CVE-2026-74306

Kernel memory corruption via migration write race

Published Aug 15, 2026 · Updated Aug 15, 2026

Out-of-bounds write in the Linux kernel allows local users to corrupt kernel memory through concurrent QAT migration writes. The qat_vf_resume_write() function checks filp->f_pos before taking migf->lock, then re-reads the shared offset under the lock and copies without repeating the bounds check. A low-privileged local user with access to the QAT VF migration-resume file can race two writers, with a kernel crash or privilege escalation as the reported consequences.

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 write in the Linux kernel allows local users to corrupt kernel memory through concurrent QAT migration writes. The qat_vf_resume_write() function checks filp->f_pos before taking migf->lock, then re-reads the shared offset under the lock and copies without repeating the bounds check. A low-privileged local user with access to the QAT VF migration-resume file can race two writers, with a kernel crash or privilege escalation as the reported consequences.

The record

CVE
CVE-2026-74306
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=6.10
  2. Affected versionversion=bb208810b1abf1c84870cfbe1cc9cf1a1d35c607 <4ec5e932e636896e97e4c6a8205b0ac76d52421a
  3. Affected versionversion=bb208810b1abf1c84870cfbe1cc9cf1a1d35c607 <6465af0004dc1b067129a26ef44f19cdf13bbce6
  4. Affected versionversion=bb208810b1abf1c84870cfbe1cc9cf1a1d35c607 <b6fd7a40a66485c8aa8156d8fcf50b95cb8ba281
  5. Affected versionversion=bb208810b1abf1c84870cfbe1cc9cf1a1d35c607 <d416dcefdbac90d96b22485fd93f28229ad9984b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.10; version=bb208810b1abf1c84870cfbe1cc9cf1a1d35c607 <4ec5e932e636896e97e4c6a8205b0ac76d52421a; version=bb208810b1abf1c84870cfbe1cc9cf1a1d35c607 <6465af0004dc1b067129a26ef44f19cdf13bbce6; version=bb208810b1abf1c84870cfbe1cc9cf1a1d35c607 <b6fd7a40a66485c8aa8156d8fcf50b95cb8ba281; version=bb208810b1abf1c84870cfbe1cc9cf1a1d35c607 <d416dcefdbac90d96b22485fd93f28229ad9984b

Published CVSS scores

7.8Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0Oracle LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0Red HatCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5SUSECVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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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