CVE-2026-23056

Duplicate queue cleanup via default mremap

Published Feb 4, 2026 · Updated Feb 4, 2026

Memory-management error in the uacce driver in Linux Kernel allows local users to duplicate queue cleanup through a crafted mremap sequence. The uacce_vm_ops table omits an mremap handler, so the default operation copies vm_private_data into a second VMA and both VMAs invoke vma_close for the same queue. Reachability requires local access to a uacce mapping; the reported sequence frees q->qfr twice, but the second release is safe because the pointer is cleared.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory-management error in the uacce driver in Linux Kernel allows local users to duplicate queue cleanup through a crafted mremap sequence. The uacce_vm_ops table omits an mremap handler, so the default operation copies vm_private_data into a second VMA and both VMAs invoke vma_close for the same queue. Reachability requires local access to a uacce mapping; the reported sequence frees q->qfr twice, but the second release is safe because the pointer is cleared.

The record

CVE
CVE-2026-23056
Published
Feb 4, 2026
Updated
Feb 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

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 <02695347be532b628f22488300d40c4eba48b9b7
  2. Affected versionversion=015d239ac0142ad0e26567fd890ef8d171f13709 <4c042bc71474dbe417c268f4bfb8ec196f802f07
  3. Affected versionversion=015d239ac0142ad0e26567fd890ef8d171f13709 <a407ddd61b3e6afc5ccfcd1478797171cf5686ee
  4. Affected versionversion=015d239ac0142ad0e26567fd890ef8d171f13709 <ba29b59d124e725e0377f09b2044909c91d657a1
  5. Affected versionversion=5.7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=015d239ac0142ad0e26567fd890ef8d171f13709 <02695347be532b628f22488300d40c4eba48b9b7; version=015d239ac0142ad0e26567fd890ef8d171f13709 <4c042bc71474dbe417c268f4bfb8ec196f802f07; version=015d239ac0142ad0e26567fd890ef8d171f13709 <a407ddd61b3e6afc5ccfcd1478797171cf5686ee; version=015d239ac0142ad0e26567fd890ef8d171f13709 <ba29b59d124e725e0377f09b2044909c91d657a1; version=5.7

Published CVSS scores

No CVSS assessment is available in this record.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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