Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: tcp: fix TFO max_qlen accounting across reuseport migration A listener's TCP_FASTOPEN max_qlen stops being accurate and lets through far more pending Fast Open requests than it was configured for. This only shows up with SO_REUSEPORT listener migration, where closing a listener hands its still-pending TFO children over to a surviving one. fastopenq.qlen is charged in tcp_fastopen_create_child() when the child is created and uncharged in reqsk_fastopen_remove() when the handshake completes. The uncharge follows rsk_listener of the request the child points at, and inet_reqsk_clone() has repointed the child at a new request owned by the new listener, so the ++ and the -- land on two different sockets. The new listener's qlen drifts negative and its limit no longer binds. Charge the new listener during migration, like reqsk_queue_migrated() already does for queue->young and queue->qlen.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 54b92e84193749c9968aff2dd46e3b0f42643e18 before e98f0d80b9cccb5f828425d2004f9686e7d1ae24; affected 54b92e84193749c9968aff2dd46e3b0f42643e18 before b6247e0f96bd825ffb2005257f6177b5e642dee6; affected 54b92e84193749c9968aff2dd46e3b0f42643e18 before 585fc5247d14939a561056aa2addd9b7c2b1f670; affected 54b92e84193749c9968aff2dd46e3b0f42643e18 before 6e10ee56524a26b250229ad348637825646ddb88; affected 54b92e84193749c9968aff2dd46e3b0f42643e18 before a66e869cf0c90c1e47ae75f72b6482acbfc808ff; affected 54b92e84193749c9968aff2dd46e3b0f42643e18 before d974618b2097453778389d385e3741629c40e0a3; affected 54b92e84193749c9968aff2dd46e3b0f42643e18 before a0ab2ba83e35159d81cec830a92e885ecf8139be |
| Linux / Linux | affected 5.14; unaffected 0 before 5.14; unaffected 5.15.216 through 5.15.*; unaffected 6.1.183 through 6.1.*; unaffected 6.6.152 through 6.6.*; unaffected 6.12.104 through 6.12.*; unaffected 6.18.45 through 6.18.*; unaffected 7.1.9 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/e98f0d80b9cccb5f828425d2004f9686e7d1ae24
- https://git.kernel.org/stable/c/b6247e0f96bd825ffb2005257f6177b5e642dee6
- https://git.kernel.org/stable/c/585fc5247d14939a561056aa2addd9b7c2b1f670
- https://git.kernel.org/stable/c/6e10ee56524a26b250229ad348637825646ddb88
- https://git.kernel.org/stable/c/a66e869cf0c90c1e47ae75f72b6482acbfc808ff
- https://git.kernel.org/stable/c/d974618b2097453778389d385e3741629c40e0a3
- https://git.kernel.org/stable/c/a0ab2ba83e35159d81cec830a92e885ecf8139be
ADP enrichment
No English description supplied.
No references supplied.