configfs: pin the symlink target's dirent instead of chasing ->ci_dentry

{
  "id": "edd854c70d4e86389dcb0ce53c9e6e78a775ce79b795ad1672632bef94128388",
  "url": "https://osv.dev/vulnerability/CVE-2026-97950",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "configfs: pin the symlink target's dirent instead of chasing ->ci_dentry",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: configfs: pin the symlink target's dirent instead of chasing ->ci_dentry create_link() reads the target's configfs_dirent from item->ci_dentry->d_fsdata, relying on the item reference taken by get_target(). That reference pins the item, not its dentry: the dentry is pinned by DCACHE_PERSISTENT, which configfs_remove_dir() releases via simple_rmdir() while the item is still alive. A symlink racing with rmdir of its target can therefore find ->ci_dentry freed and its dirent released, triggering WARN_ON(!atomic_read(&sd->s_count)) in configfs_get(). Take the dirent in get_target() as well, under ->d_lock and atomically with the item reference, and pass it down to create_link(). A hashed dentry has not been killed yet, so its ->d_fsdata reference keeps the dirent alive there.",
    "evidence": "osv:CVE-2026-97950",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.160",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.112",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.53",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.7",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-97950",
      "aliases": [
        "CVE-2026-97950"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "7063fbf2261194f72ee75afca67b3b38b554b5fa"
                },
                {
                  "fixed": "a44744454eafbc158e8c8e3ef8d207076410b195"
                },
                {
                  "fixed": "846ff40fd57a47e59a41f4e331ec3b34efaddc23"
                },
                {
                  "fixed": "4f54beb2e7f6d399396466682fba3539bcdcb414"
                },
                {
                  "fixed": "d47c5de1cd6bfbe1067fc310bf90e4e00205e839"
                },
                {
                  "fixed": "a7c1290eef60711c10289c056ad32ed1f2b47b12"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-97950.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "2.6.16"
                },
                {
                  "fixed": "6.6.160"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.112"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.53"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.7"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-97950.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:38.514041217Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/4f54beb2e7f6d399396466682fba3539bcdcb414",
        "https://git.kernel.org/stable/c/846ff40fd57a47e59a41f4e331ec3b34efaddc23",
        "https://git.kernel.org/stable/c/a44744454eafbc158e8c8e3ef8d207076410b195",
        "https://git.kernel.org/stable/c/a7c1290eef60711c10289c056ad32ed1f2b47b12",
        "https://git.kernel.org/stable/c/d47c5de1cd6bfbe1067fc310bf90e4e00205e839",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97950.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-97950",
        "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/2026/97xxx/CVE-2026-97950.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-97950",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 505928,
  "published_at": "2026-09-25T10:22:58.97+00:00"
}