CVE-2026-99058

Kernel fault via unchecked chained-work pointer

Published Oct 23, 2026 · Updated Oct 23, 2026

NULL dereference in Linux workqueue handling allows attackers to cause a kernel fault via queueing during workqueue teardown. The is_chained_work() helper dereferences worker->current_pwq without checking whether the kworker is executing a work item, when that pointer is populated. The fault requires a kworker outside work-item execution to queue work on a draining or destroying workqueue; public evidence does not establish an attacker-controlled trigger or required privileges.

CVSS severityUnavailable
Unscored
EPSS probability0.19%
Next 30 days · Nov 1, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL dereference in Linux workqueue handling allows attackers to cause a kernel fault via queueing during workqueue teardown. The is_chained_work() helper dereferences worker->current_pwq without checking whether the kworker is executing a work item, when that pointer is populated. The fault requires a kworker outside work-item execution to queue work on a draining or destroying workqueue; public evidence does not establish an attacker-controlled trigger or required privileges.

The record

CVE
CVE-2026-99058
Published
Oct 23, 2026
Updated
Oct 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 23, 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=3.9
  2. Affected versionversion=8d03ecfe471802d6afe97da97722b6924533aa82 <1a2668682e998039a027796b236319b380078a6a
  3. Affected versionversion=8d03ecfe471802d6afe97da97722b6924533aa82 <3dc61af2998cfc7312d6e59bbdcd5eed074483f2
  4. Affected versionversion=8d03ecfe471802d6afe97da97722b6924533aa82 <729d576df89c7e4341e58c452f8890620a610ac2
  5. Affected versionversion=8d03ecfe471802d6afe97da97722b6924533aa82 <980db94e3eeefdd8a1c46f86412c33a7f7806f51
  6. Affected versionversion=8d03ecfe471802d6afe97da97722b6924533aa82 <b12a25fb2b9d5dac80e419d695450cc17a51fdfd

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=3.9; version=8d03ecfe471802d6afe97da97722b6924533aa82 <1a2668682e998039a027796b236319b380078a6a; version=8d03ecfe471802d6afe97da97722b6924533aa82 <3dc61af2998cfc7312d6e59bbdcd5eed074483f2; version=8d03ecfe471802d6afe97da97722b6924533aa82 <729d576df89c7e4341e58c452f8890620a610ac2; version=8d03ecfe471802d6afe97da97722b6924533aa82 <980db94e3eeefdd8a1c46f86412c33a7f7806f51; version=8d03ecfe471802d6afe97da97722b6924533aa82 <b12a25fb2b9d5dac80e419d695450cc17a51fdfd

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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 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

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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