Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: net/handshake: duplicate handshake cancellations leak socket When a handshake request is cancelled it is removed from the handshake_net->hn_requests list, but it is still present in the handshake_rhashtbl until it is destroyed. If a second cancellation request arrives for the same handshake request, then remove_pending() will return false... and assuming HANDSHAKE_F_REQ_COMPLETED isn't set in req->hr_flags, we'll continue processing through the out_true label, where we put another reference on the sock and a refcount underflow occurs. This can happen for example if a handshake times out - particularly if the SUNRPC client sends the AUTH_TLS probe to the server but doesn't follow it up with the ClientHello due to a problem with tlshd. When the timeout is hit on the server, the server will send a FIN, which triggers a cancellation request via xs_reset_transport(). When the timeout is hit on the client, another cancellation request happens via xs_tls_handshake_sync(). Add a test_and_set_bit(HANDSHAKE_F_REQ_COMPLETED) in the pending cancel path so duplicate cancels can be detected.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 3b3009ea8abb713b022d94fba95ec270cf6e7eae before 011ae80c49d9bfa5b4336f8bd387cd25c7593663; affected 3b3009ea8abb713b022d94fba95ec270cf6e7eae before e1641177e7fb48a0a5a06658d4aab51da6656659; affected 3b3009ea8abb713b022d94fba95ec270cf6e7eae before 3c330f1dee3cd92b57e19b9d21dc8ce5970b09be; affected 3b3009ea8abb713b022d94fba95ec270cf6e7eae before 15564bd67e2975002f2a8e9defee33e321d3183f |
| Linux / Linux | affected 6.4; unaffected 0 before 6.4; unaffected 6.6.120 through 6.6.*; unaffected 6.12.64 through 6.12.*; unaffected 6.18.3 through 6.18.*; unaffected 6.19 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/011ae80c49d9bfa5b4336f8bd387cd25c7593663
- https://git.kernel.org/stable/c/e1641177e7fb48a0a5a06658d4aab51da6656659
- https://git.kernel.org/stable/c/3c330f1dee3cd92b57e19b9d21dc8ce5970b09be
- https://git.kernel.org/stable/c/15564bd67e2975002f2a8e9defee33e321d3183f
ADP enrichment
No English description supplied.
No references supplied.