What’s Vulnerable › Vulnerabilities

CVE-2026-74708: xsk: validate launch-time metadata size

• 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 launch-time metadata size Launch-time metadata extends beyond the first 16 bytes of struct xsk_tx_metadata. Reject the request when the registered metadata area does not contain the complete field. Snapshot the validated flags for the generic transmit path and use that snapshot for request and completion processing, avoiding inconsistent decisions if user space changes the flags concurrently. Note that only xsk_skb_metadata is properly using the flags, __xsk_buff_get_metadata ignores them. Next commits address that.

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/439ce2dddf3d22129b9113a7881637256a35e936
• https://git.kernel.org/stable/c/af511afa1d2977f384044df78d6fbf9fba653f7a
• https://git.kernel.org/stable/c/bc63d47611c07b0d5d655fe1a590861931527920

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