CVSS 3.1
6.4 mediumCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:HCVE-2020-15706
Medium (6.4). EPSS 1.0% chance of exploitation in the next 30 days.
GRUB2 contains a race condition in grub_script_function_create() leading to a use-after-free vulnerability which can be triggered by redefining a function whilst the same function is already executing, leading to arbitrary code execution and secure boot restriction bypass. This issue affects GRUB2 version 2.04 and prior versions.
Severity
- EPSS
- 1.0% chance of exploitation in the next 30 days; higher than 62% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-362, CWE-416
- Published
- Modified
- Record from
- the NVD, synced
Affected
- canonical:ubuntu_linux
- debian:debian_linux
- gnu:grub2
- microsoft:windows_10
- microsoft:windows_8.1
- microsoft:windows_rt_8.1
- microsoft:windows_server_2012
- microsoft:windows_server_2016
- microsoft:windows_server_2019
- opensuse:leap
- redhat:enterprise_linux
- redhat:enterprise_linux_atomic_host
- redhat:openshift_container_platform
- suse:suse_linux_enterprise_server
References
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.html
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.html
- http://ubuntu.com/security/notices/USN-4432-1
- http://www.openwall.com/lists/oss-security/2020/07/29/3
- https://access.redhat.com/security/vulnerabilities/grub2bootloader