#VU66808 Permissions, Privileges, and Access Controls in Linux kernel - CVE-2022-36123

Vulnerability identifier: #VU66808

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2022-36123

CWE-ID: CWE-264

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 escalate privileges on the system.

The vulnerability exists due to Linux kernel lacks a certain clear operation for the block starting symbol (.bss). A local user on the Xen PV guest OS can perform a denial of service attack or escalate privileges on the guest OS.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Linux kernel: before 5.18.3, 5.18.3

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External links
https://github.com/sickcodes/security/blob/master/advisories/SICK-2022-128.md
https://github.com/torvalds/linux/commit/74a0032b8524ee2bd4443128c0bf9775928680b0
https://sick.codes/sick-2022-128
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.18.13
https://github.com/torvalds/linux/commit/96e8fc5818686d4a1591bb6907e7fdb64ef29884

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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.