CVE-2026-89762Hinoki check available

Kernel use-after-free via stale-label replacement

Published Sep 11, 2026 · Updated Sep 11, 2026

Use-after-free in AppArmor in affected Linux kernels allows attackers to trigger invalid credential access during a concurrent policy update. begin_current_label_crit_section() synchronously replaces credentials for a stale label, dropping references still needed after revert_creds(). The demonstrated trigger requires a profile disable while a profiled process is blocked in a FUSE passthrough splice; published evidence establishes a KASAN fault but no stronger consequence.

CVSS severityUnavailable
Unscored
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Use-after-free in AppArmor in affected Linux kernels allows attackers to trigger invalid credential access during a concurrent policy update. begin_current_label_crit_section() synchronously replaces credentials for a stale label, dropping references still needed after revert_creds(). The demonstrated trigger requires a profile disable while a profiled process is blocked in a FUSE passthrough splice; published evidence establishes a KASAN fault but no stronger consequence.

The record

CVE
CVE-2026-89762
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 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=2.6.36
  2. Affected versionversion=c75afcd153f6147d3b094f45a1d87e5df7f4f053 <361488984d668235438faac28635f3632351407f
  3. Affected versionversion=c75afcd153f6147d3b094f45a1d87e5df7f4f053 <3f4ae5fab613dca01d6a2a8210dd832e009fcf47
  4. Affected versionversion=c75afcd153f6147d3b094f45a1d87e5df7f4f053 <580f777d6d9fd07fc034bd1aeba5c30fd48871a2
  5. Affected versionversion=c75afcd153f6147d3b094f45a1d87e5df7f4f053 <587a6a92b93ec314c583bbf747413af170d42540

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.36; version=c75afcd153f6147d3b094f45a1d87e5df7f4f053 <361488984d668235438faac28635f3632351407f; version=c75afcd153f6147d3b094f45a1d87e5df7f4f053 <3f4ae5fab613dca01d6a2a8210dd832e009fcf47; version=c75afcd153f6147d3b094f45a1d87e5df7f4f053 <580f777d6d9fd07fc034bd1aeba5c30fd48871a2; version=c75afcd153f6147d3b094f45a1d87e5df7f4f053 <587a6a92b93ec314c583bbf747413af170d42540

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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