CVE-2022-28736

Publication date 20 July 2023

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

There's a use-after-free vulnerability in grub_cmd_chainloader() function; The chainloader command is used to boot up operating systems that doesn't support multiboot and do not have direct support from GRUB2. When executing chainloader more than once a use-after-free vulnerability is triggered. If an attacker can control the GRUB2's memory allocation pattern sensitive data may be exposed and arbitrary code execution can be achieved.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
grub2	24.04 LTS noble	Not affected
	23.10 mantic	Not affected
	23.04 lunar	Not affected
	22.10 kinetic	Not affected
	22.04 LTS jammy	Not affected
	21.10 impish	Ignored
	20.04 LTS focal	Not affected
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected
grub2-signed	24.04 LTS noble	Not affected
	23.10 mantic	Not affected
	23.04 lunar	Not affected
	22.10 kinetic	Ignored
	22.04 LTS jammy	Fixed 1.187.3~22.04.1
	20.04 LTS focal	Fixed 1.187.3~20.04.1
	18.04 LTS bionic	Fixed 1.187.3~18.04.1
	16.04 LTS xenial	Vulnerable
	14.04 LTS trusty	Needs evaluation
grub2-unsigned	24.04 LTS noble	Not affected
	23.10 mantic	Not affected
	23.04 lunar	Not affected
	22.10 kinetic	Ignored
	22.04 LTS jammy	Fixed 2.06-2ubuntu14.1
	20.04 LTS focal	Fixed 2.06-2ubuntu14.1
	18.04 LTS bionic	Fixed 2.06-2ubuntu14.1
	16.04 LTS xenial	Vulnerable
	14.04 LTS trusty	Not in release

Severity score breakdown

Parameter	Value
Base score	6.4 · Medium
Attack vector	Local
Attack complexity	High
Privileges required	High
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)