CVE-2023-4949

Publication date 10 November 2023

Last updated 26 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

An attacker with local access to a system (either through a disk or external drive) can present a modified XFS partition to grub-legacy in such a way to exploit a memory corruption in grub’s XFS file system implementation.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
grub	24.04 LTS noble	Not in release
	23.10 mantic	Not in release
	23.04 lunar	Not in release
	22.04 LTS jammy	Not in release
	20.04 LTS focal	Not in release
	18.04 LTS bionic	Ignored end of standard support
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

Notes

eslerm

does not impact secure boot

Severity score breakdown

CVSS version: CVSS v3.0

Base score 6.7 · Medium

Base metrics

Parameter	Value
Attack vector	Local
Attack complexity	Low
Privileges required	High
User interaction	None
Scope	Unchanged
Confidentiality impact	High
Integrity impact	High
Availability impact	High

Scores

Parameter	Value
Base score	6.7 · Medium
Exploitability score	-
Impact score	-

Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H