NULL pointer dereference in Linux kernel kvm svm

1) NULL pointer dereference

EUVDB-ID: #VU90843

Risk: Low

CVSSv3.1: 4.8 [AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-47062

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 sev_launch_update_vmsa() function in arch/x86/kvm/svm/sev.c. A local user can perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: All versions

CPE2.3

External links

http://git.kernel.org/stable/c/bd0cced2ae93195668f983d443f7f17e8efd24d2
http://git.kernel.org/stable/c/ba7bf5d6336aa9c0d977b161bfa420c56d46ee40
http://git.kernel.org/stable/c/c36b16d29f3af5f32fc1b2a3401bf48f71cabee1

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.