printk: Postpone kthread startup

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Summary

CVECVE-2026-99250
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-03 12:17:31 UTC
Updated2026-11-03 12:17:31 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 76f258bf3f2aae570209319944703a92ac64e29e a86bcdd84c8fe7a45f73e12d53fe06fea07d1ceb git Not specified
CNA Linux Linux affected 76f258bf3f2aae570209319944703a92ac64e29e 7595bacee48bc30b5021eccf199d704d4e5e5374 git Not specified
CNA Linux Linux affected 76f258bf3f2aae570209319944703a92ac64e29e 792acd173da0884f0172c68cb473f42cf93c647e git Not specified
CNA Linux Linux affected 76f258bf3f2aae570209319944703a92ac64e29e 5f339c46f153184570f16c8e789c9709b14cbe8b git Not specified
CNA Linux Linux affected 6.12 Not specified
CNA Linux Linux unaffected 6.12 semver Not specified
CNA Linux Linux unaffected 6.12.115 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.59 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.13 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/792acd173da0884f0172c68cb473f42cf93c647e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7595bacee48bc30b5021eccf199d704d4e5e5374 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a86bcdd84c8fe7a45f73e12d53fe06fea07d1ceb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5f339c46f153184570f16c8e789c9709b14cbe8b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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