Vulnerability · CVE-2026-99250
CVE-2026-99250: printk: Postpone kthread startup
Published Nov 3, 2026 · catalog updated Nov 3, 2026 · Linux Linux
Last checked Nov 7, 2026. A connected source was read within the last 7 days.
Check if you run it
No confirmed exploitation is on record for CVE-2026-99250. EPSS is 0.16%. Act only if a listed version of Linux Linux is installed.
Gaps on this record
- No version range is stored. A customer cannot check an installed version against this record.
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
Same product and reporting
- CVE-2026-99284 · Unknown
- CVE-2026-99283 · Low
- CVE-2026-99260 · Medium
- CVE-2026-99259 · Medium
- CVE-2026-99258 · High
- Severity
- Medium—
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.16%
- Remediation
- Not established
- Affected products
- linux kernel · package unmanaged · vendor Linux Linux
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.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- linux kernelversion unspecified
- package unmanagedversion unspecified
- vendor Linux Linuxversion unspecified
How to fix CVE-2026-99250
No stored fix
No vendor fix text is stored. Use the linked advisory before you change production.
Version check
No version range is stored, so an installed version cannot be checked on this page.
Advisory
Open the cve_org record and follow its fix.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-99250. EPSS is 0.16%. Act only if a listed version of Linux Linux is installed.
Which versions are affected?
Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
No weakness class is stored. EPSS 0.16%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
Timeline
Detection, updates, and resolution for this record.
Nov 3, 2026 · Linux Kernel CVE
Detected
From: Greg Kroah-Hartman 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 disap
Sources
- CVE.orgVulnerability recordCVE-2026-99250
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 report
cve.org - FIRST EPSSExploitation probabilityCVE-2026-99250
30-day exploitation probability 0.16%
first.org - Linux Kernel CVEVendor advisoryCVE-2026-99250
From: Greg Kroah-Hartman 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 re
git.kernel.org - Snyk Vulnerability DatabasePackage advisorySNYK-UNMANAGED-TORVALDSLINUX-22182560
Denial of Service (DoS)
security.snyk.io
References
Freshness
Last verified in this catalog Nov 7, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.
- FIRST EPSSNov 7, 2026
- Snyk Vulnerability DatabaseNov 6, 2026
- CVE.orgNov 4, 2026
- Linux Kernel CVENov 3, 2026