AZL-77130
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-77130.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/AZL-77130
- Upstream
- Published
- 2026-02-04T17:16:17Z
- Modified
- 2026-08-28T17:46:03Z
- Summary
- CVE-2026-23069 affecting package kernel for versions less than 6.6.126.1-1
- Details
-
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]
- References