{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "56467292794b800164df20c076c409ac548e56ec"
            },
            {
              "fixed": "7504b677c4370c9e4b153c553ff8831c093b1ff6"
            },
            {
              "fixed": "640d37fbd34d03af727dbc567f48c0203d1de6b4"
            },
            {
              "fixed": "35d442ed1f86465e49df3119fb898f985186db13"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.15.0"
            },
            {
              "fixed": "6.18.55"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98543.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: fs/xattr: don't assume the inode is locked in path_unlink/path_rmdir\n\nbpf_lsm_has_d_inode_locked() makes the verifier rewrite\nbpf_[set|remove]_dentry_xattr() to the _locked variants, which assume\nthat the caller already holds the inode's i_rwsem.  The path_unlink and\npath_rmdir hooks are listed, but security_path_unlink() and\nsecurity_path_rmdir() run before vfs_unlink()/vfs_rmdir() take the\nvictim inode's i_rwsem, so a sleepable BPF LSM program attached to\neither hook mutates the victim's xattrs without the lock held.\n\nDrop the two path hooks from d_inode_locked_hooks so that the verifier\nkeeps the locking bpf_[set|remove]_dentry_xattr() variants, which take\nthe lock themselves.",
  "id": "CVE-2026-98543",
  "modified": "2026-10-19T02:30:15.361862483Z",
  "published": "2026-10-18T15:18:10.823Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/35d442ed1f86465e49df3119fb898f985186db13"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/640d37fbd34d03af727dbc567f48c0203d1de6b4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7504b677c4370c9e4b153c553ff8831c093b1ff6"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98543.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98543"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "bpf: fs/xattr: don't assume the inode is locked in path_unlink/path_rmdir"
}