CVE-2026-74708
Received Received - Intake

XSK Metadata 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: 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.

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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-2026-74708
EUVD
EUVD-2026-64395

Affected Vendors & Products

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

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Exploitability

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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves improper validation of launch-time metadata size in the XSK (AF_XDP) subsystem. The issue occurs when the registered metadata area does not contain the complete field, which extends beyond the first 16 bytes of struct xsk_tx_metadata. The kernel fails to reject requests with insufficient metadata, potentially leading to incorrect processing.

Detection Guidance

This vulnerability is specific to the Linux kernel's XSK (AF_XDP) subsystem. Detection requires checking kernel logs for XSK-related errors or examining kernel source code for improper metadata handling. No direct commands are provided in the context to detect this issue.

Impact Analysis

This vulnerability could allow an attacker with local access to cause a denial of service or unexpected behavior in the kernel by providing malformed metadata. It may lead to crashes, data corruption, or privilege escalation if exploited.

Mitigation Strategies

Apply the latest Linux kernel patches that address this issue. Monitor kernel updates from your distribution and update to a patched version. No specific mitigation commands are provided in the context.

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