Use-after-free in Linux kernel - CVE-2023-54243
Published: December 30, 2025 / Updated: December 31, 2025
Vulnerability identifier: #VU120712
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-2023-54243
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 __do_replace() function in net/ipv6/netfilter/ip6_tables.c. A local user can escalate privileges on the system.
How to mitigate CVE-2023-54243
Install update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/3dd6ac973351308d4117eda32298a9f1d68764fd
- https://git.kernel.org/stable/c/9060abce3305ab2354c892c09d5689df51486df5
- https://git.kernel.org/stable/c/cda0e0243bd3c04008fcd37a46b0269fb3c49249
- https://git.kernel.org/stable/c/dbb3cbbf03b3c52cb390fabec357f1e4638004f5
- https://git.kernel.org/stable/c/e58a171d35e32e6e8c37cfe0e8a94406732a331f
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.173
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.100
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.18
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.2.5
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.3