Memory leak in Linux kernel - CVE-2021-47342
Published: May 30, 2024 / Updated: May 14, 2025
Vulnerability identifier: #VU89961
CSH Severity: Low
CVSS v4: 6.8 [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]
CVE-ID: CVE-2021-47342
CWE-ID: CWE-401
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to memory leak within the ext4_remount() function in fs/ext4/super.c, within the kmmpd() and brelse() functions in fs/ext4/mmp.c. A local user can perform a denial of service (DoS) attack.
Affected software
Linux kernel
How to mitigate CVE-2021-47342
Install update from vendor's website.
Linux kernel - addressed in versions 5.10.77, 5.13.3, 5.14
External References
- https://git.kernel.org/stable/c/b663890d854403e566169f7e90aed5cd6ff64f6b
- https://git.kernel.org/stable/c/7ed572cdf11081f8f9e07abd4bea56a3f2c4edbd
- https://git.kernel.org/stable/c/61bb4a1c417e5b95d9edb4f887f131de32e419cb
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.77
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.3
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14