Use-after-free in Linux kernel - CVE-2025-21999
Published: April 3, 2025 / Updated: May 11, 2025
Vulnerability identifier: #VU106955
CSH Severity: Low
CVSS v4.0: 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-2025-21999
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability 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 proc_get_inode() function in fs/proc/inode.c, within the proc_create_reg(), proc_create_seq_private() and proc_create_single_data() functions in fs/proc/generic.c. A local user can escalate privileges on the system.
How to mitigate CVE-2025-21999
Install update from vendor's website.
Sources
- https://git.kernel.org/stable/c/63b53198aff2e4e6c5866a4ff73c7891f958ffa4
- https://git.kernel.org/stable/c/64dc7c68e040251d9ec6e989acb69f8f6ae4a10b
- https://git.kernel.org/stable/c/654b33ada4ab5e926cd9c570196fefa7bec7c1df
- https://git.kernel.org/stable/c/966f331403dc3ed04ff64eaf3930cf1267965e53
- https://git.kernel.org/stable/c/ede3e8ac90ae106f0b29cd759aadebc1568f1308
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.21