Out-of-bounds read in Linux kernel - CVE-2021-46993
Published: June 4, 2024 / Updated: May 13, 2025
Vulnerability identifier: #VU91104
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-2021-46993
CWE-ID: CWE-125
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 an out-of-bounds read error within the DEFINE_STATIC_KEY_FALSE() function in kernel/sched/core.c. A local user can perform a denial of service (DoS) attack.
Affected software
Linux kernel
How to mitigate CVE-2021-46993
Install update from vendor's website.
Linux kernel - addressed in versions 5.4.120, 5.10.38, 5.11.22, 5.12.5, 5.13
External References
- https://git.kernel.org/stable/c/687f523c134b7f0bd040ee1230f6d17990d54172
- https://git.kernel.org/stable/c/f7347c85490b92dd144fa1fba9e1eca501656ab3
- https://git.kernel.org/stable/c/3da3f804b82a0a382d523a21acf4cf3bb35f936d
- https://git.kernel.org/stable/c/42ee47c7e3569d9a0e2cb5053c496d97d380472f
- https://git.kernel.org/stable/c/6d2f8909a5fabb73fe2a63918117943986c39b6c
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.38
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.22
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.5
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.120