Privilege escalation in Linux kernel

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU66808

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 - Permissions, Privileges, and Access Controls

Exploit availability: No

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

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:*:*:*:*:*:*:*:*

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

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.