xsk: honor XDP_TX_METADATA in zero-copy path

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-90086
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:16:58 UTC
Updated2026-09-17 17:16:58 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: xsk: honor XDP_TX_METADATA in zero-copy path The zero-copy path reads TX metadata whenever the UMEM has metadata space, even if the descriptor does not set XDP_TX_METADATA. Pass descriptor options through the metadata helpers and ignore metadata unless the option is set. This does not fix the existing per-WQE metadata handling for mlx5 MPWQEs. Only the descriptor that starts a session passes through xsk_tx_metadata_request() and configures offload state shared by the batch. Metadata on descriptors joining an open session is therefore not validated and does not configure its requested offloads. In addition, a non-NULL metadata pointer from such a descriptor is treated as a timestamp completion request even when XDP_TXMD_FLAGS_TIMESTAMP is not set, so its metadata union can be overwritten with an unrequested timestamp. Fixing mixed metadata states within one MPWQE requires a separate change.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 48eb03dd26304c24f03bdbb9382e89c8564e71df 53a5b262d706b572840cbe8feae392538077ee19 git Not specified
CNA Linux Linux affected 48eb03dd26304c24f03bdbb9382e89c8564e71df bf9387488d6394845076928c6ca5315ce5d84f54 git Not specified
CNA Linux Linux affected 48eb03dd26304c24f03bdbb9382e89c8564e71df a6e4b9a6deb9362ef7a0706c70d674e92fe1411a git Not specified
CNA Linux Linux affected 6.8 Not specified
CNA Linux Linux unaffected 6.8 semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/53a5b262d706b572840cbe8feae392538077ee19 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bf9387488d6394845076928c6ca5315ce5d84f54 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a6e4b9a6deb9362ef7a0706c70d674e92fe1411a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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