EIP-2026-102558

PRE-CVE

AppArmor securityfs < 4.8 - 'aa_fs_seq_hash_show' Reference Count Leak

Title source: legacy
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for EIP-2026-102558. PoCs published by Google Security Research.

AI-analyzed exploit summary This exploit demonstrates a reference count leak in the AppArmor subsystem of the Linux kernel, leading to a use-after-free vulnerability. The PoC triggers the issue by rapidly increasing the reference count of an aa_label object and then forcing its release, causing a kernel crash or potential privilege escalation.

Description

AppArmor securityfs < 4.8 - 'aa_fs_seq_hash_show' Reference Count Leak

Exploits (1)

exploitdb WORKING POC VERIFIED
by Google Security Research · cdoslinux
https://www.exploit-db.com/exploits/40181

This exploit demonstrates a reference count leak in the AppArmor subsystem of the Linux kernel, leading to a use-after-free vulnerability. The PoC triggers the issue by rapidly increasing the reference count of an aa_label object and then forcing its release, causing a kernel crash or potential privilege escalation.

Classification
Working Poc 95%
Attack Type
Lpe
Complexity
Moderate
Reliability
Reliable
Target: Linux kernel 4.2.0.35 with AppArmor (Ubuntu 15.10)
No auth needed
Prerequisites: Access to a vulnerable Linux kernel with AppArmor enabled · Ability to open and read files in /sys/kernel/security/apparmor/
devstral-2 · analyzed Feb 16, 2026 Full analysis →

Details

Status pre_cve
Tracked Since Feb 18, 2026