Linux Kernel CVE-2026-23069
MEDIUMCVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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3DescriptionNVD
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]
AnalysisAI
An integer underflow in the Linux kernel's vsock/virtio credit calculation allows a local attacker with unprivileged access to cause a denial of service by exhausting system resources when the peer shrinks its advertised buffer while data is in flight. The vulnerability enables more data to be queued than the peer can handle, potentially leading to system instability. …
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RemediationAI
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.
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