Bug 2492753 (CVE-2026-53132)

Summary: CVE-2026-53132 kernel: vsock/virtio: fix potential unbounded skb queue
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in the Linux kernel's vsock/virtio component. A remote attacker could send specially crafted packets with zero length and an End-of-Message (EOM) flag. This could lead to an unbounded queue of packets, consuming excessive memory and potentially causing a Denial of Service (DoS) due to resource exhaustion.
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Description OSIDB Bzimport 2026-06-25 10:03:56 UTC 
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)
Comment 1 TEJ RATHI 2026-06-26 08:11:53 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026062541-CVE-2026-53132-7ab2@gregkh/T