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A flaw was found in grub2 in versions prior to 2.06. Variable names present are expanded in the supplied command line into their corresponding variable contents using a 1kB stack buffer for temporary storage without sufficient bounds checking. If the function is called with a command line that references a variable with a sufficiently large payload it is possible to overflow the stack buffer corrupt the stack frame and control execution which could also circumvent Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
| Reporter | Title | Published | Views | Family All 202 |
|---|---|---|---|---|
 | Amazon Linux 2 : grub2 (ALAS-2021-1684) | 16 Jul 202100:00 | – | nessus |
| Alibaba Cloud Linux 3 : 0026: grub2 (ALINUX3-SA-2021:0026) | 14 May 202500:00 | – | nessus |
| Alibaba Cloud Linux 3 : 0048: fwupd (ALINUX3-SA-2021:0048) | 14 May 202500:00 | – | nessus |
| AlmaLinux 8 : grub2 (ALSA-2021:0696) | 9 Feb 202200:00 | – | nessus |
| AlmaLinux 8 : shim (ALSA-2021:1734) | 9 Feb 202200:00 | – | nessus |
| AlmaLinux 8 : fwupd (ALSA-2021:2566) | 9 Feb 202200:00 | – | nessus |
| CentOS 8 : grub2 (CESA-2021:0696) | 3 Mar 202100:00 | – | nessus |
| CentOS 8 : fwupd (CESA-2021:2566) | 3 Jul 202100:00 | – | nessus |
| CentOS 9 : shim-unsigned-x64-15.6-1.el9 | 29 Feb 202400:00 | – | nessus |
| CentOS 7 : grub2 (RHSA-2021:0699) | 9 Oct 202400:00 | – | nessus |
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16 Dec 2021 08:00Current
8.2High risk
Vulners AI Score8.2
CVSS 3.16.7
CVSS 27.2
EPSS0.00573