SB2025121069 - Use-after-free in Linux kernel ipv6
Published: December 10, 2025 Updated: December 12, 2025
Security Bulletin ID
SB2025121069
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-2023-53821)
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 website.
References
- 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