CVE-2026-74708

Service interruption via undersized XSK metadata

Published Aug 22, 2026 · Updated Aug 25, 2026

Improper metadata-size validation in affected Linux kernel versions allows local users to interrupt service via an AF_XDP transmit request. The xsk path reads launch-time fields beyond the registered first 16 bytes of struct xsk_tx_metadata and re-reads mutable flags, allowing concurrent user-space changes to make request and completion handling disagree. Reachability requires local low-privileged access to drive the affected transmit path, and the vendor assessment bounds the demonstrated impact to availability.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper metadata-size validation in affected Linux kernel versions allows local users to interrupt service via an AF_XDP transmit request. The xsk path reads launch-time fields beyond the registered first 16 bytes of struct xsk_tx_metadata and re-reads mutable flags, allowing concurrent user-space changes to make request and completion handling disagree. Reachability requires local low-privileged access to drive the affected transmit path, and the vendor assessment bounds the demonstrated impact to availability.

The record

CVE
CVE-2026-74708
Published
Aug 22, 2026
Updated
Aug 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-1284, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.14.2 <6.15
  2. Affected versionversion=6.15
  3. Affected versionversion=ca4419f15abd19ba8be1e109661b60f9f5b6c9f0 <439ce2dddf3d22129b9113a7881637256a35e936
  4. Affected versionversion=ca4419f15abd19ba8be1e109661b60f9f5b6c9f0 <af511afa1d2977f384044df78d6fbf9fba653f7a
  5. Affected versionversion=ca4419f15abd19ba8be1e109661b60f9f5b6c9f0 <bc63d47611c07b0d5d655fe1a590861931527920
  6. Affected versionversion=d9d736c416c9a85f84e15435ba82a177262e745b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.14.2 <6.15; version=6.15; version=ca4419f15abd19ba8be1e109661b60f9f5b6c9f0 <439ce2dddf3d22129b9113a7881637256a35e936; version=ca4419f15abd19ba8be1e109661b60f9f5b6c9f0 <af511afa1d2977f384044df78d6fbf9fba653f7a; version=ca4419f15abd19ba8be1e109661b60f9f5b6c9f0 <bc63d47611c07b0d5d655fe1a590861931527920; version=d9d736c416c9a85f84e15435ba82a177262e745b

Published CVSS scores

7.8cve.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1284Improper Validation of Specified Quantity in Input
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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