CVE-2026-74710
Received Received - Intake

AF_XDP TX Metadata Length Validation Flaw in Linux Kernel

Publication date: 2026-08-22

Last updated on: 2026-08-22

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: xsk: require at least 16 bytes of TX metadata AF_XDP accepts a TX metadata length as small as eight bytes, but every supported request needs the flags plus at least one eight-byte request field. Such short metadata also lets the kernel read beyond the registered area. Require 16 bytes rather than sizeof(struct xsk_tx_metadata) to preserve compatibility with applications that do not use launch-time metadata.

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Meta Information

Published
2026-08-22
Last Modified
2026-08-22
Generated
2026-08-22
AI Q&A
2026-08-22
EPSS Evaluated
N/A
NVD
CVE-2026-74710
EUVD
EUVD-2026-64397

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves the AF_XDP subsystem accepting TX metadata as small as eight bytes. However, every supported request requires flags plus at least one eight-byte field, meaning shorter metadata could cause the kernel to read beyond the registered memory area. The fix requires at least 16 bytes of TX metadata to prevent this issue.

Impact Analysis

This vulnerability could allow an attacker to cause memory corruption or crashes in the Linux kernel by sending maliciously crafted AF_XDP packets with insufficient TX metadata. This may lead to denial-of-service conditions or potential privilege escalation if exploited.

Mitigation Strategies

Update the Linux kernel to a version that includes the fix for this vulnerability. Ensure the kernel enforces a minimum of 16 bytes for TX metadata in AF_XDP to prevent out-of-bounds reads.

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