CVE-2026-99250

Full vulnerability record from the local CVENow database.

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.

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-11-03 12:17:31.603000

Last modified

2026-11-03 12:17:31.603000

View original CVE JSON

{
  "id": "CVE-2026-99250",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-11-03T12:17:31.603",
  "lastModified": "2026-11-03T12:17:31.603",
  "vulnStatus": "Received",
  "cveTags": [],
  "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."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "kernel/printk/printk.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "76f258bf3f2aae570209319944703a92ac64e29e",
              "lessThan": "a86bcdd84c8fe7a45f73e12d53fe06fea07d1ceb",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "76f258bf3f2aae570209319944703a92ac64e29e",
              "lessThan": "7595bacee48bc30b5021eccf199d704d4e5e5374",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "76f258bf3f2aae570209319944703a92ac64e29e",
              "lessThan": "792acd173da0884f0172c68cb473f42cf93c647e",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "76f258bf3f2aae570209319944703a92ac64e29e",
              "lessThan": "5f339c46f153184570f16c8e789c9709b14cbe8b",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "kernel/printk/printk.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6.12",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "6.12",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.115",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.59",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.13",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/5f339c46f153184570f16c8e789c9709b14cbe8b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7595bacee48bc30b5021eccf199d704d4e5e5374",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/792acd173da0884f0172c68cb473f42cf93c647e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a86bcdd84c8fe7a45f73e12d53fe06fea07d1ceb",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}