Home/CVE/GRUB2 contains a race condition in grub_script_function_create() leading to a use-after-free vulnerability which can be
CVE

CVE-2020-15706

GRUB2 contains a race condition in grub_script_function_create() leading to a use-after-free vulnerability which can be

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.

MEDIUM · CVSS 6.4 EPSS 0.00051
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-416Use After Free
▤

Affected Products & Versions

14
gnu grub2<= 2.04
redhat enterprise linux atomic hostall versions
redhat openshift container platformall versions
canonical ubuntu linuxall versions
debian linuxall versions
redhat enterprise linuxall versions
suse linux enterprise serverall versions
microsoft windows 10all versions
▣

Scoring & Timeline

6.4
MEDIUM · CVSS v3.1 · security@ubuntu.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD29 Jul 2020 · 06:15 PM
CVSS VectorCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
⚑

Vendor Advisories

22
suse-csafopenSUSE-SU-2024:10824-1
msrcCVE-2020-15706
suse-csafopenSUSE-SU-2020:1168-1
suse-csafopenSUSE-SU-2020:1169-1
usnUSN-4432-1
🔗

References & Sources

17
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.htmlBroken LinkMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.htmlBroken LinkMailing ListThird Party Advisory
http://ubuntu.com/security/notices/USN-4432-1Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/07/29/3Mailing ListThird Party Advisory
https://access.redhat.com/security/vulnerabilities/grub2bootloaderThird Party Advisory
https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.htmlIssue TrackingVendor Advisory
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