TI-2026-75671 Aliases CVE-2026-98543 GHSA-mhp5-jj6j-c7m7

Missing inode lock in Linux kernel BPF xattr path hooks

LOW 31Published 2026-10-18 · Updated 2026-10-24

Key facts

Attack vector: Local
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: None · Low · High
Fix status: Partial Red Hat: 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

The Linux kernel from 6.15 is affected. A sleepable BPF LSM program attached to the path_unlink or path_rmdir hook changes a victim inode's extended attributes without holding the inode lock, because the verifier keeps the locked variants of the xattr helpers. The flaw is reachable by a local attacker with low privileges and can affect integrity and availability.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

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.

Why it matters now

EPSS 0.00154 4th percentileScored 2026-11-07

Fix Partial Linux (Linux): 6.18.55, 7.2.9, 7.3Red Hat: 1 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Linux	Linux	6.15 and later	6.18.55, 7.2.9, 7.3	Patch available	CNA

Linux VendorLinux Affected 6.15 and later Fixed in 6.18.55, 7.2.9, 7.3 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:o:linux:linux_kernel::::::::	—	—	Linux

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions — — ·Linux

Remediation

The Linux kernel is fixed in 6.18.55, 7.2.9 and 7.3. The sources list no fixed version for Red Hat Enterprise Linux 10.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Fix · CNA Linux (Linux) Fixed in 6.18.55, 7.2.9, 7.3

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux 10	Affected	No fix yet: Fix deferred

Not affected: 6 products

Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9
Red Hat OpenShift Container Platform 4
Red Hat OpenShift Container Platform 5

Timeline

2026-10-18 Threatist record created from CVE-2026-98543
2026-10-18 Alias added: GHSA-mhp5-jj6j-c7m7
2026-10-19 Fix available: Linux/[email protected] · CNA
2026-10-20 Affected versions changed · Red Hat
2026-10-20 CVSS score added · Red Hat
2026-10-24 CVSS score added · CNA
2026-10-30 Affected versions changed · Red Hat

References

Other 3

TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
TI-2021-02452 Incorrect authorization in Ubuntu linux kernel KEVCVSS 3.1HIGH 8.8
TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4

See all 21741 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences