#VU93054 NULL pointer dereference in Linux kernel - CVE-2021-47407
Published: June 21, 2024 / Updated: May 13, 2025
Vulnerability identifier: #VU93054
Vulnerability risk: Low
CVSSv4.0: 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-2021-47407
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
Linux kernel
Linux kernel
Software vendor:
Linux Foundation
Linux Foundation
Description
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to NULL pointer dereference within the kvm_arch_free_vm() and kvm_arch_init_vm() functions in arch/x86/kvm/x86.c, within the kvm_page_track_cleanup() function in arch/x86/kvm/mmu/page_track.c. A local user can perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.
External links
- https://git.kernel.org/stable/c/deb2949417677649e2413266d7ce8c2ff73952b4
- https://git.kernel.org/stable/c/4664318f73e496cd22c71b10888e75434a123e23
- https://git.kernel.org/stable/c/eb7511bf9182292ef1df1082d23039e856d1ddfb
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.71
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.10
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15