#VU90139 Use-after-free in Linux kernel - CVE-2021-47379
Published: May 31, 2024 / Updated: May 14, 2025
Vulnerability identifier: #VU90139
Vulnerability risk: 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-2021-47379
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 spin_lock_irq() and blkcg_deactivate_policy() functions in block/blk-cgroup.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/d12ddd843f1877de1f7dd2aeea4907cf9ff3ac08
- https://git.kernel.org/stable/c/f58d305887ad7b24986d58e881f6806bb81b2bdf
- https://git.kernel.org/stable/c/7c2c69e010431b0157c9454adcdd2305809bf9fb
- https://git.kernel.org/stable/c/858560b27645e7e97aca37ee8f232cccd658fbd2
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.70
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.9
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.150