Vulnerability identifier: #VU68110

Vulnerability risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-39189

CWE-ID: CWE-264

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor:

Description

The vulnerability allows a guest user to escalate privileges on the system.

The vulnerability exists due to incorrect handling of TLB flush operations in certain KVM_VCPU_PREEMPTED situations in the x86 KVM subsystem in the Linux kernel. An attacker with unprivileged access to the guest OS can escalate privileges on the guest.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

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External links
http://bugs.chromium.org/p/project-zero/issues/detail?id=2309
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6cd88243c7e03845a450795e134b488fc2afb736
http://github.com/torvalds/linux/commit/6cd88243c7e03845a450795e134b488fc2afb736
http://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.18.17

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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.