SB20261029141 - Use-after-free in Linux kernel tracefs
Published: October 29, 2026
Security Bulletin ID
SB20261029141
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-99173)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to potentially cause a denial of service.
The vulnerability exists due to a use-after-free in eventfs inode lifetime management when an SRCU grace period permits an inode to be freed before an ongoing RCU path walk completes. A local user can trigger overlapping path lookups and dentry teardown to potentially cause a denial of service when tracefs_d_revalidate() reads the freed inode's is_freed field.
Remediation
Install update from vendor's website.