{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "249ebf3f65f8530beb2cbfb91bff1d83ba88d23c"
            },
            {
              "fixed": "ba0b9f04c7a5f9887b8ce672eaf049502c0548ec"
            },
            {
              "fixed": "e91df6d273445c03f5aa302bfe147eda33d45794"
            },
            {
              "fixed": "73569a44fca2992f0ca4a4c0104069741b9873a0"
            },
            {
              "fixed": "257595adf9dac15ae1edd9d07753fbc576a7583d"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.11.0"
            },
            {
              "fixed": "6.12.95"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.38"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64251.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\npwrseq: core: fix use-after-free in pwrseq_debugfs_seq_next()\n\npwrseq_debugfs_seq_next() declares 'next' with __free(put_device),\nwhich causes put_device() to be called on the returned pointer when\nthe variable goes out of scope.  This results in a use-after-free\nsince the seq_file framework receives a pointer whose reference has\nalready been dropped.\n\nSimply removing __free(put_device) would fix the UAF but would leak\nthe reference acquired by bus_find_next_device(), as stop() only\ncalls up_read(\u0026pwrseq_sem) and never releases the device reference.\n\nFix this by making the reference counting consistent across all\nseq_file callbacks, matching the standard pattern used by PCI and\nSCSI:\n\n- start(): use get_device() so it returns a referenced pointer.\n- next(): explicitly put_device(curr) to release the previous\n  device's reference (no NULL check needed - the seq_file framework\n  only calls next() while the previous return was non-NULL).\n- stop(): put_device(data) to release the last iterated device's\n  reference, with a NULL guard since stop() may be called with NULL\n  when start() returned NULL or next() reached end-of-sequence.",
  "id": "CVE-2026-64251",
  "modified": "2026-07-27T03:56:25.468364313Z",
  "published": "2026-07-24T15:31:17.601Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/257595adf9dac15ae1edd9d07753fbc576a7583d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/73569a44fca2992f0ca4a4c0104069741b9873a0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ba0b9f04c7a5f9887b8ce672eaf049502c0548ec"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e91df6d273445c03f5aa302bfe147eda33d45794"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64251.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64251"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "summary": "pwrseq: core: fix use-after-free in pwrseq_debugfs_seq_next()"
}