CVE-2026-23069
In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: fix potential underflow in virtio_transport_get_credit() The credit calculati…
Impact
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
| Vendor | Product | Affected versions |
|---|---|---|
| Linux | Linux Kernel | from 4.8 before 6.1.162 from 6.2 before 6.6.122 from 6.7 before 6.12.68 from 6.13 before 6.18.8 Version 6.19 |
Weakness classification
References
- NVD record
- CVE.org record
- https://git.kernel.org/stable/c/02f9af192b98d15883c70dd41ac76d1b0217c899
- https://git.kernel.org/stable/c/3ef3d52a1a9860d094395c7a3e593f3aa26ff012
- https://git.kernel.org/stable/c/d05bc313788f0684b27f0f5b60c52a844669b542
- https://git.kernel.org/stable/c/d96de882d6b99955604669d962ae14e94b66a551
- https://git.kernel.org/stable/c/ec0f1b3da8061be3173d1c39faaf9504f91942c3