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 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]

The following products are affected by CVE-2026-23069 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-23069.

URL	Resource
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
https://lore.kernel.org/linux-cve-announce/2026020417-CVE-2026-23069-d026@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2026-23069
https://www.cve.org/CVERecord?id=CVE-2026-23069