CVE-2026-64438

Host crash via QAT VF2PF teardown race

Published Jul 25, 2026 · Updated Jul 25, 2026

Use-after-free in the Intel QAT driver in Linux Kernel allows local users to crash the host during SR-IOV teardown. adf_disable_sriov() frees per-VF state and destroys its mutexes without blocking or draining VF2PF response work, leaving queued workers with stale pointers. A low-privileged local context and an Intel QAT physical function using SR-IOV are required; the published trace demonstrates a host null-pointer crash.

CVSS severity8.8
High
EPSS probability0.14%
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 Intel QAT driver in Linux Kernel allows local users to crash the host during SR-IOV teardown. adf_disable_sriov() frees per-VF state and destroys its mutexes without blocking or draining VF2PF response work, leaving queued workers with stale pointers. A low-privileged local context and an Intel QAT physical function using SR-IOV are required; the published trace demonstrates a host null-pointer crash.

The record

CVE
CVE-2026-64438
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-825
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 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=4.3
  2. Affected versionversion=ed8ccaef52fa03fb03cff45b380f72c9f869f273 <218c2836b3987f3fa1d9eac505462cded0821e4c
  3. Affected versionversion=ed8ccaef52fa03fb03cff45b380f72c9f869f273 <277281c10c63791067d24d421f7c43a15faa9096
  4. Affected versionversion=ed8ccaef52fa03fb03cff45b380f72c9f869f273 <446b4d77599cf1a168573f7fb32a4a6aa4f09219
  5. Affected versionversion=ed8ccaef52fa03fb03cff45b380f72c9f869f273 <49cd5ac6de8de39a14ead609bb552d372d5602cd
  6. Affected versionversion=ed8ccaef52fa03fb03cff45b380f72c9f869f273 <51144032248cc4ea22917370565650670b8b4e9b
  7. Affected versionversion=ed8ccaef52fa03fb03cff45b380f72c9f869f273 <5d916c1eae1933511a69bffe243b4ee5d7da399c
  8. Affected versionversion=ed8ccaef52fa03fb03cff45b380f72c9f869f273 <6e92b28cd74fa433658efeadf21b9d4b01023d7d
  9. Affected versionversion=ed8ccaef52fa03fb03cff45b380f72c9f869f273 <f344a369d0380d54c8d6c8d24734a78dd5a89817

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.3; version=ed8ccaef52fa03fb03cff45b380f72c9f869f273 <218c2836b3987f3fa1d9eac505462cded0821e4c; version=ed8ccaef52fa03fb03cff45b380f72c9f869f273 <277281c10c63791067d24d421f7c43a15faa9096; version=ed8ccaef52fa03fb03cff45b380f72c9f869f273 <446b4d77599cf1a168573f7fb32a4a6aa4f09219; version=ed8ccaef52fa03fb03cff45b380f72c9f869f273 <49cd5ac6de8de39a14ead609bb552d372d5602cd; version=ed8ccaef52fa03fb03cff45b380f72c9f869f273 <51144032248cc4ea22917370565650670b8b4e9b; version=ed8ccaef52fa03fb03cff45b380f72c9f869f273 <5d916c1eae1933511a69bffe243b4ee5d7da399c; version=ed8ccaef52fa03fb03cff45b380f72c9f869f273 <6e92b28cd74fa433658efeadf21b9d4b01023d7d; version=ed8ccaef52fa03fb03cff45b380f72c9f869f273 <f344a369d0380d54c8d6c8d24734a78dd5a89817

Published CVSS scores

8.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/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

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-825Expired Pointer Dereference

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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