# ALAS2023-2023-020: Security update for 24 packages ALAS2023-2023-020, released February 17, 2023, fixes 10 CVEs across 24 products. None of them is reported as exploited. Patch Radar priority: Urgent. - Web page: https://patchblox.com/security/fix/linux/alas2023-2023-020 - Platform: Linux - Released: Feb 17, 2023 - Priority: Urgent (Closes CVE-2022-3775, rated Critical) - CVEs: 10, exploited: 0, on CISA KEV: 0 - Vendor advisory: https://alas.aws.amazon.com/AL2023/ALAS-2023-020.html ## Applies to | Product | Release | Fixed in | |---|---|---| | [grub2-common](https://patchblox.com/security/data/product/linux/grub2-common.md) | amzn 2023 | 1:2.06-61.amzn2023.0.3 | | [grub2-debuginfo](https://patchblox.com/security/data/product/linux/grub2-debuginfo.md) | amzn 2023 | 1:2.06-61.amzn2023.0.3 | | [grub2-debugsource](https://patchblox.com/security/data/product/linux/grub2-debugsource.md) | amzn 2023 | 1:2.06-61.amzn2023.0.3 | | [grub2-efi-aa64](https://patchblox.com/security/data/product/linux/grub2-efi-aa64.md) | amzn 2023 | 1:2.06-61.amzn2023.0.3 | | [grub2-efi-aa64-cdboot](https://patchblox.com/security/data/product/linux/grub2-efi-aa64-cdboot.md) | amzn 2023 | 1:2.06-61.amzn2023.0.3 | | [grub2-efi-aa64-ec2](https://patchblox.com/security/data/product/linux/grub2-efi-aa64-ec2.md) | amzn 2023 | 1:2.06-61.amzn2023.0.3 | | [grub2-efi-aa64-modules](https://patchblox.com/security/data/product/linux/grub2-efi-aa64-modules.md) | amzn 2023 | 1:2.06-61.amzn2023.0.3 | | [grub2-efi-x64](https://patchblox.com/security/data/product/linux/grub2-efi-x64.md) | amzn 2023 | 1:2.06-61.amzn2023.0.3 | | [grub2-efi-x64-cdboot](https://patchblox.com/security/data/product/linux/grub2-efi-x64-cdboot.md) | amzn 2023 | 1:2.06-61.amzn2023.0.3 | | [grub2-efi-x64-ec2](https://patchblox.com/security/data/product/linux/grub2-efi-x64-ec2.md) | amzn 2023 | 1:2.06-61.amzn2023.0.3 | | [grub2-efi-x64-modules](https://patchblox.com/security/data/product/linux/grub2-efi-x64-modules.md) | amzn 2023 | 1:2.06-61.amzn2023.0.3 | | [grub2-emu](https://patchblox.com/security/data/product/linux/grub2-emu.md) | amzn 2023 | 1:2.06-61.amzn2023.0.3 | | [grub2-emu-debuginfo](https://patchblox.com/security/data/product/linux/grub2-emu-debuginfo.md) | amzn 2023 | 1:2.06-61.amzn2023.0.3 | | [grub2-emu-modules](https://patchblox.com/security/data/product/linux/grub2-emu-modules.md) | amzn 2023 | 1:2.06-61.amzn2023.0.3 | | [grub2-pc](https://patchblox.com/security/data/product/linux/grub2-pc.md) | amzn 2023 | 1:2.06-61.amzn2023.0.3 | | [grub2-pc-modules](https://patchblox.com/security/data/product/linux/grub2-pc-modules.md) | amzn 2023 | 1:2.06-61.amzn2023.0.3 | | [grub2-tools](https://patchblox.com/security/data/product/linux/grub2-tools.md) | amzn 2023 | 1:2.06-61.amzn2023.0.3 | | [grub2-tools-debuginfo](https://patchblox.com/security/data/product/linux/grub2-tools-debuginfo.md) | amzn 2023 | 1:2.06-61.amzn2023.0.3 | | [grub2-tools-efi](https://patchblox.com/security/data/product/linux/grub2-tools-efi.md) | amzn 2023 | 1:2.06-61.amzn2023.0.3 | | [grub2-tools-efi-debuginfo](https://patchblox.com/security/data/product/linux/grub2-tools-efi-debuginfo.md) | amzn 2023 | 1:2.06-61.amzn2023.0.3 | | [grub2-tools-extra](https://patchblox.com/security/data/product/linux/grub2-tools-extra.md) | amzn 2023 | 1:2.06-61.amzn2023.0.3 | | [grub2-tools-extra-debuginfo](https://patchblox.com/security/data/product/linux/grub2-tools-extra-debuginfo.md) | amzn 2023 | 1:2.06-61.amzn2023.0.3 | | [grub2-tools-minimal](https://patchblox.com/security/data/product/linux/grub2-tools-minimal.md) | amzn 2023 | 1:2.06-61.amzn2023.0.3 | | [grub2-tools-minimal-debuginfo](https://patchblox.com/security/data/product/linux/grub2-tools-minimal-debuginfo.md) | amzn 2023 | 1:2.06-61.amzn2023.0.3 | ## CVEs this fix closes | CVE | Priority | Title | CVSS | EPSS | Exploitation | |---|---|---|---:|---:|---| | [CVE-2022-3775](https://patchblox.com/security/data/cve/CVE-2022-3775.md) | Urgent | Redhat: CVE-2022-3775 grub2 - Heap based out-of-bounds write when rendering certain Unicode sequences | 8.2 | 0.0104 | | | [CVE-2022-28733](https://patchblox.com/security/data/cve/CVE-2022-28733.md) | High | grub-efi-amd64: Integer underflow in grub_net_recv_ip4_packets; A malicious crafted IP packet can lead to an integer underflow in gru... | 8.1 | 0.0127 | | | [CVE-2022-28734](https://patchblox.com/security/data/cve/CVE-2022-28734.md) | High | grub2-common: The grub2 packages provide version 2 of the Grand Unified Boot Loader (GRUB), a highly configurable and customizable... | 8.1 | 0.0112 | | | [CVE-2022-2601](https://patchblox.com/security/data/cve/CVE-2022-2601.md) | High | Redhat: CVE-2022-2601 grub2 - Buffer overflow in grub_font_construct_glyph() can lead to out-of-bound write and possible secure boot bypass | 8.6 | 0.0052 | | | [CVE-2021-3696](https://patchblox.com/security/data/cve/CVE-2021-3696.md) | High | grub2-common: The grub2 packages provide version 2 of the Grand Unified Boot Loader (GRUB), a highly configurable and customizable... | 8.1 | 0.0048 | | | [CVE-2021-3695](https://patchblox.com/security/data/cve/CVE-2021-3695.md) | High | grub2-common: The grub2 packages provide version 2 of the Grand Unified Boot Loader (GRUB), a highly configurable and customizable... | 8.1 | 0.0048 | | | [CVE-2021-3697](https://patchblox.com/security/data/cve/CVE-2021-3697.md) | High | grub2-common: The grub2 packages provide version 2 of the Grand Unified Boot Loader (GRUB), a highly configurable and customizable... | 8.1 | 0.0047 | | | [CVE-2022-28735](https://patchblox.com/security/data/cve/CVE-2022-28735.md) | High | grub-efi-arm64: The GRUB2's shim_lock verifier allows non-kernel files to be loaded on shim-powered secure boot systems | 8.1 | 0.0032 | | | [CVE-2022-28736](https://patchblox.com/security/data/cve/CVE-2022-28736.md) | High | grub-efi-arm64: There's a use-after-free vulnerability in grub_cmd_chainloader() function; The chainloader command is used to boot up... | 8.1 | 0.0029 | | | [CVE-2021-3981](https://patchblox.com/security/data/cve/CVE-2021-3981.md) | Routine | grub2-common: The grub2 packages provide version 2 of the Grand Unified Boot Loader (GRUB), a highly configurable and customizable... | 3.3 | 0.0032 | | --- Data as of 2026-11-09T13:31:49Z UTC. 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