CVE-2025-39976

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: futex: Use correct exit on failure from futex_hash_allocate_default() copy_process() uses the wrong error exit path from futex_hash_allocate_default(). After exiting from futex_hash_allocate_default(), neither tasklist_lock nor siglock has been acquired. The exit label bad_fork_core_free unlocks both of these locks which is wrong. The next exit label, bad_fork_cancel_cgroup, is the correct exit. sched_cgroup_fork() did not allocate any resources that need to freed. Use bad_fork_cancel_cgroup on error exit from futex_hash_allocate_default().

Severity

HIGH

CVSS score

7.8 (v3.1)

Vulnerability status

Deferred

Source identifier

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

Published

2025-10-15 08:15:35.400000

Last modified

2026-10-19 21:10:00.160000

View original CVE JSON

{
  "id": "CVE-2025-39976",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2025-10-15T08:15:35.400",
  "lastModified": "2026-10-19T21:10:00.160",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfutex: Use correct exit on failure from futex_hash_allocate_default()\n\ncopy_process() uses the wrong error exit path from futex_hash_allocate_default().\nAfter exiting from futex_hash_allocate_default(), neither tasklist_lock\nnor siglock has been acquired. The exit label bad_fork_core_free unlocks\nboth of these locks which is wrong.\n\nThe next exit label, bad_fork_cancel_cgroup, is the correct exit.\nsched_cgroup_fork() did not allocate any resources that need to freed.\n\nUse bad_fork_cancel_cgroup on error exit from futex_hash_allocate_default()."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nfutex: Usar la salida correcta en caso de fallo de futex_hash_allocate_default()\n\ncopy_process() utiliza la ruta de salida de error incorrecta de futex_hash_allocate_default(). Después de salir de futex_hash_allocate_default(), ni tasklist_lock ni siglock han sido adquiridos. La etiqueta de salida bad_fork_core_free desbloquea ambos de estos bloqueos, lo cual es incorrecto.\n\nLa siguiente etiqueta de salida, bad_fork_cancel_cgroup, es la salida correcta. sched_cgroup_fork() no asignó ningún recurso que necesite ser liberado.\n\nUsar bad_fork_cancel_cgroup en la salida de error de futex_hash_allocate_default()."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "kernel/fork.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "7c4f75a21f636486d2969d9b6680403ea8483539",
              "lessThan": "f1635765cd0fdbf27b04d9a50be91a01b5adda13",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "7c4f75a21f636486d2969d9b6680403ea8483539",
              "lessThan": "4ec3c15462b9f44562f45723a92e2807746ba7d1",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "kernel/fork.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6.16",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "6.16",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.16.10",
              "lessThanOrEqual": "6.16.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.17",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9
      }
    ]
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/4ec3c15462b9f44562f45723a92e2807746ba7d1",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f1635765cd0fdbf27b04d9a50be91a01b5adda13",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}