Memory leak in Linux kernel - CVE-2021-47527
Published: May 31, 2024 / Updated: May 14, 2025
Vulnerability identifier: #VU90437
CSH Severity: Low
CVSS v4.0: 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-2021-47527
CWE-ID: CWE-401
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to memory leak within the uart_tty_port_shutdown() function in drivers/tty/serial/serial_core.c. A local user can perform a denial of service (DoS) attack.
How to mitigate CVE-2021-47527
Install update from vendor's website.
Sources
- https://git.kernel.org/stable/c/011f6c92b5bf6e1fbfdedc8b5232f64c1c493206
- https://git.kernel.org/stable/c/e74d9663fd57640fc3394abb5c76fa95b9cc2f2e
- https://git.kernel.org/stable/c/1179b168fa3f3a6aae3bd140000455a0e58457db
- https://git.kernel.org/stable/c/c5da8aa441053958594f94254592bb41264bdfbf
- https://git.kernel.org/stable/c/e1722acf4f0d4d67b60f57e08ce16f8b66cd4b8f
- https://git.kernel.org/stable/c/64e491c1634b73d3bddc081d08620bdc92ab2c12
- https://git.kernel.org/stable/c/00de977f9e0aa9760d9a79d1e41ff780f74e3424
- https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.257
- https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.220
- https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.292
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.84
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.7
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.16
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.164