Denial of service in Linux kernel SVM

1) Expected behavior violation

EUVDB-ID: #VU71582

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-3344

CWE-ID: CWE-440 - Expected Behavior Violation

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to an error in the KVM's AMD nested virtualization (SVM). A malicious L1 guest can purposely fail to intercept the shutdown of a cooperative nested guest (L2), possibly leading to a page fault and kernel panic in the host (L0).

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Linux kernel: before 6.1 rc7

External links

http://lore.kernel.org/lkml/20221020093055.224317-5-mlevitsk@redhat.com/T/
http://bugzilla.redhat.com/show_bug.cgi?id=2130278

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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