CVE-2026-23063

Kernel crash via concurrent uacce queue release

Published Feb 4, 2026 · Updated Feb 4, 2026

NULL pointer dereference in the Linux Kernel uacce driver allows local users to crash the kernel during virtual-machine shutdown. The uacce_fops_release and uacce_remove paths can run concurrently while an accelerator remains active, letting uacce_put_queue access a cleared ops pointer. The demonstrated gate is shutdown of a virtualized system while an accelerator remains active, and the reported consequence is availability loss only.

CVSS severity5.5
Medium
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

NULL pointer dereference in the Linux Kernel uacce driver allows local users to crash the kernel during virtual-machine shutdown. The uacce_fops_release and uacce_remove paths can run concurrently while an accelerator remains active, letting uacce_put_queue access a cleared ops pointer. The demonstrated gate is shutdown of a virtualized system while an accelerator remains active, and the reported consequence is availability loss only.

The record

CVE
CVE-2026-23063
Published
Feb 4, 2026
Updated
Feb 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 4, 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=015d239ac0142ad0e26567fd890ef8d171f13709 <26c08dabe5475d99a13f353d8dd70e518de45663
  2. Affected versionversion=015d239ac0142ad0e26567fd890ef8d171f13709 <43f233eb6e7b9d88536881a9bc43726d0e34800d
  3. Affected versionversion=015d239ac0142ad0e26567fd890ef8d171f13709 <47634d70073890c9c37e39ab4ff93d4b585b028a
  4. Affected versionversion=015d239ac0142ad0e26567fd890ef8d171f13709 <92e4f11e29b98ef424ff72d6371acac03e5d973c
  5. Affected versionversion=5.7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=015d239ac0142ad0e26567fd890ef8d171f13709 <26c08dabe5475d99a13f353d8dd70e518de45663; version=015d239ac0142ad0e26567fd890ef8d171f13709 <43f233eb6e7b9d88536881a9bc43726d0e34800d; version=015d239ac0142ad0e26567fd890ef8d171f13709 <47634d70073890c9c37e39ab4ff93d4b585b028a; version=015d239ac0142ad0e26567fd890ef8d171f13709 <92e4f11e29b98ef424ff72d6371acac03e5d973c; version=5.7

Published CVSS scores

5.5NISTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CanonicalCVSS: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 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-476NULL Pointer Dereference
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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