Description
When rendering certain unicode sequences, grub2's font code doesn't proper validate if the informed glyph's width and height is constrained within bitmap size. As consequence an attacker can craft an input which will lead to a out-of-bounds write into grub2's heap, leading to memory corruption and availability issues. Although complex, arbitrary code execution could not be discarded.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | grub2 | All up to 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 | 2.06-5 | — |
| Debian 13 | grub2 | 2.06-5 | — |
| Debian 12 | grub2 | 2.06-5 | — |
| Debian 11 | grub2 | 2.06-3~deb11u4 | DSA-5280-1 |
| Debian 10 | grub2 | 2.06-3~deb10u2 | DLA-3190-2, DLA-3190-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | grub2-signed | 1.187.3~22.04.1 | USN-6355-1 |
| Ubuntu 22.04 LTS | grub2-unsigned | 2.06-2ubuntu14 | USN-6355-1 |
| Ubuntu 22.04 LTS | shim | 15.7-0ubuntu1 | USN-6355-1 |
| Ubuntu 22.04 LTS | shim-signed | 1.51.3 | USN-6355-1 |
| Ubuntu 20.04 LTS | grub2-signed | 1.187.3~20.04.1 | USN-6355-1 |
| Ubuntu 20.04 LTS | grub2-unsigned | 2.06-2ubuntu14 | USN-6355-1 |
| Ubuntu 20.04 LTS | shim | 15.7-0ubuntu1 | USN-6355-1 |
| Ubuntu 20.04 LTS | shim-signed | 1.40.9 | USN-6355-1 |
| Ubuntu 18.04 LTS | grub2-signed | 1.187.3~18.04.1 | — |
| Ubuntu 18.04 LTS | grub2-unsigned | 2.06-2ubuntu14.1 | — |
| Ubuntu 16.04 LTS | grub2-signed +1 | No fix yet | — |
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 9 | grub2 +15 | 1:2.06-46.el9_1.3 | RHSA-2023:0752 |
| RHEL 8 | grub2 +18 | 1:2.02-142.el8_7.1 | RHSA-2023:0049 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.0 EUS | grub2 +15 | 1:2.06-27.el9_0.12 | RHSA-2022:8978 |
| RHEL 8.6 EUS | grub2 +18 | 1:2.02-123.el8_6.12 | RHSA-2023:0048 |
| RHEL 8.4 EUS | grub2 +18 | 1:2.02-99.el8_4.10 | RHSA-2023:0047 |
| RHEL 8.2 TUS | grub2 +15 | 1:2.02-87.el8_2.11 | RHSA-2022:8800 |
| RHEL 8.2 E4S | grub2 +16 | 1:2.02-87.el8_2.11 | RHSA-2022:8800 |
| RHEL 8.2 AUS | grub2 +15 | 1:2.02-87.el8_2.11 | RHSA-2022:8800 |
| RHEL 8.1 E4S | grub2 +16 | 1:2.02-87.el8_1.11 | RHSA-2022:8494 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | grub2-pc +14 | 1:2.06-46.el9_1.3.alma | ALSA-2023:0752 |
| AlmaLinux 8 | grub2-pc +17 | 1:2.02-142.el8_7.1.alma | ALSA-2023:0049 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | grub2 | 1:2.06-46.el9_1.3.rocky.0.2 | RLSA-2023:0752 |
| Rocky Linux 8 | grub2 | 1:2.02-142.el8_7.1.rocky.0.2 | RLSA-2023:0049 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP4 | grub2 | 2.06-150400.11.17.1 | SUSE-SU-2022:4141-1 |
| SLES 15 SP3 | grub2 | 2.04-150300.22.25.1 | SUSE-SU-2022:4219-1 |
| SLES 15 SP2 | grub2 | 2.04-150200.9.68.1 | SUSE-SU-2022:4218-1 |
| SLES 15 SP1 | grub2 | 2.02-150100.123.17.1 | SUSE-SU-2022:4142-1 |
| SLES 15 | grub2 | 2.02-150000.122.17.1 | SUSE-SU-2022:4140-1 |
Show 24 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | grub2 | 2.02-153.1 | SUSE-SU-2022:4302-1 |
| SLES 12 SP4 | grub2 | 2.02-153.1 | SUSE-SU-2022:4302-1 |
| SLES 12 SP3 | grub2 | 2.02-142.1 | SUSE-SU-2022:4143-1 |
| SLES 12 SP2 | grub2 | 2.02-115.72.1 | SUSE-SU-2022:4144-1 |
| SLES for SAP 15 SP2 | grub2 | 2.04-150200.9.68.1 | SUSE-SU-2022:4218-1 |
| SLES for SAP 15 SP1 | grub2 | 2.02-150100.123.17.1 | SUSE-SU-2022:4142-1 |
| SLES for SAP 15 | grub2 | 2.02-150000.122.17.1 | SUSE-SU-2022:4140-1 |
| SLES for SAP 12 SP5 | grub2 | 2.02-153.1 | SUSE-SU-2022:4302-1 |
| SLES for SAP 12 SP4 | grub2 | 2.02-153.1 | SUSE-SU-2022:4302-1 |
| SLE Micro 5.3 | grub2 | 2.06-150400.11.17.1 | SUSE-SU-2022:4141-1 |
| SLE Micro 5.2 | grub2 | 2.04-150300.22.25.1 | SUSE-SU-2022:4219-1 |
| SLE Micro 5.1 | grub2 | 2.04-150300.3.8.1 | SUSE-SU-2023:1701-1 |
| SLE HPC 15 SP2 | grub2 | 2.04-150200.9.68.1 | SUSE-SU-2022:4218-1 |
| SLE HPC 15 SP1 | grub2 | 2.02-150100.123.17.1 | SUSE-SU-2022:4142-1 |
| SLE HPC 15 | grub2 | 2.02-150000.122.17.1 | SUSE-SU-2022:4140-1 |
| SUSE OpenStack Cloud Crowbar 9 | grub2 | 2.02-153.1 | SUSE-SU-2022:4302-1 |
| SUSE OpenStack Cloud 9 | grub2 | 2.02-153.1 | SUSE-SU-2022:4302-1 |
| SUSE Manager Server 4.1 | grub2 | 2.04-150200.9.68.1 | SUSE-SU-2022:4218-1 |
| SUSE Manager Retail Branch Server 4.1 | grub2 | 2.04-150200.9.68.1 | SUSE-SU-2022:4218-1 |
| SUSE Manager Proxy Module 4.3 | grub2 | 2.06-150400.11.17.1 | SUSE-SU-2022:4141-1 |
| SUSE Manager Proxy Module 4.2 | grub2 | 2.04-150300.22.25.1 | SUSE-SU-2022:4219-1 |
| SUSE Manager Proxy 4.1 | grub2 | 2.04-150200.9.68.1 | SUSE-SU-2022:4218-1 |
| SUSE Enterprise Storage 7 | grub2 | 2.04-150200.9.68.1 | SUSE-SU-2022:4218-1 |
| SUSE Enterprise Storage 6 | grub2 | 2.02-150100.123.17.1 | SUSE-SU-2022:4142-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | grub2 | 2.06-31.1 | openSUSE-SU-2024:12517-1 |
| openSUSE Leap 15.4 | grub2 | 2.06-150400.11.17.1 | SUSE-SU-2022:4141-1 |
| openSUSE Leap 15.3 | grub2 | 2.04-150300.22.25.1 | SUSE-SU-2022:4219-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap Micro 5.3 | grub2 | 2.06-150400.11.17.1 | SUSE-SU-2022:4141-1 |
| openSUSE Leap Micro 5.2 | grub2 | 2.04-150300.22.25.1 | SUSE-SU-2022:4219-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | grub2-pc +16 | 1:2.06-61.amzn2023.0.3 | ALAS2023-2023-020 |
| Amazon Linux 2 | grub2 +17 | 1:2.06-14.amzn2 | ALAS2-2023-2146 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | grub2 | 2.06-14 | — |
| Azure Linux 2 (CBL-Mariner) | grub2 | 2.06-10 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | grub2-pc +12 | 1:2.06-46.0.4.el9 | ELSA-2023-12019, ELSA-2023-0752 |
| Oracle Linux 8 | grub2-pc +15 | 1:2.02-142.0.3.el8_7.1 | ELSA-2023-0049 |
Advisories 35
- ALSA-2023:0752 Moderate: grub2 security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:0049 Moderate: grub2 security update AlmaLinux Security Advisories · Oct 29, 2026
- USN-6355-1 grub2-signed, grub2-unsigned, shim, and shim-signed vulnerability Ubuntu Security Notices (USN) · May 29, 2026
- RHSA-2023:0752 Red Hat Security Advisory: grub2 security update Red Hat Security Advisories (RHSA) · May 28, 2026
- RHSA-2023:0048 Red Hat Security Advisory: grub2 security and bug fix update Red Hat Security Advisories (RHSA) · May 28, 2026
- RHSA-2023:0049 Red Hat Security Advisory: grub2 security update Red Hat Security Advisories (RHSA) · May 28, 2026
- RHSA-2023:0047 Red Hat Security Advisory: grub2 security update Red Hat Security Advisories (RHSA) · May 28, 2026
- RHSA-2022:8978 Red Hat Security Advisory: grub2 security and bug fix update Red Hat Security Advisories (RHSA) · May 28, 2026
- RHSA-2022:8494 Red Hat Security Advisory: grub2 security update Red Hat Security Advisories (RHSA) · May 28, 2026
- RHSA-2022:8800 Red Hat Security Advisory: grub2 security update Red Hat Security Advisories (RHSA) · May 28, 2026
- WID-SEC-2022-2058 Grub2: Mehrere Schwachstellen BSI CERT-Bund (WID) · Apr 7, 2026
- DSA-5280-1 grub2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3190-1 grub2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3190-2 grub2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2023:0049 Moderate: grub2 security update Rocky Linux Security Advisories · Feb 5, 2026
- RLSA-2023:0752 Moderate: grub2 security update Rocky Linux Security Advisories · Feb 4, 2026
- openSUSE-SU-2024:12517-1 grub2-2.06-31.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:4140-1 Security update for grub2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:4143-1 Security update for grub2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:4302-1 Security update for grub2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:4218-1 Security update for grub2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:1701-1 Security update for grub2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:4142-1 Security update for grub2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:4144-1 Security update for grub2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:4141-1 Security update for grub2 SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2025-0225 Dell PowerProtect Data Domain: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 1, 2025
- SUSE-SU-2022:4219-1 Security update for grub2 SUSE / openSUSE Security Updates · May 2, 2025
- NCSC-2024-0334 Kwetsbaarheden verholpen in Microsoft Windows NCSC-NL (Netherlands) · Aug 27, 2024
- WID-SEC-2024-1835 Microsoft Windows: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 26, 2024
- NCSC-2024-0339 Kwetsbaarheden verholpen in Microsoft Mariner NCSC-NL (Netherlands) · Aug 13, 2024
- ALAS2-2023-2146 Important: grub2 security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jul 19, 2023
- ELSA-2023-0752 Moderate: grub2 security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jun 13, 2023
- ALAS2023-2023-020 Important: grub2 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Feb 22, 2023
- ELSA-2023-0049 Moderate: grub2 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jan 25, 2023
- ELSA-2023-12019 Important: grub2 security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jan 12, 2023
References
- https://access.redhat.com/security/cve/cve-2022-3775
- GLSA-202311-14 vendor-advisory