Resource management error in Linux kernel - CVE-2021-46978
Published: June 25, 2024 / Updated: May 13, 2025
Vulnerability identifier: #VU93274
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-2021-46978
CWE-ID: CWE-399
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 resource management error within the nested_get_evmcs_page(), nested_get_vmcs12_pages() and nested_vmx_vmexit() functions in arch/x86/kvm/vmx/nested.c. A local user can perform a denial of service (DoS) attack.
Affected software
Linux kernel
How to mitigate CVE-2021-46978
Install update from vendor's website.
Linux kernel - addressed in versions 5.10.38, 5.11.22, 5.12.5, 5.13
External References
- https://git.kernel.org/stable/c/c8bf64e3fb77cc19bad146fbe26651985b117194
- https://git.kernel.org/stable/c/200a45649ab7361bc80c70aebf7165b64f9a6c9f
- https://git.kernel.org/stable/c/bd0e8455b85b651a4c77de9616e307129b15aaa7
- https://git.kernel.org/stable/c/f5c7e8425f18fdb9bdb7d13340651d7876890329
- 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