Use-after-free in Linux kernel - CVE-2021-47281
Published: May 31, 2024 / Updated: May 14, 2025
Vulnerability identifier: #VU90095
CSH Severity: 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-2021-47281
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 snd_seq_timer_open() function in sound/core/seq/seq_timer.c. A local user can escalate privileges on the system.
Remediation
Install update from vendor's website.
External links
- https://git.kernel.org/stable/c/bd7d88b0874f82f7b29d1a53e574cedaf23166ba
- https://git.kernel.org/stable/c/536a7646c00a0f14fee49e5e313109e5da2f6031
- https://git.kernel.org/stable/c/83e197a8414c0ba545e7e3916ce05f836f349273
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.44
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.11
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13