SB2025092364 - Use-after-free in Linux kernel kernfs
Published: September 23, 2025
Security Bulletin ID
SB2025092364
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Use-after-free (CVE-ID: CVE-2025-39881)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the of_on(), kernfs_seq_stop_active(), kernfs_seq_start(), kernfs_file_read_iter(), kernfs_fop_write_iter(), kernfs_vma_open(), kernfs_vma_fault(), kernfs_vma_page_mkwrite(), kernfs_vma_access(), kernfs_fop_mmap() and kernfs_fop_poll() functions in fs/kernfs/file.c. A local user can escalate privileges on the system.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/34d9cafd469c69ad85e6a36b4303c78382cf5c79
- https://git.kernel.org/stable/c/3c9ba2777d6c86025e1ba4186dc5cd930e40ec5f
- https://git.kernel.org/stable/c/7e64474aba78d240f7804f48f2d454dcca78b15f
- https://git.kernel.org/stable/c/854baafc00c433cccbe0ab4231b77aeb9b637b77
- https://git.kernel.org/stable/c/ac5cda4fae8818cf1963317bb699f7f2f85b60af