CVE-2020-25632
Published: 02 March 2021
A flaw was found in grub2 in versions prior to 2.06. The rmmod implementation allows the unloading of a module used as a dependency without checking if any other dependent module is still loaded leading to a use-after-free scenario. This could allow arbitrary code to be executed or a bypass of Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
From the Ubuntu security team
Chris Coulson discovered that the rmmod command in GRUB 2 contained a use-after-free vulnerability. A local attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions.
Priority
Medium
CVSS 3 base score: 7.5
Status
| Package | Release | Status |
|---|---|---|
|
grub2-signed Launchpad, Ubuntu, Debian |
Upstream |
Needs triage
|
| Ubuntu 21.04 (Hirsute Hippo) |
Released
(1.164)
|
|
| Ubuntu 20.04 LTS (Focal Fossa) |
Released
(1.167.2)
|
|
| Ubuntu 18.04 LTS (Bionic Beaver) |
Released
(1.167~18.04.5)
|
|
| Ubuntu 16.04 ESM (Xenial Xerus) |
Pending
(1.164)
|
|
| Ubuntu 14.04 ESM (Trusty Tahr) |
Needs triage
|
|
|
grub2-unsigned Launchpad, Ubuntu, Debian |
Upstream |
Needs triage
|
| Ubuntu 21.04 (Hirsute Hippo) |
Released
(2.04-1ubuntu42)
|
|
| Ubuntu 20.04 LTS (Focal Fossa) |
Released
(2.04-1ubuntu44.2)
|
|
| Ubuntu 18.04 LTS (Bionic Beaver) |
Released
(2.04-1ubuntu44.1.2)
|
|
| Ubuntu 16.04 ESM (Xenial Xerus) |
Pending
(2.04-1ubuntu42)
|
|
| Ubuntu 14.04 ESM (Trusty Tahr) |
Needs triage
|