CVE-2026-97950

Full vulnerability record from the local CVENow database.

Description

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.

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-09-25 11:17:22.567000

Last modified

2026-10-21 13:21:17.320000

View original CVE JSON

{
  "id": "CVE-2026-97950",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-25T11:17:22.567",
  "lastModified": "2026-10-21T13:21:17.320",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nconfigfs: pin the symlink target's dirent instead of chasing ->ci_dentry\n\ncreate_link() reads the target's configfs_dirent from\nitem->ci_dentry->d_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 ->ci_dentry freed and its dirent\nreleased, triggering WARN_ON(!atomic_read(&sd->s_count)) in configfs_get().\n\nTake the dirent in get_target() as well, under ->d_lock and atomically\nwith the item reference, and pass it down to create_link().  A hashed\ndentry has not been killed yet, so its ->d_fsdata reference keeps the\ndirent alive there."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "fs/configfs/symlink.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "7063fbf2261194f72ee75afca67b3b38b554b5fa",
              "lessThan": "a44744454eafbc158e8c8e3ef8d207076410b195",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "7063fbf2261194f72ee75afca67b3b38b554b5fa",
              "lessThan": "846ff40fd57a47e59a41f4e331ec3b34efaddc23",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "7063fbf2261194f72ee75afca67b3b38b554b5fa",
              "lessThan": "4f54beb2e7f6d399396466682fba3539bcdcb414",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "7063fbf2261194f72ee75afca67b3b38b554b5fa",
              "lessThan": "d47c5de1cd6bfbe1067fc310bf90e4e00205e839",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "7063fbf2261194f72ee75afca67b3b38b554b5fa",
              "lessThan": "a7c1290eef60711c10289c056ad32ed1f2b47b12",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "fs/configfs/symlink.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "2.6.16",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "2.6.16",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.160",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.112",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.53",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.7",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/4f54beb2e7f6d399396466682fba3539bcdcb414",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/846ff40fd57a47e59a41f4e331ec3b34efaddc23",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a44744454eafbc158e8c8e3ef8d207076410b195",
      "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",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}