < 2694d408b0e595024e0fc1d64ff9db0358580f74affected
  • 8590541473188741055d27b955db0777569438e3 to < a9b8b18364fffce4c451e6f6fd218fa4ab646705affected
  • ab6397f072e5097f267abf5cb08a8004e6b17694affected
  • 5.15.160 to < 5.15.203affected
  • 6.1.84 to < 6.1.169affected
  • 6.6.18 to < 6.6.135affected
  • 6.7.6 to < 6.8affected

Linux Linux

Default version status: affected

  • 6.8affected
  • 0 to < 6.8unaffected
  • 5.15.203 to ≤ 5.15.*unaffected
  • 6.1.169 to ≤ 6.1.*unaffected
  • 6.6.135 to ≤ 6.6.*unaffected
  • 6.12.82 to ≤ 6.12.*unaffected
  • 6.18.23 to ≤ 6.18.*unaffected
  • 6.19.13 to ≤ 6.19.*unaffected
  • 7.0 to ≤ *unaffected

References