NULL pointer dereference in Linux kernel include asm



| Updated: 2025-05-13
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-47407
CWE-ID CWE-476
Exploitation vector Local
Public exploit N/A
Vulnerable software
 Linux kernel
Operating systems & Components / Operating system

Vendor Linux Foundation

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) NULL pointer dereference

EUVDB-ID: #VU93054

Risk: Low

CVSSv4.0: 4.3 [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 - NULL Pointer Dereference

Exploit availability: No

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.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 5.10 - 5.15 rc7

CPE2.3 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


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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