CVE-2026-64051

Local privilege escalation via QAIC VMA overmapping

Published Jul 19, 2026 · Updated Jul 19, 2026

Use-after-free in the Linux Kernel QAIC accelerator driver allows local users to gain kernel privileges through device mmap operations. The qaic_gem_object_mmap function passes a buffer object's scatter-gather length to remap_pfn_range without capping it to the remaining VMA, leaving extra PFNs mapped after munmap releases only the VMA. Access to a QAIC accelerator device node is required; stale mappings permit kernel memory access and can escalate privileges or crash the host.

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

Use-after-free in the Linux Kernel QAIC accelerator driver allows local users to gain kernel privileges through device mmap operations. The qaic_gem_object_mmap function passes a buffer object's scatter-gather length to remap_pfn_range without capping it to the remaining VMA, leaving extra PFNs mapped after munmap releases only the VMA. Access to a QAIC accelerator device node is required; stale mappings permit kernel memory access and can escalate privileges or crash the host.

The record

CVE
CVE-2026-64051
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 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=6.4
  2. Affected versionversion=ff13be8303336ead5621712f2c55012d738878b5 <8c795012d0e06b7740e40319b86ff8d2a435098d
  3. Affected versionversion=ff13be8303336ead5621712f2c55012d738878b5 <8dd6edbe26770df147136c3f2ac976c873b82650
  4. Affected versionversion=ff13be8303336ead5621712f2c55012d738878b5 <97a8e89cdef36207a8776edc03d6931763a06ad0
  5. Affected versionversion=ff13be8303336ead5621712f2c55012d738878b5 <9baafc2fea096279e75480f93fd5942e8336b510
  6. Affected versionversion=ff13be8303336ead5621712f2c55012d738878b5 <aa16b2bc0f02709919e2435f531406531e5bcc69

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.4; version=ff13be8303336ead5621712f2c55012d738878b5 <8c795012d0e06b7740e40319b86ff8d2a435098d; version=ff13be8303336ead5621712f2c55012d738878b5 <8dd6edbe26770df147136c3f2ac976c873b82650; version=ff13be8303336ead5621712f2c55012d738878b5 <97a8e89cdef36207a8776edc03d6931763a06ad0; version=ff13be8303336ead5621712f2c55012d738878b5 <9baafc2fea096279e75480f93fd5942e8336b510; version=ff13be8303336ead5621712f2c55012d738878b5 <aa16b2bc0f02709919e2435f531406531e5bcc69

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

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

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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