FKIE_CVE-2026-97949

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: unhash the dentry before dropping the item in rmdir configfs_get_config_item() treats a hashed dentry as proof that sd->s_element is a live config_item. configfs_rmdir() breaks that: simple_rmdir() leaves the dentry hashed, the last reference to the item is dropped right after, and the dentry is only unhashed by d_delete() once ->rmdir() has returned. configfs_symlink() resolves its target holding no lock on it, so get_target() can land in that window: BUG: KASAN: slab-use-after-free in config_item_get+0x26/0x90 get_target fs/configfs/symlink.c:128 [inline] configfs_symlink+0x4ab/0x1030 fs/configfs/symlink.c:185 Unhash in configfs_remove_dir(), while the item is still guaranteed to be there. A reference obtained just before that stays harmless, as create_link() rechecks CONFIGFS_USET_DROPPING, already set by configfs_detach_prep(). Both configfs_unregister_subsystem() paths d_drop() after detaching, so this only makes rmdir match them.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5d7cbfb65e47cc71d5d94d87d5d0d1679080f3eb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/925d8564f1b2d9b46c5ab63b9bc942cea006da9b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f06c2d26d1999d37e93299db0ecead04ca7d0b9f
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/configfs/dir.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "5d7cbfb65e47cc71d5d94d87d5d0d1679080f3eb",
              "status": "affected",
              "version": "7063fbf2261194f72ee75afca67b3b38b554b5fa",
              "versionType": "git"
            },
            {
              "lessThan": "925d8564f1b2d9b46c5ab63b9bc942cea006da9b",
              "status": "affected",
              "version": "7063fbf2261194f72ee75afca67b3b38b554b5fa",
              "versionType": "git"
            },
            {
              "lessThan": "f06c2d26d1999d37e93299db0ecead04ca7d0b9f",
              "status": "affected",
              "version": "7063fbf2261194f72ee75afca67b3b38b554b5fa",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/configfs/dir.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: unhash the dentry before dropping the item in rmdir\n\nconfigfs_get_config_item() treats a hashed dentry as proof that\nsd-\u003es_element is a live config_item.  configfs_rmdir() breaks that:\nsimple_rmdir() leaves the dentry hashed, the last reference to the item is\ndropped right after, and the dentry is only unhashed by d_delete() once\n-\u003ermdir() has returned.  configfs_symlink() resolves its target holding no\nlock on it, so get_target() can land in that window:\n\n  BUG: KASAN: slab-use-after-free in config_item_get+0x26/0x90\n   get_target fs/configfs/symlink.c:128 [inline]\n   configfs_symlink+0x4ab/0x1030 fs/configfs/symlink.c:185\n\nUnhash in configfs_remove_dir(), while the item is still guaranteed to be\nthere.  A reference obtained just before that stays harmless, as\ncreate_link() rechecks CONFIGFS_USET_DROPPING, already set by\nconfigfs_detach_prep().  Both configfs_unregister_subsystem() paths\nd_drop() after detaching, so this only makes rmdir match them."
    }
  ],
  "id": "CVE-2026-97949",
  "lastModified": "2026-09-25T11:17:22.453",
  "metrics": {},
  "published": "2026-09-25T11:17:22.453",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5d7cbfb65e47cc71d5d94d87d5d0d1679080f3eb"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/925d8564f1b2d9b46c5ab63b9bc942cea006da9b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f06c2d26d1999d37e93299db0ecead04ca7d0b9f"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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