Description
In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: fix potential underflow in virtio_transport_get_credit() The credit calculation in virtio_transport_get_credit() uses unsigned arithmetic: ret = vvs->peer_buf_alloc - (vvs->tx_cnt - vvs->peer_fwd_cnt); If the peer shrinks its advertised buffer (peer_buf_alloc) while bytes are in flight, the subtraction can underflow and produce a large positive value, potentially allowing more data to be queued than the peer can handle. Reuse virtio_transport_has_space() which already handles this case and add a comment to make it clear why we are doing that. [Stefano: use virtio_transport_has_space() instead of duplicating the code] [Stefano: tweak the commit message]
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
06a8fc78367d070720af960dcecec917d3ae5f3b to < d96de882d6b99955604669d962ae14e94b66a551affected06a8fc78367d070720af960dcecec917d3ae5f3b to < 02f9af192b98d15883c70dd41ac76d1b0217c899affected06a8fc78367d070720af960dcecec917d3ae5f3b to < d05bc313788f0684b27f0f5b60c52a844669b542affected06a8fc78367d070720af960dcecec917d3ae5f3b to < ec0f1b3da8061be3173d1c39faaf9504f91942c3affected06a8fc78367d070720af960dcecec917d3ae5f3b to < 3ef3d52a1a9860d094395c7a3e593f3aa26ff012affected
Linux Linux
Default version status: affected
4.8affected0 to < 4.8unaffected6.1.162 to ≤ 6.1.*unaffected6.6.122 to ≤ 6.6.*unaffected6.12.68 to ≤ 6.12.*unaffected6.18.8 to ≤ 6.18.*unaffected6.19 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/d96de882d6b99955604669d962ae14e94b66a551 ↗
- https://git.kernel.org/stable/c/02f9af192b98d15883c70dd41ac76d1b0217c899 ↗
- https://git.kernel.org/stable/c/d05bc313788f0684b27f0f5b60c52a844669b542 ↗
- https://git.kernel.org/stable/c/ec0f1b3da8061be3173d1c39faaf9504f91942c3 ↗
- https://git.kernel.org/stable/c/3ef3d52a1a9860d094395c7a3e593f3aa26ff012 ↗