Use-after-free in Linux kernel - CVE-2023-52479
Published: April 18, 2024 / Updated: May 14, 2025
Vulnerability identifier: #VU88818
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-2023-52479
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 smb20_oplock_break_ack() function in fs/ksmbd/smb2pdu.c and fs/smb/server/smb2pdu.c. A local user can trigger a use-after-free error and escalate privileges on the system.
How to mitigate CVE-2023-52479
Install updates from vendor's website.
Sources
- https://git.kernel.org/stable/c/694e13732e830cbbfedb562e57f28644927c33fd
- https://git.kernel.org/stable/c/8226ffc759ea59f10067b9acdf7f94bae1c69930
- https://git.kernel.org/stable/c/d5b0e9d3563e7e314a850e81f42b2ef6f39882f9
- https://git.kernel.org/stable/c/c69813471a1ec081a0b9bf0c6bd7e8afd818afce
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.135
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.57
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.5.7
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6