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CVE-2026-23069

Estado: AnalizadaMedia (5.5)—

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:

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]

Detalles técnicos trazas, registros y código del informe original
  ret = vvs->peer_buf_alloc - (vvs->tx_cnt - vvs->peer_fwd_cnt);

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvsock/virtio: fix potential underflow in virtio_transport_get_credit()\n\nThe credit calculation in virtio_transport_get_credit() uses unsigned\narithmetic:\n\n  ret = vvs->peer_buf_alloc - (vvs->tx_cnt - vvs->peer_fwd_cnt);\n\nIf the peer shrinks its advertised buffer (peer_buf_alloc) while bytes\nare in flight, the subtraction can underflow and produce a large\npositive value, potentially allowing more data to be queued than the\npeer can handle.\n\nReuse virtio_transport_has_space() which already handles this case and\nadd a comment to make it clear why we are doing that.\n\n[Stefano: use virtio_transport_has_space() instead of duplicating the code]\n[Stefano: tweak the commit message]"
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