SB20260815116 - Use-after-free in Linux kernel bpf
Published: August 15, 2026
Security Bulletin ID
SB20260815116
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-2026-74363)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to use-after-free in bpffs inode handling when a concurrent unlinkat() drops the last inode reference during RCU path walking. A local user can trigger concurrent path operations to cause a denial of service.
The issue occurs because inode fields and the cached symlink body may still be accessed during RCU pathwalk after the inode is freed.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/0497ff765746d9b2d17445c8f7cc737b36c0152a
- https://git.kernel.org/stable/c/53649846e0437d1d9b7cb993cfe54c367addf7ae
- https://git.kernel.org/stable/c/5fecb71c10c28aef276ba49c718dc961745fdcf0
- https://git.kernel.org/stable/c/61f19729728243c82476dee31315143ed3275e7f
- https://git.kernel.org/stable/c/b93c55b4932dd7e32dca8cf34a3443cc87a02906
- https://git.kernel.org/stable/c/c70d0f9114c3cc156f6029a400c4eb7e6f7c82b2
- https://git.kernel.org/stable/c/ea1c243c39e32b7fc1c2edfe32081ff7e30a877c