cachefiles: Fix double unlock in nomem_d_alloc error path

{
  "id": "882c8d735009d4e118021d1e7b3143451a0cc2fd613a5996b5c580a6f7a32013",
  "url": "https://osv.dev/vulnerability/CVE-2026-72368",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "cachefiles: Fix double unlock in nomem_d_alloc error path",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: cachefiles: Fix double unlock in nomem_d_alloc error path When start_creating() fails and returns -ENOMEM, it has already released the parent directory lock in __start_dirop(): static struct dentry *__start_dirop(...) { ... inode_lock_nested(dir, I_MUTEX_PARENT); dentry = lookup_one_qstr_excl(name, parent, lookup_flags); if (IS_ERR(dentry)) inode_unlock(dir); <-- Lock released on error return dentry; } However, the nomem_d_alloc error path in cachefiles_get_directory() unconditionally calls inode_unlock(d_inode(dir)) again, causing a double unlock that corrupts the rwsem state. This is a leftover from commit 7ab96df840e60 which replaced manual locking with start_creating() but failed to update the nomem_d_alloc path (while correctly updating mkdir_error and lookup_error paths).",
    "evidence": "osv:CVE-2026-72368",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "7.1.5",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-72368",
      "aliases": [
        "CVE-2026-72368"
      ],
      "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": [
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                  "introduced": "7ab96df840e60eb933abfe65fc5fe44e72f16dc0"
                },
                {
                  "fixed": "26757dac15175f2a42e3537f1ba86e62456d48f1"
                },
                {
                  "fixed": "8c256fba2b46020004201c500b2a1fbc707a33ef"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72368.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.1.5"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72368.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:30.469632392Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/26757dac15175f2a42e3537f1ba86e62456d48f1",
        "https://git.kernel.org/stable/c/8c256fba2b46020004201c500b2a1fbc707a33ef",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72368.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-72368",
        "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/2026/72xxx/CVE-2026-72368.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-72368",
        "evidence": "/id"
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    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497381,
  "published_at": "2026-08-15T05:56:05.329+00:00"
}