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Vulnerability record · CVE-2020-15706 · published 29 July 2020

CVE-2020-15706: Gnu grub2 race condition vulnerability

Gnu · Grub2

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.

6.4 CVSS 3.1 Medium EPSS 0.98% · top 39.3% CWE-362 · Race conditionCWE-416 · Use after free
6.4CVSS 3.1 base score, v2 4.4
0.98%EPSS exploitation probability, 30 days
NoNot in CISA KEV
14Affected product versions listed by NVD
34References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

Affected products

14 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.html Broken LinkMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.html Broken LinkMailing ListThird Party Advisory
http://ubuntu.com/security/notices/USN-4432-1 Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/07/29/3 Mailing ListThird Party Advisory
https://access.redhat.com/security/vulnerabilities/grub2bootloader Third Party Advisory
https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html Issue TrackingVendor Advisory
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011 PatchThird Party AdvisoryVendor Advisory
https://security.gentoo.org/glsa/202104-05 Third Party Advisory
https://security.netapp.com/advisory/ntap-20200731-0008/ Third Party Advisory
https://usn.ubuntu.com/4432-1/ Third Party Advisory
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass Third Party Advisory
https://www.debian.org/security/2020-GRUB-UEFI-SecureBoot Third Party Advisory
https://www.debian.org/security/2020/dsa-4735 Third Party Advisory
https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/ Third Party Advisory
https://www.openwall.com/lists/oss-security/2020/07/29/3 Mailing ListThird Party Advisory
https://www.suse.com/c/suse-addresses-grub2-secure-boot-issue/ Third Party Advisory
https://www.suse.com/support/kb/doc/?id=000019673 Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.html Broken LinkMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.html Broken LinkMailing ListThird Party Advisory
http://ubuntu.com/security/notices/USN-4432-1 Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/07/29/3 Mailing ListThird Party Advisory
https://access.redhat.com/security/vulnerabilities/grub2bootloader Third Party Advisory
https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html Issue TrackingVendor Advisory
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011 PatchThird Party AdvisoryVendor Advisory
https://security.gentoo.org/glsa/202104-05 Third Party Advisory
https://security.netapp.com/advisory/ntap-20200731-0008/ Third Party Advisory
https://usn.ubuntu.com/4432-1/ Third Party Advisory
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass Third Party Advisory
https://www.debian.org/security/2020-GRUB-UEFI-SecureBoot Third Party Advisory
https://www.debian.org/security/2020/dsa-4735 Third Party Advisory
https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/ Third Party Advisory
https://www.openwall.com/lists/oss-security/2020/07/29/3 Mailing ListThird Party Advisory
https://www.suse.com/c/suse-addresses-grub2-secure-boot-issue/ Third Party Advisory
https://www.suse.com/support/kb/doc/?id=000019673 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-15706), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.