CVE-2026-97950 (GCVE-0-2026-97950)
Vulnerability from cvelistv5
Published
2026-09-25 10:22
Modified
2026-10-21 12:53
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 7063fbf2261194f72ee75afca67b3b38b554b5fa
Version: 7063fbf2261194f72ee75afca67b3b38b554b5fa
Version: 7063fbf2261194f72ee75afca67b3b38b554b5fa
Version: 7063fbf2261194f72ee75afca67b3b38b554b5fa
Version: 7063fbf2261194f72ee75afca67b3b38b554b5fa
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/configfs/symlink.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a44744454eafbc158e8c8e3ef8d207076410b195",
              "status": "affected",
              "version": "7063fbf2261194f72ee75afca67b3b38b554b5fa",
              "versionType": "git"
            },
            {
              "lessThan": "846ff40fd57a47e59a41f4e331ec3b34efaddc23",
              "status": "affected",
              "version": "7063fbf2261194f72ee75afca67b3b38b554b5fa",
              "versionType": "git"
            },
            {
              "lessThan": "4f54beb2e7f6d399396466682fba3539bcdcb414",
              "status": "affected",
              "version": "7063fbf2261194f72ee75afca67b3b38b554b5fa",
              "versionType": "git"
            },
            {
              "lessThan": "d47c5de1cd6bfbe1067fc310bf90e4e00205e839",
              "status": "affected",
              "version": "7063fbf2261194f72ee75afca67b3b38b554b5fa",
              "versionType": "git"
            },
            {
              "lessThan": "a7c1290eef60711c10289c056ad32ed1f2b47b12",
              "status": "affected",
              "version": "7063fbf2261194f72ee75afca67b3b38b554b5fa",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/configfs/symlink.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.16"
            },
            {
              "lessThan": "2.6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.160",
                  "versionStartIncluding": "2.6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.112",
                  "versionStartIncluding": "2.6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.53",
                  "versionStartIncluding": "2.6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.7",
                  "versionStartIncluding": "2.6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "2.6.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nconfigfs: pin the symlink target\u0027s dirent instead of chasing -\u003eci_dentry\n\ncreate_link() reads the target\u0027s configfs_dirent from\nitem-\u003eci_dentry-\u003ed_fsdata, relying on the item reference taken by\nget_target().  That reference pins the item, not its dentry: the dentry is\npinned by DCACHE_PERSISTENT, which configfs_remove_dir() releases via\nsimple_rmdir() while the item is still alive.  A symlink racing with rmdir\nof its target can therefore find -\u003eci_dentry freed and its dirent\nreleased, triggering WARN_ON(!atomic_read(\u0026sd-\u003es_count)) in configfs_get().\n\nTake the dirent in get_target() as well, under -\u003ed_lock and atomically\nwith the item reference, and pass it down to create_link().  A hashed\ndentry has not been killed yet, so its -\u003ed_fsdata reference keeps the\ndirent alive there."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:53:48.740Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a44744454eafbc158e8c8e3ef8d207076410b195"
        },
        {
          "url": "https://git.kernel.org/stable/c/846ff40fd57a47e59a41f4e331ec3b34efaddc23"
        },
        {
          "url": "https://git.kernel.org/stable/c/4f54beb2e7f6d399396466682fba3539bcdcb414"
        },
        {
          "url": "https://git.kernel.org/stable/c/d47c5de1cd6bfbe1067fc310bf90e4e00205e839"
        },
        {
          "url": "https://git.kernel.org/stable/c/a7c1290eef60711c10289c056ad32ed1f2b47b12"
        }
      ],
      "title": "configfs: pin the symlink target\u0027s dirent instead of chasing -\u003eci_dentry",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-97950",
    "datePublished": "2026-09-25T10:22:58.970Z",
    "dateReserved": "2026-09-25T10:18:58.205Z",
    "dateUpdated": "2026-10-21T12:53:48.740Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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