Vulnerability identifier: #VU63961

Vulnerability risk: Low

CVSSv3.1: 5.2 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-21499

CWE-ID: CWE-284

Exploitation vector: Local

Exploit availability: No

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

Vendor: Linux Foundation

Description

The vulnerability allows a local user to bypass implemented security restrictions.

The vulnerability exists due to improper access restrictions to the kernel debugger when booted in secure boot environments. A local privileged user can bypass UEFI Secure Boot restrictions.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Linux kernel:

---

External links
http://www.openwall.com/lists/oss-security/2022/05/24/7
http://www.openwall.com/lists/oss-security/2022/05/24/10
http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=eadb2f47a3ced5c64b23b90fd2a3463f63726066

---

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.