CVE-2020-25632: 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.
Overview
- Severity
- High (CVSS 8.2)
- CVSS Vector
- CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
- Exploit Status
- Not Exploited
- Patch Tuesday
- 2021-Mar
- Released
- 2021-03-11
- Last Updated
- 2021-12-16
- EPSS Score
- 0.02% (percentile: 6.1%)
FAQ
Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.
Detection & Weaponization (1 sources)
Maturity: Exploit
- GitHub PoC: 1 repositories
Affected Products (2)
Other
Revision History
- 2021-03-11: Information published.
- 2021-12-16: Added grub2 to CBL-Mariner 2.0