VulnerabilityPublished 3 Nov 2026

CVE-2026-99250: Linux kernel · printk: Postpone kthread startup

Source GCVE Database

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Authoritative record:CVE-2026-99250· Medium

Not known to be exploited · fixed in a86bcdd84c8fe7a45f73e12d53fe06fea07d1ceb : update Linux kernel when convenient.

Data as of 3 Nov 2026, 13:28 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Patch: Available – fixed in a86bcdd84c8fe7a45f73e12d53fe06fea07d1ceb, 7595bacee48bc30b5021eccf199d704d4e5e5374, 792acd173da0884f0172c68cb473f42cf93c647e +1

Exploitation evidence

Disclosed: evidence found.
CVE published 3 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 3 Nov 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.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), 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.

ghsa-2r72-m44g-f7fh

What to do

Upgrade Linux kernel to a86bcdd84c8fe7a45f73e12d53fe06fea07d1ceb, 7595bacee48bc30b5021eccf199d704d4e5e5374, 792acd173da0884f0172c68cb473f42cf93c647e or 5f339c46f153184570f16c8e789c9709b14cbe8b.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 76f258bf3f2aae570209319944703a92ac64e29e, < a86bcdd84c8fe7a45f73e12d53fe06fea07d1ceb	Fixed in a86bcdd84c8fe7a45f73e12d53fe06fea07d1ceb
LinuxLinux	Affected ≥ 76f258bf3f2aae570209319944703a92ac64e29e, < 7595bacee48bc30b5021eccf199d704d4e5e5374	Fixed in 7595bacee48bc30b5021eccf199d704d4e5e5374
LinuxLinux	Affected ≥ 76f258bf3f2aae570209319944703a92ac64e29e, < 792acd173da0884f0172c68cb473f42cf93c647e	Fixed in 792acd173da0884f0172c68cb473f42cf93c647e
LinuxLinux	Affected ≥ 76f258bf3f2aae570209319944703a92ac64e29e, < 5f339c46f153184570f16c8e789c9709b14cbe8b	Fixed in 5f339c46f153184570f16c8e789c9709b14cbe8b
LinuxLinux	Affected =6.12	Fixed in–

AI-suggested

A fix has been implemented that postpones the startup of printk console printing kthreads until after all architecture initialization calls complete. Users should update to a Linux kernel version that includes this fix once available. No other mitigation actions are indicated.

Description

A Linux kernel vulnerability related to early startup of printk console printing kernel threads (kthreads) has been resolved. The issue caused SMP systems to hang during boot due to interference from these kthreads asynchronously enabling/disabling interrupts early in the boot process. The fix involves postponing the startup of these kthreads until after all architecture-specific initialization calls have completed, preventing the boot hang on affected hardware platforms.

References

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