FKIE_CVE-2025-39976

Vulnerability from fkie_nvd - Published: 2025-10-15 08:15 - Updated: 2026-06-17 09:18
Severity
Summary
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().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4ec3c15462b9f44562f45723a92e2807746ba7d1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f1635765cd0fdbf27b04d9a50be91a01b5adda13
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/fork.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "f1635765cd0fdbf27b04d9a50be91a01b5adda13",
              "status": "affected",
              "version": "7c4f75a21f636486d2969d9b6680403ea8483539",
              "versionType": "git"
            },
            {
              "lessThan": "4ec3c15462b9f44562f45723a92e2807746ba7d1",
              "status": "affected",
              "version": "7c4f75a21f636486d2969d9b6680403ea8483539",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/fork.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
              "lessThan": "6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17",
              "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\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()."
    }
  ],
  "id": "CVE-2025-39976",
  "lastModified": "2026-06-17T09:18:56.610",
  "metrics": {},
  "published": "2025-10-15T08:15:35.400",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4ec3c15462b9f44562f45723a92e2807746ba7d1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f1635765cd0fdbf27b04d9a50be91a01b5adda13"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}


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