vsock/virtio: fix MSG_ZEROCOPY pinned-pages accounting

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Summary

CVECVE-2026-52994
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:10 UTC
Updated2026-06-24 17:17:10 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: vsock/virtio: fix MSG_ZEROCOPY pinned-pages accounting virtio_transport_init_zcopy_skb() uses iter->count as the size argument for msg_zerocopy_realloc(), which in turn passes it to mm_account_pinned_pages() for RLIMIT_MEMLOCK accounting. However, this function is called after virtio_transport_fill_skb() has already consumed the iterator via __zerocopy_sg_from_iter(), so on the last skb, iter->count will be 0, skipping the RLIMIT_MEMLOCK enforcement. Pass pkt_len (the total bytes being sent) as an explicit parameter to virtio_transport_init_zcopy_skb() instead of reading the already-consumed iter->count. This matches TCP and UDP, which both call msg_zerocopy_realloc() with the original message size.

Risk And Classification

EPSS: 0.001730000 probability, percentile 0.070100000 (date 2026-06-29)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 581512a6dc939ef122e49336626ae159f3b8a345 6af1736b5810bc8a4a43a8518530113f5a757dc1 git Not specified
CNA Linux Linux affected 581512a6dc939ef122e49336626ae159f3b8a345 d0117950075f0a9d5944980784c719d8ebcd4bff git Not specified
CNA Linux Linux affected 581512a6dc939ef122e49336626ae159f3b8a345 1cb36e252211506f51095fe7ced8286cc77b4c80 git Not specified
CNA Linux Linux affected 6.7 Not specified
CNA Linux Linux unaffected 6.7 semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/6af1736b5810bc8a4a43a8518530113f5a757dc1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d0117950075f0a9d5944980784c719d8ebcd4bff 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1cb36e252211506f51095fe7ced8286cc77b4c80 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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