VulnerabilityPublished 23 Oct 2026

CVE-2026-99058: Linux kernel · workqueue: Fix NULL current_pwq deref in chained work check

Source GCVE Database

Authoritative record:CVE-2026-99058· Medium

Not known to be exploited · fixed in b12a25fb2b9d5dac80e419d695450cc17a51fdfd : update Linux kernel when convenient.

Data as of 26 Oct 2026, 12:55 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in b12a25fb2b9d5dac80e419d695450cc17a51fdfd, 980db94e3eeefdd8a1c46f86412c33a7f7806f51, 729d576df89c7e4341e58c452f8890620a610ac2 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 23 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

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What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 8d03ecfe471802d6afe97da97722b6924533aa82, < b12a25fb2b9d5dac80e419d695450cc17a51fdfd	Fixed in b12a25fb2b9d5dac80e419d695450cc17a51fdfd
LinuxLinux	Affected ≥ 8d03ecfe471802d6afe97da97722b6924533aa82, < 980db94e3eeefdd8a1c46f86412c33a7f7806f51	Fixed in 980db94e3eeefdd8a1c46f86412c33a7f7806f51
LinuxLinux	Affected ≥ 8d03ecfe471802d6afe97da97722b6924533aa82, < 729d576df89c7e4341e58c452f8890620a610ac2	Fixed in 729d576df89c7e4341e58c452f8890620a610ac2
LinuxLinux	Affected ≥ 8d03ecfe471802d6afe97da97722b6924533aa82, < 3dc61af2998cfc7312d6e59bbdcd5eed074483f2	Fixed in 3dc61af2998cfc7312d6e59bbdcd5eed074483f2
LinuxLinux	Affected ≥ 8d03ecfe471802d6afe97da97722b6924533aa82, < 1a2668682e998039a027796b236319b380078a6a	Fixed in 1a2668682e998039a027796b236319b380078a6a
LinuxLinux	Affected =3.9	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: workqueue: Fix NULL current_pwq deref in chained work check current_wq_worker() only tells us that %current is a kworker. It does not guarantee that the worker is currently executing a work item, as worker->current_pwq is populated only while process_one_work() is running the work function. is_chained_work() can be reached while queueing on a draining or destroying workqueue. If a kworker outside work-item execution reaches that path, current_wq_worker() returns a worker but worker->current_pwq is NULL, and the chained-work test can fault before it emits the intended warning. Guard the chained-work test with worker->current_pwq. A kworker without current_pwq is not executing work on the target workqueue, so the helper should return false and let the draining/destroying warning fire.

References

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