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grub2: Buffer overflow in grub_font_construct_glyph() can lead to out-of-bound write and possible secure boot bypass

🗓️ 09 Jan 2023 14:51:08Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 3 Views

Grub2 buffer overflow in grub_font_construct_glyph from a crafted pf two font may cause memory corruption and secure boot bypass.

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Tenable Nessus		Amazon Linux 2 : grub2 (ALAS-2023-2146)
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Tenable Nessus		Alibaba Cloud Linux 3 : 0003: grub2 (ALINUX3-SA-2023:0003)
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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux8.4anygrub2-common1:2.02-99.el8_4.10.noarchgrub2-common-1:2.02-99.el8_4.10.noarch.noarch.rpm
Red Hat Enterprise Linux8.4aarch64grub2-debuginfo1:2.02-99.el8_4.10grub2-debuginfo-1:2.02-99.el8_4.10.aarch64.rpm
Red Hat Enterprise Linux8.4ppc64legrub2-debuginfo1:2.02-99.el8_4.10grub2-debuginfo-1:2.02-99.el8_4.10.ppc64le.rpm
Red Hat Enterprise Linux8.4x86_64grub2-debuginfo1:2.02-99.el8_4.10grub2-debuginfo-1:2.02-99.el8_4.10.x86_64.rpm
Red Hat Enterprise Linux8.4aarch64grub2-debugsource1:2.02-99.el8_4.10grub2-debugsource-1:2.02-99.el8_4.10.aarch64.rpm
Red Hat Enterprise Linux8.4ppc64legrub2-debugsource1:2.02-99.el8_4.10grub2-debugsource-1:2.02-99.el8_4.10.ppc64le.rpm
Red Hat Enterprise Linux8.4x86_64grub2-debugsource1:2.02-99.el8_4.10grub2-debugsource-1:2.02-99.el8_4.10.x86_64.rpm
Red Hat Enterprise Linux8.4aarch64grub2-efi-aa641:2.02-99.el8_4.10grub2-efi-aa64-1:2.02-99.el8_4.10.aarch64.rpm
Red Hat Enterprise Linux8.4aarch64grub2-efi-aa64-cdboot1:2.02-99.el8_4.10grub2-efi-aa64-cdboot-1:2.02-99.el8_4.10.aarch64.rpm
Red Hat Enterprise Linux8.4anygrub2-efi-aa64-modules1:2.02-99.el8_4.10.noarchgrub2-efi-aa64-modules-1:2.02-99.el8_4.10.noarch.noarch.rpm
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27 May 2026 16:27Current
5.7Medium risk
Vulners AI Score5.7
CVSS 3.18.6
EPSS0.00514
SSVC
CWE-787
grub twobuffer overflowglyph constructionmemory corruptionsecure boot bypasspf two font
3