Memory leak in Linux kernel - CVE-2021-46968
Published: May 31, 2024 / Updated: May 14, 2025
Vulnerability identifier: #VU90485
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-2021-46968
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 zcrypt_queue_unregister() function in drivers/s390/crypto/zcrypt_queue.c, within the zcrypt_card_unregister() function in drivers/s390/crypto/zcrypt_card.c. A local user can perform a denial of service (DoS) attack.
Affected software
Linux kernel
How to mitigate CVE-2021-46968
Install update from vendor's website.
Linux kernel - addressed in versions 5.10.36, 5.11.20, 5.12.3, 5.13
External References
- https://git.kernel.org/stable/c/026499a9c2e002e621ad568d1378324ae97e5524
- https://git.kernel.org/stable/c/055a063a18bcd19b93709e3eac8078d6b2f04599
- https://git.kernel.org/stable/c/971dc8706cee47393d393905d294ea47e39503d3
- https://git.kernel.org/stable/c/70fac8088cfad9f3b379c9082832b4d7532c16c2
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.36
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.20
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.3
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13