fsnotify: Fix ordering of iput() and watched_objects decrement

{
  "id": "c800f0367f1d510a5672cc7190653004726ef01b66b8e205daff425c35d590b0",
  "url": "https://osv.dev/vulnerability/CVE-2024-53143",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "fsnotify: Fix ordering of iput() and watched_objects decrement",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: fsnotify: Fix ordering of iput() and watched_objects decrement Ensure the superblock is kept alive until we're done with iput(). Holding a reference to an inode is not allowed unless we ensure the superblock stays alive, which fsnotify does by keeping the watched_objects count elevated, so iput() must happen before the watched_objects decrement. This can lead to a UAF of something like sb->s_fs_info in tmpfs, but the UAF is hard to hit because race orderings that oops are more likely, thanks to the CHECK_DATA_CORRUPTION() block in generic_shutdown_super(). Also, ensure that fsnotify_put_sb_watched_objects() doesn't call fsnotify_sb_watched_objects() on a superblock that may have already been freed, which would cause a UAF read of sb->s_fsnotify_info.",
    "evidence": "osv:CVE-2024-53143",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.11.11",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.2",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2024-53143",
      "aliases": [
        "CVE-2024-53143"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "d2f277e26f521ccf6fb438463b41dba6123caabe"
                },
                {
                  "fixed": "45a8f8232a495221ed058191629f5c628f21601a"
                },
                {
                  "fixed": "83af1cfa10d9aafdabd06b3655e07727f373b434"
                },
                {
                  "fixed": "21d1b618b6b9da46c5116c640ac4b1cc8d40d63a"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-53143.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.10.0"
                },
                {
                  "fixed": "6.11.11"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.12.0"
                },
                {
                  "fixed": "6.12.2"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-53143.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:24.203408734Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/21d1b618b6b9da46c5116c640ac4b1cc8d40d63a",
        "https://git.kernel.org/stable/c/45a8f8232a495221ed058191629f5c628f21601a",
        "https://git.kernel.org/stable/c/83af1cfa10d9aafdabd06b3655e07727f373b434",
        "https://project-zero.issues.chromium.org/issues/379667898",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/53xxx/CVE-2024-53143.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-53143",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/53xxx/CVE-2024-53143.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-53143",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 490317,
  "published_at": "2024-12-07T06:40:43.522+00:00"
}