CVE-2026-90086

Summary

In 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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux48eb03dd26304c24f03bdbb9382e89c8564e71df < 53a5b262d706b572840cbe8feae392538077ee19affected
LinuxLinux48eb03dd26304c24f03bdbb9382e89c8564e71df < bf9387488d6394845076928c6ca5315ce5d84f54affected
LinuxLinux48eb03dd26304c24f03bdbb9382e89c8564e71df < a6e4b9a6deb9362ef7a0706c70d674e92fe1411aaffected
LinuxLinux6.8affected
LinuxLinux0 < 6.8unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References