Buffer overflow in Linux kernel - CVE-2021-47040
Published: June 8, 2024 / Updated: May 13, 2025
Vulnerability identifier: #VU91439
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-2021-47040
CWE-ID: CWE-119
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 memory corruption within the io_remove_buffers() and io_provide_buffers_prep() functions in fs/io_uring.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/cbbc13b115b8f18e0a714d89f87fbdc499acfe2d
- https://git.kernel.org/stable/c/51bf90901952aaac564bbdb36b2b503050c53dd9
- https://git.kernel.org/stable/c/84b8c266c4bfe9ed5128e13253c388deb74b1b03
- https://git.kernel.org/stable/c/38134ada0ceea3e848fe993263c0ff6207fd46e7
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.37
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.21
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.4
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13