FKIE_CVE-2026-99250

Vulnerability from fkie_nvd - Published: 2026-11-03 12:17 - Updated: 2026-11-03 12:17
Severity
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5f339c46f153184570f16c8e789c9709b14cbe8b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7595bacee48bc30b5021eccf199d704d4e5e5374
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/792acd173da0884f0172c68cb473f42cf93c647e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a86bcdd84c8fe7a45f73e12d53fe06fea07d1ceb
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "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"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "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\u0027s 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."
    }
  ],
  "id": "CVE-2026-99250",
  "lastModified": "2026-11-03T12:17:31.603",
  "metrics": {},
  "published": "2026-11-03T12:17:31.603",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "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"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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