{"api_version":"1","generated_at":"2026-11-10T17:01:37+00:00","cve":"CVE-2026-99250","urls":{"html":"https://cve.report/CVE-2026-99250","api":"https://cve.report/api/cve/CVE-2026-99250.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-99250","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-99250"},"summary":{"title":"printk: Postpone kthread startup","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nprintk: Postpone kthread startup\n\nThere have been various bug reports related to SMP systems hanging\non boot. The reports vary but seem to have some overlap with regard\nto missed IPI's during SMP setup. The reports also show that\nreverting NBCON console usage allows the bugs to disappear.\n\nThe NBCON kthreads for console printing are started very early\nduring boot using early_initcall(). Since these kthreads are\nasynchronously enabling/disabling interrupts during early boot, they\nmay be interfering with early SMP setup on some hardware platforms.\n\nStarting the console printing kthreads later has shown to avoid the\nhanging on systems that could previously reproduce the issue.\n\nPostpone kthread starting until after all arch initcalls have\ncompleted.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-11-03 12:17:31","updated_at":"2026-11-03 12:17:31"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/792acd173da0884f0172c68cb473f42cf93c647e","name":"https://git.kernel.org/stable/c/792acd173da0884f0172c68cb473f42cf93c647e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7595bacee48bc30b5021eccf199d704d4e5e5374","name":"https://git.kernel.org/stable/c/7595bacee48bc30b5021eccf199d704d4e5e5374","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a86bcdd84c8fe7a45f73e12d53fe06fea07d1ceb","name":"https://git.kernel.org/stable/c/a86bcdd84c8fe7a45f73e12d53fe06fea07d1ceb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5f339c46f153184570f16c8e789c9709b14cbe8b","name":"https://git.kernel.org/stable/c/5f339c46f153184570f16c8e789c9709b14cbe8b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-99250","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-99250","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 76f258bf3f2aae570209319944703a92ac64e29e a86bcdd84c8fe7a45f73e12d53fe06fea07d1ceb git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 76f258bf3f2aae570209319944703a92ac64e29e 7595bacee48bc30b5021eccf199d704d4e5e5374 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 76f258bf3f2aae570209319944703a92ac64e29e 792acd173da0884f0172c68cb473f42cf93c647e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 76f258bf3f2aae570209319944703a92ac64e29e 5f339c46f153184570f16c8e789c9709b14cbe8b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.12","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.115 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.59 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.13 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["kernel/printk/printk.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"a86bcdd84c8fe7a45f73e12d53fe06fea07d1ceb","status":"affected","version":"76f258bf3f2aae570209319944703a92ac64e29e","versionType":"git"},{"lessThan":"7595bacee48bc30b5021eccf199d704d4e5e5374","status":"affected","version":"76f258bf3f2aae570209319944703a92ac64e29e","versionType":"git"},{"lessThan":"792acd173da0884f0172c68cb473f42cf93c647e","status":"affected","version":"76f258bf3f2aae570209319944703a92ac64e29e","versionType":"git"},{"lessThan":"5f339c46f153184570f16c8e789c9709b14cbe8b","status":"affected","version":"76f258bf3f2aae570209319944703a92ac64e29e","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["kernel/printk/printk.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.12"},{"lessThan":"6.12","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.115","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.59","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.13","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.115","versionStartIncluding":"6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.59","versionStartIncluding":"6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.13","versionStartIncluding":"6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3","versionStartIncluding":"6.12","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nprintk: Postpone kthread startup\n\nThere have been various bug reports related to SMP systems hanging\non boot. The reports vary but seem to have some overlap with regard\nto missed IPI's during SMP setup. The reports also show that\nreverting NBCON console usage allows the bugs to disappear.\n\nThe NBCON kthreads for console printing are started very early\nduring boot using early_initcall(). Since these kthreads are\nasynchronously enabling/disabling interrupts during early boot, they\nmay be interfering with early SMP setup on some hardware platforms.\n\nStarting the console printing kthreads later has shown to avoid the\nhanging on systems that could previously reproduce the issue.\n\nPostpone kthread starting until after all arch initcalls have\ncompleted."}],"providerMetadata":{"dateUpdated":"2026-11-03T11:18:27.105Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/a86bcdd84c8fe7a45f73e12d53fe06fea07d1ceb"},{"url":"https://git.kernel.org/stable/c/7595bacee48bc30b5021eccf199d704d4e5e5374"},{"url":"https://git.kernel.org/stable/c/792acd173da0884f0172c68cb473f42cf93c647e"},{"url":"https://git.kernel.org/stable/c/5f339c46f153184570f16c8e789c9709b14cbe8b"}],"title":"printk: Postpone kthread startup","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-99250","datePublished":"2026-11-03T11:18:27.105Z","dateReserved":"2026-09-25T10:25:14.403Z","dateUpdated":"2026-11-03T11:18:27.105Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-11-03 12:17:31","lastModifiedDate":"2026-11-03 12:17:31","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"99250","Ordinal":"1","Title":"printk: Postpone kthread startup","CVE":"CVE-2026-99250","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"99250","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nprintk: Postpone kthread startup\n\nThere have been various bug reports related to SMP systems hanging\non boot. The reports vary but seem to have some overlap with regard\nto missed IPI's during SMP setup. The reports also show that\nreverting NBCON console usage allows the bugs to disappear.\n\nThe NBCON kthreads for console printing are started very early\nduring boot using early_initcall(). Since these kthreads are\nasynchronously enabling/disabling interrupts during early boot, they\nmay be interfering with early SMP setup on some hardware platforms.\n\nStarting the console printing kthreads later has shown to avoid the\nhanging on systems that could previously reproduce the issue.\n\nPostpone kthread starting until after all arch initcalls have\ncompleted.","Type":"Description","Title":"printk: Postpone kthread startup"}]}}}