#VU91528 Improper locking in Linux kernel - CVE-2021-47185
Published: June 8, 2024 / Updated: May 13, 2025
Vulnerability identifier: #VU91528
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2021-47185
CWE-ID: CWE-667
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 perform a denial of service (DoS) attack.
The vulnerability exists due to improper locking within the flush_to_ldisc() function in drivers/tty/tty_buffer.c. A local user can perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.
External links
- https://git.kernel.org/stable/c/0380f643f3a7a61b0845cdc738959c2ad5735d61
- https://git.kernel.org/stable/c/b1ffc16ec05ae40d82b6e373322d62e9d6b54fbc
- https://git.kernel.org/stable/c/4c1623651a0936ee197859824cdae6ebbd04d3ed
- https://git.kernel.org/stable/c/4f300f47dbcf9c3d4b2ea76c8554c8f360400725
- https://git.kernel.org/stable/c/d491c84df5c469dd9621863b6a770b3428137063
- https://git.kernel.org/stable/c/77e9fed33056f2a88eba9dd4d2d5412f0c7d1f41
- https://git.kernel.org/stable/c/5c34486f04700f1ba04907231dce0cc2705c2d7d
- https://git.kernel.org/stable/c/3968ddcf05fb4b9409cd1859feb06a5b0550a1c1
- https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.256
- https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.218
- https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.293
- https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.291
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.82
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.5
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.16
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.162