Description
A flaw was found in grub2 in versions prior to 2.06. The option parser allows an attacker to write past the end of a heap-allocated buffer by calling certain commands with a large number of specific short forms of options. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | grub2 | grub 2.06 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | grub2 | 2.04-16 | — |
| Debian 13 | grub2 | 2.04-16 | — |
| Debian 12 | grub2 | 2.04-16 | — |
| Debian 10 | grub2 | 2.02+dfsg1-20+deb10u4 | DSA-4867-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | grub2-signed | 1.167.2 | USN-4992-1 |
| Ubuntu 20.04 LTS | grub2-unsigned | 2.04-1ubuntu44.2 | USN-4992-1 |
| Ubuntu 18.04 LTS | grub2-signed | 1.167~18.04.5 | USN-4992-1 |
| Ubuntu 18.04 LTS | grub2-unsigned | 2.04-1ubuntu44.1.2 | USN-4992-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | grub2-signed | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | fwupd | 1.5.9-1.el8_4 | RHSA-2021:2566 |
| RHEL 8 | grub2 +18 | 1:2.02-90.el8_3.1 | RHSA-2021:0696 |
| RHEL 8 | shim +3 | 15.4-2.el8_1 | RHSA-2021:1734 |
| RHEL 8 | shim-unsigned-aarch64 | 15-7.el8_1 | RHSA-2021:1734 |
| RHEL 8 | shim-unsigned-x64 | 15.4-4.el8_1 | RHSA-2021:1734 |
| RHEL 7 | grub2 +18 | 1:2.02-0.87.el7_9.2 | RHSA-2021:0699 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8.2 EUS | fwupd | 1.1.4-9.el8_2 | RHSA-2021:2790 |
| RHEL 8.2 EUS | grub2 +18 | 1:2.02-87.el8_2.3 | RHSA-2021:0697 |
| RHEL 8.2 EUS | shim +3 | 15.4-2.el8_1 | RHSA-2021:2790 |
| RHEL 8.2 EUS | shim-unsigned-aarch64 | 15-7.el8_1 | RHSA-2021:2790 |
| RHEL 8.2 EUS | shim-unsigned-x64 | 15.4-4.el8_1 | RHSA-2021:2790 |
| RHEL 8.1 EUS | fwupd | 1.1.4-4.el8_1 | RHSA-2021:3675 |
| RHEL 8.1 EUS | grub2 +18 | 1:2.02-87.el8_1.2 | RHSA-2021:0698 |
| RHEL 8.1 EUS | shim +3 | 15.4-2.el8_1 | RHSA-2021:3675 |
| RHEL 8.1 EUS | shim-unsigned-aarch64 | 15-7.el8_1 | RHSA-2021:3675 |
| RHEL 8.1 EUS | shim-unsigned-x64 | 15.4-4.el8_1 | RHSA-2021:3675 |
| RHEL 7.7 EUS | grub2 +18 | 1:2.02-0.86.el7_7.3 | RHSA-2021:0700 |
| RHEL 7.6 EUS | grub2 +18 | 1:2.02-0.86.el7_6.3 | RHSA-2021:0701 |
| RHEL 7.4 TUS | grub2 +16 | 1:2.02-0.86.el7_4.2 | RHSA-2021:0702 |
| RHEL 7.4 E4S | grub2 +17 | 1:2.02-0.86.el7_4.2 | RHSA-2021:0702 |
| RHEL 7.4 AUS | grub2 +16 | 1:2.02-0.86.el7_4.2 | RHSA-2021:0702 |
| RHEL 7.3 AUS | grub2 +16 | 1:2.02-0.86.el7_3.2 | RHSA-2021:0703 |
| RHEL 7.2 AUS | grub2 +16 | 1:2.02-0.86.el7_2.2 | RHSA-2021:0704 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | shim-unsigned-aarch64 | 15-7.el8_1.alma | ALSA-2021:1734 |
| AlmaLinux 8 | shim-unsigned-x64 | 15.4-4.el8_1.alma | ALSA-2021:1734 |
| AlmaLinux 8 | shim-x64 +2 | 15.4-2.el8_1.alma | ALSA-2021:1734 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | fwupd | 1.5.9-1.el8_4 | RLSA-2021:2566 |
| Rocky Linux 8 | shim-unsigned-aarch64 | 15-7.el8.1.1 | RLSA-2021:1734 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | grub2 | 2.04-9.34.1 | SUSE-SU-2021:0683-1 |
| SLES 15 SP1 | grub2 | 2.02-26.43.1 | SUSE-SU-2021:0684-1 |
| SLES 15 | grub2 | 2.02-19.66.1 | SUSE-SU-2021:0685-1 |
| SLES 12 SP5 | grub2 | 2.02-12.47.1 | SUSE-SU-2021:0681-1 |
| SLES 12 SP4 | grub2 | 2.02-12.47.1 | SUSE-SU-2021:0681-1 |
Show 21 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | grub2 | 2.02-4.69.1 | SUSE-SU-2021:0682-1 |
| SLES 12 SP2 | grub2 | 2.02-115.59.1 | SUSE-SU-2021:0679-1 |
| SLES 11 SP4 | grub2 | 2.02-0.66.26.1 | SUSE-SU-2021:14659-1 |
| SLES for SAP 15 SP1 | grub2 | 2.02-26.43.1 | SUSE-SU-2021:0684-1 |
| SLES for SAP 15 | grub2 | 2.02-19.66.1 | SUSE-SU-2021:0685-1 |
| SLES for SAP 12 SP5 | grub2 | 2.02-12.47.1 | SUSE-SU-2021:0681-1 |
| SLES for SAP 12 SP4 | grub2 | 2.02-12.47.1 | SUSE-SU-2021:0681-1 |
| SLES for SAP 12 SP3 | grub2 | 2.02-4.69.1 | SUSE-SU-2021:0682-1 |
| SLES for SAP 12 SP2 | grub2 | 2.02-115.59.1 | SUSE-SU-2021:0679-1 |
| SLE HPC 15 SP1 | grub2 | 2.02-26.43.1 | SUSE-SU-2021:0684-1 |
| SLE HPC 15 | grub2 | 2.02-19.66.1 | SUSE-SU-2021:0685-1 |
| SUSE OpenStack Cloud Crowbar 9 | grub2 | 2.02-12.47.1 | SUSE-SU-2021:0681-1 |
| SUSE OpenStack Cloud Crowbar 8 | grub2 | 2.02-4.69.1 | SUSE-SU-2021:0682-1 |
| SUSE OpenStack Cloud 9 | grub2 | 2.02-12.47.1 | SUSE-SU-2021:0681-1 |
| SUSE OpenStack Cloud 8 | grub2 | 2.02-4.69.1 | SUSE-SU-2021:0682-1 |
| SUSE OpenStack Cloud 7 | grub2 | 2.02-115.59.1 | SUSE-SU-2021:0679-1 |
| SUSE Manager Server 4.0 | grub2 | 2.02-26.43.1 | SUSE-SU-2021:0684-1 |
| SUSE Manager Retail Branch Server 4.0 | grub2 | 2.02-26.43.1 | SUSE-SU-2021:0684-1 |
| SUSE Manager Proxy 4.0 | grub2 | 2.02-26.43.1 | SUSE-SU-2021:0684-1 |
| SUSE HPE Helion OpenStack 8 | grub2 | 2.02-4.69.1 | SUSE-SU-2021:0682-1 |
| SUSE Enterprise Storage 6 | grub2 | 2.02-26.43.1 | SUSE-SU-2021:0684-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | grub2 | 2.06-7.1 | openSUSE-SU-2024:10824-1 |
| openSUSE Leap 15.2 | grub2 | 2.04-lp152.7.22.7 | openSUSE-SU-2021:0462-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | grub | 2.06-r0 | — |
| Alpine v3.23 | grub | 2.06-r0 | — |
| Alpine v3.22 | grub | 2.06-r0 | — |
| Alpine v3.21 | grub | 2.06-r0 | — |
| Alpine v3.20 | grub | 2.06-r0 | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | grub | 2.06-r0 | — |
| Alpine v3.18 | grub | 2.06-r0 | — |
| Alpine v3.17 | grub | 2.06-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | grub2 +17 | 1:2.06-2.amzn2.0.1 | ALAS2-2021-1684 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | grub2 | 2.06-26 | — |
| Azure Linux 2 (CBL-Mariner) | grub2 | 2.06~rc1-7 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | grub2-pc +15 | 1:2.02-90.0.2.el8 | ELSA-2021-9077, ELSA-2021-0696 |
| Oracle Linux 7 | grub2 +14 | 1:2.02-0.87.0.7.el7 | ELSA-2021-9076, ELSA-2021-0699 |
Advisories 33
- ALSA-2021:1734 Moderate: shim security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2021:3675 Red Hat Security Advisory: shim and fwupd security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2021:2790 Red Hat Security Advisory: shim and fwupd security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2021:2566 Red Hat Security Advisory: fwupd security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2021:1734 Red Hat Security Advisory: shim security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2021:0704 Red Hat Security Advisory: grub2 security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2021:0702 Red Hat Security Advisory: grub2 security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2021:0703 Red Hat Security Advisory: grub2 security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2021:0701 Red Hat Security Advisory: grub2 security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2021:0699 Red Hat Security Advisory: grub2 security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2021:0700 Red Hat Security Advisory: grub2 security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2021:0698 Red Hat Security Advisory: grub2 security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2021:0696 Red Hat Security Advisory: grub2 security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2021:0697 Red Hat Security Advisory: grub2 security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- USN-4992-1 grub2-signed, grub2-unsigned vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-4867-1 grub2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2021:1734 Moderate: shim security update Rocky Linux Security Advisories · Feb 5, 2026
- RLSA-2021:2566 Moderate: fwupd security update Rocky Linux Security Advisories · Feb 4, 2026
- SUSE-SU-2021:0681-1 Security update for grub2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:14659-1 Security update for grub2 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:0462-1 Security update for grub2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:0682-1 Security update for grub2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:0679-1 Security update for grub2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:0683-1 Security update for grub2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:0684-1 Security update for grub2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:0685-1 Security update for grub2 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10824-1 grub2-2.06-7.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- ALAS2-2021-1684 Moderate: grub2 security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Feb 29, 2024
- ICSA-21-336-06 Hitachi Energy APM Edge CISA ICS & IT advisories · Dec 2, 2021
- ELSA-2021-0699 Moderate: grub2 security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Mar 5, 2021
- ELSA-2021-0696 Moderate: grub2 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Mar 5, 2021
- ELSA-2021-9076 Important: grub2 security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Mar 2, 2021
- ELSA-2021-9077 Important: grub2 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Mar 2, 2021