FKIE_CVE-2026-97950

Vulnerability from fkie_nvd - Published: 2026-09-25 11:17 - Updated: 2026-09-25 11:17
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4f54beb2e7f6d399396466682fba3539bcdcb414
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a7c1290eef60711c10289c056ad32ed1f2b47b12
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d47c5de1cd6bfbe1067fc310bf90e4e00205e839
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "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": "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": "6.18.*",
              "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-rc3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-97950",
  "lastModified": "2026-09-25T11:17:22.567",
  "metrics": {},
  "published": "2026-09-25T11:17:22.567",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4f54beb2e7f6d399396466682fba3539bcdcb414"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a7c1290eef60711c10289c056ad32ed1f2b47b12"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d47c5de1cd6bfbe1067fc310bf90e4e00205e839"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.