A vulnerability in the Linux kernel eventfs subsystem involves improper locking during remount operations that walk eventfs inodes. (CVE-2026-46106)
A vulnerability in the Linux kernel eventfs subsystem involves improper locking during remount operations that walk eventfs inodes. The issue arises because the code only holds an RCU read lock, which is insufficient to prevent races with inode removal and attribute updates. This can lead to use-after-free conditions and potential system instability or denial of service. The vulnerability affects version 3.0 of the affected software.
AI Analysis
Technical Summary
The vulnerability in the Linux kernel eventfs subsystem is due to insufficient locking when remounting and walking eventfs inodes. The code held only an rcu_read_lock(), which does not extend SRCU grace periods, allowing eventfs_inodes to be freed concurrently. Additionally, writes to inode attributes race with other attribute-setting functions that hold eventfs_mutex. This leads to potential use-after-free and memory corruption issues. The fix involves wrapping the events portion of tracefs_apply_options() in locks that include eventfs_mutex and srcu_read_lock to prevent these races.
Potential Impact
The vulnerability can cause use-after-free conditions leading to memory corruption and denial of service (system crash or instability). There is no indication of confidentiality or integrity impact. The attack vector requires local access with low privileges and no user interaction is needed.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Until a patch is available, avoid running remount operations on the eventfs subsystem concurrently with event modifications to reduce the risk of triggering the race condition.
A vulnerability in the Linux kernel eventfs subsystem involves improper locking during remount operations that walk eventfs inodes. (CVE-2026-46106)
Description
A vulnerability in the Linux kernel eventfs subsystem involves improper locking during remount operations that walk eventfs inodes. The issue arises because the code only holds an RCU read lock, which is insufficient to prevent races with inode removal and attribute updates. This can lead to use-after-free conditions and potential system instability or denial of service. The vulnerability affects version 3.0 of the affected software.
CVSS v3.1
Score 5.5medium
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in the Linux kernel eventfs subsystem is due to insufficient locking when remounting and walking eventfs inodes. The code held only an rcu_read_lock(), which does not extend SRCU grace periods, allowing eventfs_inodes to be freed concurrently. Additionally, writes to inode attributes race with other attribute-setting functions that hold eventfs_mutex. This leads to potential use-after-free and memory corruption issues. The fix involves wrapping the events portion of tracefs_apply_options() in locks that include eventfs_mutex and srcu_read_lock to prevent these races.
Potential Impact
The vulnerability can cause use-after-free conditions leading to memory corruption and denial of service (system crash or instability). There is no indication of confidentiality or integrity impact. The attack vector requires local access with low privileges and no user interaction is needed.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Until a patch is available, avoid running remount operations on the eventfs subsystem concurrently with event modifications to reduce the risk of triggering the race condition.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_vex
- Csaf Version
- 2.0
- Publisher
- Microsoft Security Response Center
- Advisory Id
- msrc_CVE-2026-46106
- Cve Count
- 1
- Additional Cves
- []
- Cvss Version
- 3.1
Threat ID: 6a19febee29bf47b500fdfb5
Added to database: 05/29/2026, 21:01:50 UTC
Last enriched: 06/26/2026, 23:37:46 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 65
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