CVE-2026-99250
printk: Postpone kthread startup
CVE-2026-99250 is a vulnerability with no CVSS score yet in Linux, published November 3, 2026. No source lists public exploit code. Fixed in linux 6.12.115-1.
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.
What each source reports
CVE List No score
printk: Postpone kthread startup
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.
- Record
CVE-2026-99250- Updated
- 2026-11-03
EUVDEUVD-2026-115761 No score
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.
- Record
EUVD-2026-115761- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-2r72-m44g-f7fh No score
In the Linux kernel, the following vulnerability has been resolved: printk: Postpone kthread...
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.
- Record
GHSA-2r72-m44g-f7fh- Updated
- 2026-11-03
NVD No score
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.
- Record
CVE-2026-99250- Updated
- 2026-11-03
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
linuxDebian:13 |
before 6.12.115-1, plus listed versions 6.12.100-16.12.101-16.12.105-16.12.107-16.12.111-1 Show 32 moreShow less6.12.113-16.12.38-16.12.41-16.12.43-16.12.43-1~bpo12+16.12.48-16.12.57-16.12.57-1~bpo12+16.12.63-16.12.63-1~bpo12+16.12.69-16.12.69-1~bpo12+16.12.73-16.12.73-1~bpo12+16.12.74-16.12.74-26.12.74-2~bpo12+16.12.85-16.12.85-1~bpo12+16.12.86-16.12.86-1~bpo12+16.12.88-16.12.88-1~bpo12+16.12.90-16.12.90-1~bpo12+16.12.90-26.12.90-2~bpo12+16.12.94-16.12.94-1~bpo12+16.12.95-16.12.95-1~bpo12+16.12.96-1 |
6.12.115-1 |
linuxDebian:14 |
All versions, plus listed versions 6.12.100-16.12.101-16.12.105-16.12.107-16.12.111-1 Show 45 moreShow less6.12.113-16.12.115-16.12.115-26.12.38-16.12.41-16.12.43-16.12.43-1~bpo12+16.12.48-16.12.57-16.12.57-1~bpo12+16.12.63-16.12.63-1~bpo12+16.12.69-16.12.69-1~bpo12+16.12.73-16.12.73-1~bpo12+16.12.74-16.12.74-26.12.74-2~bpo12+16.12.85-16.12.85-1~bpo12+16.12.86-16.12.86-1~bpo12+16.12.88-16.12.88-1~bpo12+16.12.90-16.12.90-1~bpo12+16.12.90-26.12.90-2~bpo12+16.12.94-16.12.94-1~bpo12+16.12.95-16.12.95-1~bpo12+16.12.96-16.13.10-1~exp16.13.11-1~exp16.13.2-1~exp16.13.3-1~exp16.13.4-1~exp16.13.5-1~exp16.13.6-1~exp16.13.7-1~exp16.13.8-1~exp16.13.9-1~exp16.13~rc6-1~exp1 |
None known |
History
| When | Changed | Sources |
|---|---|---|
| 2026-11-03 | affected, aliases, facts, references | OSV |
| 2026-11-03 | facts | EUVD, NVD |
| 2026-11-03 | title | CVE List |
| 2026-11-03 | created | EUVD, GitHub Advisories |
References
git.kernel.org/stable/c/a86bcdd84c8fe7a45f73e12d53fe06fea07d1ceb
nvd.nist.gov/vuln/detail/CVE-2026-99250
github.com/advisories/GHSA-2r72-m44g-f7fh
security-tracker.debian.org/tracker/CVE-2026-99250
Left out here: 147 versions. The JSON record has them.