CVE-2026-74709
CVE CVE-2026-74709EUVD EUVD-2026-64396Published 2026-08-22T15:33:06.000Z
What the advisory describes
In 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.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux 6.15; patch: 7.2; ca4419f15abd19ba8be1e109661b60f9f5b6c9f0 <9f60a67df8d3c862503bee62bada8e7089cba438; d9d736c416c9a85f84e15435ba82a177262e745b; ca4419f15abd19ba8be1e109661b60f9f5b6c9f0 <0ba2e1eb07a826d021344e2f146b6716c58139eb; patch: 6.18.45; 6.14.2 <6.15; patch: 7.1.9; patch: 0; ca4419f15abd19ba8be1e109661b60f9f5b6c9f0 <eb4c613d4ebc3f664e70d572b8867ba114a8754e
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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