CVE-2026-74328

Local kernel compromise via premature page destruction

Published Aug 15, 2026 · Updated Aug 15, 2026

Use-after-free in Linux kernel 6.19 allows local users to compromise the kernel through concurrent iommufd and dma-buf teardown. iopt_release_pages() destroys the pages mutex and frees iopt_pages before dma-buf invalidation callbacks finish detaching and can still lock that mutex. Access to /dev/iommu or /dev/vfio/vfio and a compatible dma-buf is required; the race enables memory access or corruption and a kernel crash.

CVSS severity8.8
High
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux kernel 6.19 allows local users to compromise the kernel through concurrent iommufd and dma-buf teardown. iopt_release_pages() destroys the pages mutex and frees iopt_pages before dma-buf invalidation callbacks finish detaching and can still lock that mutex. Access to /dev/iommu or /dev/vfio/vfio and a compatible dma-buf is required; the race enables memory access or corruption and a kernel crash.

The record

CVE
CVE-2026-74328
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, CWE-590, T1068, T1499.004
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=6.19
  2. Affected versionversion=71db84a092c399f434976d0522e848e9803cd51a <0507fcedbdcc87281ef8639c045fc9980363bbb6
  3. Affected versionversion=71db84a092c399f434976d0522e848e9803cd51a <f2d70dbd3dcefa8e3c380beff9c31f5f033a4221

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.19; version=71db84a092c399f434976d0522e848e9803cd51a <0507fcedbdcc87281ef8639c045fc9980363bbb6; version=71db84a092c399f434976d0522e848e9803cd51a <f2d70dbd3dcefa8e3c380beff9c31f5f033a4221

Published CVSS scores

8.8Linux CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-416Use After Free
CWE-590Free of Memory not on the Heap
T1068Exploitation for Privilege Escalation
T1499.004Application or System Exploitation

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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