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CVE-2026-93829

Estado: RecibidaSin puntuar—

In the Linux kernel, the following vulnerability has been resolved:

smb: client: fix races in cifsd thread creation

The cifsd demultiplex thread can run and access tcp_ses before the parent thread has finished populating tcp_ses, which the worker thread accesses locklessly.

Also, the kthread_run macro may start the thread before returning the thread pointer. Because the pointer is part of the structure that the thread can access, if the kernel is preempted after the thread is spawned, but before the thread pointer is populated and the thread attempts to exit, it will sleep, waiting for a SIGKILL signal.

Leer descripción completaMostrar menos

Fix this by moving creation of the thread to after all of tcp_ses'es fields are populated, and spawning the thread last, using a split kthread_create/wake_up_process logic.

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-93829",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "aaf737adb6937339494d5a7111f0433cd9676db8",
              "lessThan": "cfa09f63e75cf440c9be97d1e73d509bfbb2c2c5",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "aaf737adb6937339494d5a7111f0433cd9676db8",
              "lessThan": "ee8f811cbac56ffb738b3a73671a9e75b0f56e99",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "aaf737adb6937339494d5a7111f0433cd9676db8",
              "lessThan": "0eee1e6cddd1d9ce14da06e0238ca8d3362dec90",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "aaf737adb6937339494d5a7111f0433cd9676db8",
              "lessThan": "e8a5cf2ff5a13fefb228f2069e29dd7d8e37185d",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/smb/client/connect.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.22"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "2.6.22",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/smb/client/connect.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-24T17:17:16.630",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0eee1e6cddd1d9ce14da06e0238ca8d3362dec90",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/cfa09f63e75cf440c9be97d1e73d509bfbb2c2c5",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e8a5cf2ff5a13fefb228f2069e29dd7d8e37185d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ee8f811cbac56ffb738b3a73671a9e75b0f56e99",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix races in cifsd thread creation\n\nThe cifsd demultiplex thread can run and access tcp_ses before the parent\nthread has finished populating tcp_ses, which the worker thread accesses\nlocklessly.\n\nAlso, the kthread_run macro may start the thread before returning the\nthread pointer. Because the pointer is part of the structure that the\nthread can access, if the kernel is preempted after the thread is spawned,\nbut before the thread pointer is populated and the thread attempts to exit,\nit will sleep, waiting for a SIGKILL signal.\n\nFix this by moving creation of the thread to after all of tcp_ses'es\nfields are populated, and spawning the thread last, using a split\nkthread_create/wake_up_process logic."
    }
  ],
  "lastModified": "2026-10-03T11:17:52.570",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}