CVE-2026-89589

System deadlock via hard-IRQ lock inversion

Published Sep 11, 2026 · Updated Sep 11, 2026

Deadlock in Linux 6.10 CXL CPER handling allows attackers to hang the system when a GHES error interrupt arrives during work registration. The registration and unregistration helpers hold cxl_cper_work_lock or cxl_cper_prot_err_work_lock with local interrupts enabled, while the hard-IRQ post paths acquire the same lock and spin after preempting its holder. Reachability requires the affected CXL CPER path and a same-CPU GHES interrupt during the narrow lock-held interval; the bounded consequence is a system hang.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deadlock in Linux 6.10 CXL CPER handling allows attackers to hang the system when a GHES error interrupt arrives during work registration. The registration and unregistration helpers hold cxl_cper_work_lock or cxl_cper_prot_err_work_lock with local interrupts enabled, while the hard-IRQ post paths acquire the same lock and spin after preempting its holder. Reachability requires the affected CXL CPER path and a same-CPU GHES interrupt during the narrow lock-held interval; the bounded consequence is a system hang.

The record

CVE
CVE-2026-89589
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
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?

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  1. Affected versionversion=5e4a264bf8b55d5a1b4c8cd96ac10b99f98d7487 <0e25382b05de48d09b243d3d447d236a6d735bc2
  2. Affected versionversion=5e4a264bf8b55d5a1b4c8cd96ac10b99f98d7487 <6625ca499c3131ef63be3215f8f942d7a097ea3a
  3. Affected versionversion=5e4a264bf8b55d5a1b4c8cd96ac10b99f98d7487 <c735dbce7ad03df708bf22ec964f67e43cbc823a
  4. Affected versionversion=6.10

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5e4a264bf8b55d5a1b4c8cd96ac10b99f98d7487 <0e25382b05de48d09b243d3d447d236a6d735bc2; version=5e4a264bf8b55d5a1b4c8cd96ac10b99f98d7487 <6625ca499c3131ef63be3215f8f942d7a097ea3a; version=5e4a264bf8b55d5a1b4c8cd96ac10b99f98d7487 <c735dbce7ad03df708bf22ec964f67e43cbc823a; version=6.10

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

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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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

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Technologies

Your stack

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Your stack

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