CVE-2026-31505

Kernel memory corruption via iavf queue-count race

Published Apr 22, 2026 · Updated Apr 22, 2026

Out-of-bounds writes in the Linux Kernel iavf driver from 5.17 allow local users to corrupt kernel memory through ethtool operations. iavf_get_sset_count() sizes a statistics buffer from real_num_tx_queues while iavf_get_ethtool_stats() writes entries using the concurrently changed num_active_queues value. Triggering the race requires local access to an iavf device and overlapping channel reconfiguration with statistics retrieval, enabling a system crash or compromise of kernel confidentiality and integrity.

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

Out-of-bounds writes in the Linux Kernel iavf driver from 5.17 allow local users to corrupt kernel memory through ethtool operations. iavf_get_sset_count() sizes a statistics buffer from real_num_tx_queues while iavf_get_ethtool_stats() writes entries using the concurrently changed num_active_queues value. Triggering the race requires local access to an iavf device and overlapping channel reconfiguration with statistics retrieval, enabling a system crash or compromise of kernel confidentiality and integrity.

The record

CVE
CVE-2026-31505
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-787, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 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=5.17
  2. Affected versionversion=64430f70ba6fcd5872ac190f4ae3ddee3f48f00d <1f931dee5b726df1940348ec31614d64bac03aa6
  3. Affected versionversion=64430f70ba6fcd5872ac190f4ae3ddee3f48f00d <bb85741d2dc2be207353a412f51b83697fcbefcf
  4. Affected versionversion=64430f70ba6fcd5872ac190f4ae3ddee3f48f00d <fdf902bf86a80bf15792a1d20a67a5302498d7f1
  5. Affected versionversion=64430f70ba6fcd5872ac190f4ae3ddee3f48f00d <fecacfc95f195b99c71c579a472120d0b4ed65fa

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.17; version=64430f70ba6fcd5872ac190f4ae3ddee3f48f00d <1f931dee5b726df1940348ec31614d64bac03aa6; version=64430f70ba6fcd5872ac190f4ae3ddee3f48f00d <bb85741d2dc2be207353a412f51b83697fcbefcf; version=64430f70ba6fcd5872ac190f4ae3ddee3f48f00d <fdf902bf86a80bf15792a1d20a67a5302498d7f1; version=64430f70ba6fcd5872ac190f4ae3ddee3f48f00d <fecacfc95f195b99c71c579a472120d0b4ed65fa

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-787Out-of-bounds Write
T1068Exploitation for Privilege Escalation

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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