#VU119701 Use-after-free in Linux kernel - CVE-2023-53821
Published: December 10, 2025 / Updated: December 12, 2025
Vulnerability identifier: #VU119701
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-2023-53821
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 vti6_tnl_xmit() function in net/ipv6/ip6_vti.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/0f0ab8d52ee0062b28367dea23c29e254a26d7db
- https://git.kernel.org/stable/c/55ad2309205cc00c585344374c7472420e1b2c12
- https://git.kernel.org/stable/c/9fd41f1ba638938c9a1195d09bc6fa3be2712f25
- https://git.kernel.org/stable/c/a1639a82ce14af76b6419778d343ccbff86ee626
- https://git.kernel.org/stable/c/c070688bfbe7759e61e697e421b2a331b0dd74bc
- https://git.kernel.org/stable/c/eb47e612e59c358c3968a92f90dd36c78c9a2106
- https://git.kernel.org/stable/c/ec23b25e5687dbd644c0f57bcb6af22dd5a6dd36
- https://git.kernel.org/stable/c/fa6c6c04f6c9b21b315023f487e5a07ae7fcf647
- https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.293