Dashboard / CVE-2026-98543

CVE-2026-98543

HIGH
MEDIUM Priority: 0.01 BB Relevance: 40/100
Published: 2026-10-18 Modified: 2026-10-24 First seen: 2026-10-29 Status: active

Attack Surface

Low Complexity No Interaction Scope Change

CVSS Vector Breakdown

AV: Local
AC: Low
PR: Low
UI: None
S: Changed
C: None
I: Low
A: High

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.

References & Advisories (3)

Bug Bounty Relevance

40 / 100
✓ Low complexity
✓ No user interaction

CVSS Score

7.3 / 10.0 v3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H

EPSS — Exploitation Probability

0.15%
Raw Score 0.001540
Percentile 4.6%
Date 2026-11-06

EPSS Trend

2026-11-06
0.00154
2026-11-05
0.00154
2026-11-04
0.00154
2026-11-03
0.00154
2026-11-02
0.00154
2026-11-01
0.00154
2026-10-31
0.00154
2026-10-30
0.00154
2026-10-29
0.00154
2026-10-28
0.00154

Intelligence Sources

nvd ref →

External Links