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CVE-2026-99250

printk: Postpone kthread startup

N/A
Published: November 3, 2026 at 11:18 AM UTC
Updated: November 3, 2026 at 12:17 PM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
N/A

Description

In the Linux kernel, the following vulnerability has been resolved: printk: Postpone kthread startup There have been various bug reports related to SMP systems hanging on boot. The reports vary but seem to have some overlap with regard to missed IPI's during SMP setup. The reports also show that reverting NBCON console usage allows the bugs to disappear. The NBCON kthreads for console printing are started very early during boot using early_initcall(). Since these kthreads are asynchronously enabling/disabling interrupts during early boot, they may be interfering with early SMP setup on some hardware platforms. Starting the console printing kthreads later has shown to avoid the hanging on systems that could previously reproduce the issue. Postpone kthread starting until after all arch initcalls have completed.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
90%
6.1276f258bf3f2aae570209319944703a92ac64e29e
Vendor states this is fixed in 6.12.115 (unaffected)
Vendor states this is fixed in 6.18.59 (unaffected)
Vendor states this is fixed in 7.2.13 (unaffected)
Vendor states this is fixed in 7.3 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (4)

Source: cverecord
https://git.kernel.org/stable/c/a86bcdd84c8fe7a45f73e12d53fe06fea07d1ceb
Source: cverecord
https://git.kernel.org/stable/c/7595bacee48bc30b5021eccf199d704d4e5e5374
Source: cverecord
https://git.kernel.org/stable/c/792acd173da0884f0172c68cb473f42cf93c647e
Source: cverecord
https://git.kernel.org/stable/c/5f339c46f153184570f16c8e789c9709b14cbe8b

Quick Info

StatusRECEIVED

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