vsock/virtio: fix potential unbounded skb queue

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Summary

CVECVE-2026-53132
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 09:16:30 UTC
Updated2026-06-30 14:44:27 UTC
DescriptionIn 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)

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

EPSS: 0.001400000 probability, percentile 0.037260000 (date 2026-07-03)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.1HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
3.1CNADECLARED7.1HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 077706165717686a2a6a71405fef036cd5b37ae0 1eca304f97a34ed5e921e1f0e06c8b241f25bf12 git Not specified
CNA Linux Linux affected 077706165717686a2a6a71405fef036cd5b37ae0 9bdc637fde66b63d6cad0caacd034888bb7bf5f5 git Not specified
CNA Linux Linux affected 077706165717686a2a6a71405fef036cd5b37ae0 100d5b2ffdc6468b9e48532641f29e83efdcb63c git Not specified
CNA Linux Linux affected 077706165717686a2a6a71405fef036cd5b37ae0 059b7dbd20a6f0c539a45ddff1573cb8946685b5 git Not specified
CNA Linux Linux affected 5852a2b573f7a3a29df46296e56aa3491e589cdf git Not specified
CNA Linux Linux affected 6.1.63 6.2 semver Not specified
CNA Linux Linux affected 6.3 Not specified
CNA Linux Linux unaffected 6.3 semver Not specified
CNA Linux Linux unaffected 6.12.94 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.36 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.13 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/1eca304f97a34ed5e921e1f0e06c8b241f25bf12 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/059b7dbd20a6f0c539a45ddff1573cb8946685b5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/100d5b2ffdc6468b9e48532641f29e83efdcb63c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9bdc637fde66b63d6cad0caacd034888bb7bf5f5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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