Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 3ade391adc584f17b5570fd205de3ad029090368 before 414fc5e5a5aff776c150f1b86770e0a25a35df3a; affected cd1bbca03f3c1d845ce274c0d0a66de8e5929f72 before 02f3ecadb23558bbe068e6504118f1b712d4ece0; affected 13eca403876bbea3716e82cdfe6f1e6febb38754 before 0e43e0a3c94044acc74b8e0927c27972eb5a59e8; affected 8590541473188741055d27b955db0777569438e3 before aa9facde6c5005205874c37db3fd25799d741baf; affected 8590541473188741055d27b955db0777569438e3 before 5d70eb25b41e9b010828cd12818b06a0c3b04412; affected 8590541473188741055d27b955db0777569438e3 before 2694d408b0e595024e0fc1d64ff9db0358580f74; affected 8590541473188741055d27b955db0777569438e3 before a9b8b18364fffce4c451e6f6fd218fa4ab646705; affected ab6397f072e5097f267abf5cb08a8004e6b17694; affected 5.15.160 before 5.15.203; affected 6.1.84 before 6.1.169; affected 6.6.18 before 6.6.135; affected 6.7.6 before 6.8 |
| Linux / Linux | affected 6.8; unaffected 0 before 6.8; unaffected 5.15.203 through 5.15.*; unaffected 6.1.169 through 6.1.*; unaffected 6.6.135 through 6.6.*; unaffected 6.12.82 through 6.12.*; unaffected 6.18.23 through 6.18.*; unaffected 6.19.13 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/414fc5e5a5aff776c150f1b86770e0a25a35df3a
- https://git.kernel.org/stable/c/02f3ecadb23558bbe068e6504118f1b712d4ece0
- https://git.kernel.org/stable/c/0e43e0a3c94044acc74b8e0927c27972eb5a59e8
- https://git.kernel.org/stable/c/aa9facde6c5005205874c37db3fd25799d741baf
- https://git.kernel.org/stable/c/5d70eb25b41e9b010828cd12818b06a0c3b04412
- https://git.kernel.org/stable/c/2694d408b0e595024e0fc1d64ff9db0358580f74
- https://git.kernel.org/stable/c/a9b8b18364fffce4c451e6f6fd218fa4ab646705
ADP enrichment
No English description supplied.
No English description supplied.
No references supplied.