Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 06a8fc78367d070720af960dcecec917d3ae5f3b before d96de882d6b99955604669d962ae14e94b66a551; affected 06a8fc78367d070720af960dcecec917d3ae5f3b before 02f9af192b98d15883c70dd41ac76d1b0217c899; affected 06a8fc78367d070720af960dcecec917d3ae5f3b before d05bc313788f0684b27f0f5b60c52a844669b542; affected 06a8fc78367d070720af960dcecec917d3ae5f3b before ec0f1b3da8061be3173d1c39faaf9504f91942c3; affected 06a8fc78367d070720af960dcecec917d3ae5f3b before 3ef3d52a1a9860d094395c7a3e593f3aa26ff012 |
| Linux / Linux | affected 4.8; unaffected 0 before 4.8; unaffected 6.1.162 through 6.1.*; unaffected 6.6.122 through 6.6.*; unaffected 6.12.68 through 6.12.*; unaffected 6.18.8 through 6.18.*; unaffected 6.19 through * |
CWE
No CWE identifiers supplied.
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
ADP enrichment
No English description supplied.
No references supplied.