{"id":"CVE-2026-98543","title":"bpf: fs/xattr: don't assume the inode is locked in path_unlink/path_rmdir","summary":"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 th…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 56467292794b800164df20c076c409ac548e56ec < 7504b677c4370c9e4b153c553ff8831c093b1ff6","Linux >= 56467292794b800164df20c076c409ac548e56ec < 640d37fbd34d03af727dbc567f48c0203d1de6b4","Linux >= 56467292794b800164df20c076c409ac548e56ec < 35d442ed1f86465e49df3119fb898f985186db13","Linux 6.15"],"published":"2026-10-18","updated":"2026-10-18","sourceUpdated":"2026-10-18T15:18:10.823Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98543","references":[{"url":"https://git.kernel.org/stable/c/7504b677c4370c9e4b153c553ff8831c093b1ff6"},{"url":"https://git.kernel.org/stable/c/640d37fbd34d03af727dbc567f48c0203d1de6b4"},{"url":"https://git.kernel.org/stable/c/35d442ed1f86465e49df3119fb898f985186db13"}],"tags":["cve.org"],"ingestedAt":"2026-10-18T15:45:12.266Z","slug":"CVE-2026-98543","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= 56467292794b800164df20c076c409ac548e56ec < 7504b677c4370c9e4b153c553ff8831c093b1ff6`\n- `Linux >= 56467292794b800164df20c076c409ac548e56ec < 640d37fbd34d03af727dbc567f48c0203d1de6b4`\n- `Linux >= 56467292794b800164df20c076c409ac548e56ec < 35d442ed1f86465e49df3119fb898f985186db13`\n- `Linux 6.15`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}