#VU116037 Use-after-free in Linux kernel - CVE-2025-39881
Published: September 23, 2025
Vulnerability identifier: #VU116037
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2025-39881
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
Linux kernel
Linux kernel
Software vendor:
Linux Foundation
Linux Foundation
Description
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 repository.
External links
- 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