Description
In the Linux kernel, the following vulnerability has been resolved: tcp: exclude old ACKs from tcp fast path Exclude old ACKs before SND.UNA from the tcp fast path as well as ACKs after SND.NXT. Such ACKs will fall through to the slow path, where tcp_ack() performs the appropriate validation and challenge ACK handling according to RFC5961 and Commit 3d501dd326fb1c7 ("tcp: do not accept ACK of bytes we never sent"). This prevents old ACKs from being accepted or modifying connection state as part of the fast path before appropriate ACK validation is applied. In particular, this prevents payload carried by a segment with an excessively old ACK from advancing RCV.NXT before the ACK is rejected.
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
31770e34e43d6c8dee129bfee77e56c34e61f0e5 to < 07cacab90290f795bad2e566790f4ba8e84cdf5faffected31770e34e43d6c8dee129bfee77e56c34e61f0e5 to < 6eb9b697f50b73b9684e466c1e97f4ca8e947a59affected31770e34e43d6c8dee129bfee77e56c34e61f0e5 to < b86e1e5a4bbcbbccde8b7a3d3486604b581f6628affected31770e34e43d6c8dee129bfee77e56c34e61f0e5 to < 1c8448db5cf35a13d82b0c9004ffdb49358883e7affected31770e34e43d6c8dee129bfee77e56c34e61f0e5 to < 8309dc2cc360056aa9cd2acfbfc25930798c3b66affected31770e34e43d6c8dee129bfee77e56c34e61f0e5 to < ff037920c688ae6ca1153fec01e90e6782712455affected31770e34e43d6c8dee129bfee77e56c34e61f0e5 to < 8205ac5ddb42a1843fa8d6a8c295b5c7f4f8c6edaffected31770e34e43d6c8dee129bfee77e56c34e61f0e5 to < f81e6c3fb06327bc49cdd6e559845293ba06a704affected
Linux Linux
Default version status: affected
4.14affected0 to < 4.14unaffected5.10.271 to ≤ 5.10.*unaffected5.15.222 to ≤ 5.15.*unaffected6.1.189 to ≤ 6.1.*unaffected6.6.158 to ≤ 6.6.*unaffected6.12.112 to ≤ 6.12.*unaffected6.18.54 to ≤ 6.18.*unaffected7.2.8 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/07cacab90290f795bad2e566790f4ba8e84cdf5f ↗
- https://git.kernel.org/stable/c/6eb9b697f50b73b9684e466c1e97f4ca8e947a59 ↗
- https://git.kernel.org/stable/c/b86e1e5a4bbcbbccde8b7a3d3486604b581f6628 ↗
- https://git.kernel.org/stable/c/1c8448db5cf35a13d82b0c9004ffdb49358883e7 ↗
- https://git.kernel.org/stable/c/8309dc2cc360056aa9cd2acfbfc25930798c3b66 ↗
- https://git.kernel.org/stable/c/ff037920c688ae6ca1153fec01e90e6782712455 ↗
- https://git.kernel.org/stable/c/8205ac5ddb42a1843fa8d6a8c295b5c7f4f8c6ed ↗
- https://git.kernel.org/stable/c/f81e6c3fb06327bc49cdd6e559845293ba06a704 ↗