CVE-2026-53132

vsock/virtio: fix potential unbounded skb queue

State: Published
Severity: 7.1 High
Published: Jun 25, 2026
Updated: Oct 19, 2026
Reserved: Jun 9, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

vsock/virtio: fix potential unbounded skb queue

virtio_transport_inc_rx_pkt() checks vvs->rx_bytes + len > vvs->buf_alloc.

virtio_transport_recv_enqueue() skips coalescing for packets with VIRTIO_VSOCK_SEQ_EOM.

If fed with packets with len == 0 and VIRTIO_VSOCK_SEQ_EOM, a very large number of packets can be queued because vvs->rx_bytes stays at 0.

Fix this by estimating the skb metadata size:

(Number of skbs in the queue) * SKB_TRUESIZE(0)

Scores

CVSS	Score	Vector	Source
3.1	7.1 High	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H	Linux

Weaknesses

CWE-400 Uncontrolled Resource Consumption

Affected Products

Product	Versions
LinuxLinux	077706165717686a2a6a71405fef036cd5b37ae0 to before 1eca304f97a34ed5e921e1f0e06c8b241f25bf12Affected 077706165717686a2a6a71405fef036cd5b37ae0 to before 9bdc637fde66b63d6cad0caacd034888bb7bf5f5Affected 077706165717686a2a6a71405fef036cd5b37ae0 to before 100d5b2ffdc6468b9e48532641f29e83efdcb63cAffected 077706165717686a2a6a71405fef036cd5b37ae0 to before 059b7dbd20a6f0c539a45ddff1573cb8946685b5Affected 5852a2b573f7a3a29df46296e56aa3491e589cdfAffected 6.1.63 to before 6.2Affected
LinuxLinux	6.3Affected before 6.3Not affected 6.12.94 through 6.12.Not affected 6.18.36 through 6.18.Not affected 7.0.13 through 7.0.*Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

077706165717686a2a6a71405fef036cd5b37ae0 to before 1eca304f97a34ed5e921e1f0e06c8b241f25bf12Affected
077706165717686a2a6a71405fef036cd5b37ae0 to before 9bdc637fde66b63d6cad0caacd034888bb7bf5f5Affected
077706165717686a2a6a71405fef036cd5b37ae0 to before 100d5b2ffdc6468b9e48532641f29e83efdcb63cAffected
077706165717686a2a6a71405fef036cd5b37ae0 to before 059b7dbd20a6f0c539a45ddff1573cb8946685b5Affected
5852a2b573f7a3a29df46296e56aa3491e589cdfAffected
6.1.63 to before 6.2Affected

LinuxLinux

6.3Affected
before 6.3Not affected
6.12.94 through 6.12.*Not affected
6.18.36 through 6.18.*Not affected
7.0.13 through 7.0.*Not affected
7.1 and laterNot affected

References

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