vsock/virtio: fix empty payload in tap skb for non-linear buffers

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Summary

CVECVE-2026-46207
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-28 10:16:36 UTC
Updated2026-05-28 13:44:01 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: vsock/virtio: fix empty payload in tap skb for non-linear buffers For non-linear skbs, virtio_transport_build_skb() goes through virtio_transport_copy_nonlinear_skb() to copy the original payload in the new skb to be delivered to the vsockmon tap device. This manually initializes an iov_iter but does not set iov_iter.count. Since the iov_iter is zero-initialized, the copy length is zero and no payload is actually copied to the monitor interface, leaving data un-initialized. Fix this by removing the linear vs non-linear split and using skb_copy_datagram_iter() with iov_iter_kvec() for all cases, as vhost-vsock already does. This handles both linear and non-linear skbs, properly initializes the iov_iter, and removes the now unused virtio_transport_copy_nonlinear_skb(). While touching this code, let's also check the return value of skb_copy_datagram_iter(), even though it's unlikely to fail.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 4b0bf10eb077cb43c09746251ef3608d62c45667 06747f52ab157591cec7e5623a759473b66ef6f6 git Not specified
CNA Linux Linux affected 4b0bf10eb077cb43c09746251ef3608d62c45667 52da6a74ca3de0fcda60301096b71534b3b18641 git Not specified
CNA Linux Linux affected 4b0bf10eb077cb43c09746251ef3608d62c45667 378b131a25bd1a5ee27ca199fe486c299d5350c5 git Not specified
CNA Linux Linux affected 4b0bf10eb077cb43c09746251ef3608d62c45667 3a3e3d90cbc79600544536723911657730759af3 git Not specified
CNA Linux Linux affected 6.7 Not specified
CNA Linux Linux unaffected 6.7 semver Not specified
CNA Linux Linux unaffected 6.12.90 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.32 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.9 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc4 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/52da6a74ca3de0fcda60301096b71534b3b18641 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3a3e3d90cbc79600544536723911657730759af3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/378b131a25bd1a5ee27ca199fe486c299d5350c5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/06747f52ab157591cec7e5623a759473b66ef6f6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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