xsk: clear metadata pointer when no timestamp is requested

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74709
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-22 16:16:45 UTC
Updated2026-08-22 16:16:45 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: xsk: clear metadata pointer when no timestamp is requested User space can change metadata flags after request processing. Rereading them during completion can therefore make the kernel write a timestamp that was not requested when the packet was submitted. Clear the metadata pointer during request processing unless timestamp completion is requested. Completion handling can then use the pointer itself instead of rereading the flags. On the mlx5 multi-packet WQE path metadata is evaluated per batch: xsk_tx_metadata_request() runs only for the descriptor that starts a session, just like the checksum offload that is applied once through the shared WQE. Only that descriptor's pointer is reset, so completion handling can record a timestamp for the other descriptors of the session regardless of their own XDP_TXMD_FLAGS_TIMESTAMP bit. The write stays inside the metadata area; the single-WQE, other zero-copy, and generic paths reset the pointer per descriptor and are unaffected.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ca4419f15abd19ba8be1e109661b60f9f5b6c9f0 0ba2e1eb07a826d021344e2f146b6716c58139eb git Not specified
CNA Linux Linux affected ca4419f15abd19ba8be1e109661b60f9f5b6c9f0 eb4c613d4ebc3f664e70d572b8867ba114a8754e git Not specified
CNA Linux Linux affected ca4419f15abd19ba8be1e109661b60f9f5b6c9f0 9f60a67df8d3c862503bee62bada8e7089cba438 git Not specified
CNA Linux Linux affected d9d736c416c9a85f84e15435ba82a177262e745b git Not specified
CNA Linux Linux affected 6.14.2 6.15 semver Not specified
CNA Linux Linux affected 6.15 Not specified
CNA Linux Linux unaffected 6.15 semver Not specified
CNA Linux Linux unaffected 6.18.45 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.9 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0ba2e1eb07a826d021344e2f146b6716c58139eb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9f60a67df8d3c862503bee62bada8e7089cba438 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/eb4c613d4ebc3f664e70d572b8867ba114a8754e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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