CVE-2026-89491

Kernel crash via sleep under spinlock

Published Sep 11, 2026 · Updated Sep 11, 2026

Availability flaw in Linux OCFS2 allows local users to crash a debug-enabled kernel while mounting an OCFS2 volume. o2hb_region_pin() calls the sleeping configfs_depend_item() path while holding the o2hb_live_lock spinlock, triggering an invalid-context BUG. Reachability requires privileged OCFS2 mount activity and CONFIG_DEBUG_ATOMIC_SLEEP; the reported consequence is a kernel crash.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Availability flaw in Linux OCFS2 allows local users to crash a debug-enabled kernel while mounting an OCFS2 volume. o2hb_region_pin() calls the sleeping configfs_depend_item() path while holding the o2hb_live_lock spinlock, triggering an invalid-context BUG. Reachability requires privileged OCFS2 mount activity and CONFIG_DEBUG_ATOMIC_SLEEP; the reported consequence is a kernel crash.

The record

CVE
CVE-2026-89491
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
admin

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=2.6.38
  2. Affected versionversion=58a3158a5d17ddf4894db9e8ccaf92093ff8e42e <470212a5eefabcc16b8e2f7fe2844b8737fe571c
  3. Affected versionversion=58a3158a5d17ddf4894db9e8ccaf92093ff8e42e <49002acc520c61002ad195894ac391c94317d3ba
  4. Affected versionversion=58a3158a5d17ddf4894db9e8ccaf92093ff8e42e <af09df89db9a68a1d76df0f75667998135bc8d65
  5. Affected versionversion=58a3158a5d17ddf4894db9e8ccaf92093ff8e42e <ce035f208d68b812d83e5482980f2b1c88a9cd94

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.38; version=58a3158a5d17ddf4894db9e8ccaf92093ff8e42e <470212a5eefabcc16b8e2f7fe2844b8737fe571c; version=58a3158a5d17ddf4894db9e8ccaf92093ff8e42e <49002acc520c61002ad195894ac391c94317d3ba; version=58a3158a5d17ddf4894db9e8ccaf92093ff8e42e <af09df89db9a68a1d76df0f75667998135bc8d65; version=58a3158a5d17ddf4894db9e8ccaf92093ff8e42e <ce035f208d68b812d83e5482980f2b1c88a9cd94

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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