Answer in brief
CVE-2026-23069 records a Unknown severity vulnerability in vsock/virtio: fix potential underflow in virtio_transport_get_credit(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=06a8fc78367d070720af960dcecec917d3ae5f3b <d96de882d6b99955604669d962ae14e94b66a551 || >=06a8fc78367d070720af960dcecec917d3ae5f3b <02f9af192b98d15883c70dd41ac76d1b0217c899 || >=06a8fc78367d070720af960dcecec917d3ae5f3b <d05bc313788f0684b27f0f5b60c52a844669b542 || >=06a8fc78367d070720af960dcecec917d3ae5f3b <ec0f1b3da8061be3173d1c39faaf9504f91942c3 || >=06a8fc78367d070720af960dcecec917d3ae5f3b <3ef3d52a1a9860d094395c7a3e593f3aa26ff012 | d96de882d6b99955604669d962ae14e94b66a551, 02f9af192b98d15883c70dd41ac76d1b0217c899, d05bc313788f0684b27f0f5b60c52a844669b542, ec0f1b3da8061be3173d1c39faaf9504f91942c3, 3ef3d52a1a9860d094395c7a3e593f3aa26ff012 |
| Linux/Linuxgeneric | 4.8 | Not reported |
Published upstream
Feb 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 19, 2026
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]
Quoted source text, attributed separately from HOL analysis.