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CVE-2026-74707: xsk: validate metadata when processing requests

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-22 · updated 2026-10-16

Description

In the Linux kernel, the following vulnerability has been resolved: xsk: validate metadata when processing requests The zero-copy path validates TX metadata while obtaining the descriptor context, then reads it again later when preparing the hardware request. User space can change the metadata between those operations and bypass the original validation. Validate the metadata in xsk_tx_metadata_request() and use the resulting flags snapshot for every feature check. Read request fields once so all zero-copy drivers process only values observed after successful validation.

Affected products

• Linux kernel: from 6.14.2 before 6.15; 6.15 — fixed in 6.15, 7.2

How to fix

Upgrade to a fixed version: Linux kernel 6.15, 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0cc7aa6e0d19027fdd42e6fbd156267ac1e3bbba
• https://git.kernel.org/stable/c/5fd121971912dee2f5af1efec64462ac722deb17
• https://git.kernel.org/stable/c/849b1664dbda1cf6c63e0fd4f9dec23782b8c851

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