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CVE-2026-98543

7.3 · HIGH

In the Linux kernel, the following vulnerability has been resolved: bpf: fs/xattr: don't assume the inode is locked in path_unlink/path_rmdir bpf_lsm_has_d_inode_locked() makes the verifier rewri…

Published Oct 18, 2026EPSS 0.15%

Overview

CVE-2026-98543 is a high-severity vulnerability. It was published on October 18, 2026 and has a CVSS 3.1 base score of 7.3 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.3, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

bpf: fs/xattr: don't assume the inode is locked in path_unlink/path_rmdir

bpf_lsm_has_d_inode_locked() makes the verifier rewrite

bpf_[set|remove]_dentry_xattr() to the _locked variants, which assume

that the caller already holds the inode's i_rwsem. The path_unlink and

path_rmdir hooks are listed, but security_path_unlink() and

security_path_rmdir() run before vfs_unlink()/vfs_rmdir() take the

victim inode's i_rwsem, so a sleepable BPF LSM program attached to

either hook mutates the victim's xattrs without the lock held.

Drop the two path hooks from d_inode_locked_hooks so that the verifier

keeps the locking bpf_[set|remove]_dentry_xattr() variants, which take

the lock themselves.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/35d442ed1f86465e49df3119fb898f985186db13Refgit.kernel.org/stable/c/640d37fbd34d03af727dbc567f48c0203d1de6b4Refgit.kernel.org/stable/c/7504b677c4370c9e4b153c553ff8831c093b1ff6

How CyberStrike helps

Frequently asked questions

What is CVE-2026-98543?

CVE-2026-98543 is a high-severity vulnerability. It was published on October 18, 2026 and has a CVSS 3.1 base score of 7.3 (HIGH).

How severe is CVE-2026-98543?

This vulnerability has a CVSS 3.1 base score of 7.3, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-98543?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-98543?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-98543 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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