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CVE-2024-1048

Published: 6 February 2024

A flaw was found in the grub2-set-bootflag utility of grub2. After the fix of CVE-2019-14865, grub2-set-bootflag will create a temporary file with the new grubenv content and rename it to the original grubenv file. If the program is killed before the rename operation, the temporary file will not be removed and may fill the filesystem when invoked multiple times, resulting in a filesystem out of free inodes or blocks.

Notes

AuthorNote
eslerm
the grub2 package does not affect Ubuntu's Secure Boot
grub2-unsigned contains Secure Boot security fixes grub2 and
grub2-unsigned should have same major version Ubuntu Secure Boot
and ESM do not cover i386 trusty's GA kernel cannot handle new
versions of grub Note that key revocation is required to protect
against evil housekeeper attacks (such as BlackLotus)

Priority

Medium

Cvss 3 Severity Score

3.3

Score breakdown

Status

Package Release Status
grub2
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(does not affect Secure Boot)
focal Not vulnerable
(does not affect Secure Boot)
jammy Not vulnerable
(does not affect Secure Boot)
mantic Not vulnerable
(does not affect Secure Boot)
trusty Not vulnerable
(does not affect Secure Boot)
upstream Needs triage

xenial Not vulnerable
(does not affect Secure Boot)
grub2-signed
Launchpad, Ubuntu, Debian
bionic Needs triage

focal Needs triage

jammy Needs triage

mantic Needs triage

trusty Ignored
(update incompatible with kernel)
upstream Needs triage

xenial Needs triage

grub2-unsigned
Launchpad, Ubuntu, Debian
bionic Needs triage

focal Needs triage

jammy Needs triage

mantic Needs triage

trusty Ignored
(end of standard support)
upstream Needs triage

xenial Needs triage

Severity score breakdown

Parameter Value
Base score 3.3
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact Low
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L