Use-after-free in Linux kernel - CVE-2023-52479

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Main Vulnerability Database Vulnerabilities #VU88818

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: 8.5 [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]
CVE-ID: CVE-2023-52479
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

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.


Affected software

Linux kernel
openEuler
kernel-debugsource
kernel
python3-perf
kernel-debuginfo
perf
kernel-tools-debuginfo
bpftool
kernel-source
kernel-devel
kernel-tools
kernel-tools-devel
bpftool-debuginfo
kernel-headers
python3-perf-debuginfo
perf-debuginfo

How to mitigate CVE-2023-52479

Install updates from vendor's website.

Linux kernel - addressed in versions 5.15.135, 6.1.57, 6.5.7, 6.6
kernel-debugsource - addressed in versions 5.10.0-60.133.0.160, 5.10.0-136.71.0.151, 5.10.0-153.50.0.128, 5.10.0-195.0.0.108
kernel - addressed in versions 5.10.0-60.133.0.160, 5.10.0-136.71.0.151, 5.10.0-153.50.0.128, 5.10.0-195.0.0.108
python3-perf - addressed in versions 5.10.0-60.133.0.160, 5.10.0-136.71.0.151, 5.10.0-153.50.0.128, 5.10.0-195.0.0.108
kernel-debuginfo - addressed in versions 5.10.0-60.133.0.160, 5.10.0-136.71.0.151, 5.10.0-153.50.0.128, 5.10.0-195.0.0.108
perf - addressed in versions 5.10.0-60.133.0.160, 5.10.0-136.71.0.151, 5.10.0-153.50.0.128, 5.10.0-195.0.0.108
kernel-tools-debuginfo - addressed in versions 5.10.0-60.133.0.160, 5.10.0-136.71.0.151, 5.10.0-153.50.0.128, 5.10.0-195.0.0.108
bpftool - update to 5.10.0-60.133.0.160
kernel-source - addressed in versions 5.10.0-60.133.0.160, 5.10.0-136.71.0.151, 5.10.0-153.50.0.128, 5.10.0-195.0.0.108
kernel-devel - addressed in versions 5.10.0-60.133.0.160, 5.10.0-136.71.0.151, 5.10.0-153.50.0.128, 5.10.0-195.0.0.108
kernel-tools - addressed in versions 5.10.0-60.133.0.160, 5.10.0-136.71.0.151, 5.10.0-153.50.0.128, 5.10.0-195.0.0.108
kernel-tools-devel - addressed in versions 5.10.0-60.133.0.160, 5.10.0-136.71.0.151, 5.10.0-153.50.0.128, 5.10.0-195.0.0.108
bpftool-debuginfo - update to 5.10.0-60.133.0.160
kernel-headers - addressed in versions 5.10.0-60.133.0.160, 5.10.0-136.71.0.151, 5.10.0-153.50.0.128, 5.10.0-195.0.0.108
python3-perf-debuginfo - addressed in versions 5.10.0-60.133.0.160, 5.10.0-136.71.0.151, 5.10.0-153.50.0.128, 5.10.0-195.0.0.108
perf-debuginfo - addressed in versions 5.10.0-60.133.0.160, 5.10.0-136.71.0.151, 5.10.0-153.50.0.128, 5.10.0-195.0.0.108

External References

Related Security Bulletins