# CVE-2024-56738: GNU GRUB (aka GRUB2) through 2.12 does not use a constant-time algorithm for grub_crypto_memcmp and thus allows side-channel attacks.

CVE-2024-56738 is fixed in grub2 on 1 platform, first by SUSE-SU-2025:02772-1, released August 12, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-56738
- Priority: Routine
- CVSS: 6.7 (Moderate)
- EPSS: 0.0041
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 12, 2025
- Weakness: Observable Timing Discrepancy
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-56738

## Description

This update for grub2 fixes the following issues:  - CVE-2024-56738: Fixed side-channel attack due to not    constant-time algorithm in grub_crypto_memcmp (bsc#1234959)  Other fixes: - Fix test -f and -s do not work properly over the network files    served via tftp and http (bsc#1246157, bsc#1246237) - Skip mount point in grub_find_device function (bsc#1246231)

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | grub2 opensuse-leap 15.6 | 2.12-150600.8.34.1 | [SUSE-SU-2025:02772-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-02772-1.md) | Aug 12, 2025 |
| Linux | grub2 opensuse-leap 16.0 | 2.12-160000.3.1 | [OPENSUSE-SU-2025:20163-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20163-1.md) | Dec 15, 2025 |
| Linux | grub2 sles 15.6 | 2.12-150600.8.34.1 | [SUSE-SU-2025:02772-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-02772-1.md) | Aug 12, 2025 |
| Linux | grub2 sles 15.7 | 2.12-150700.19.13.2 | [SUSE-SU-2025:02813-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-02813-1.md) | Aug 15, 2025 |
| Linux | grub2 sles 16.0 | 2.12-160000.3.1 | [SUSE-SU-2025:21212-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21212-1.md) | Dec 15, 2025 |

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Data as of 2026-11-10T01:44:33Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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