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SUSE: Grub2 Moderate Side-Channel Attack CVE-2024-56738 2025:02706-1

suse
Calendar Grey August 5, 2025
Dist Suse Esm H88
This notice outlines a significant security patch for GRUB2, aimed at mitigating a potential side-channel vulnerability found in various Linux distributions.
* bsc#1234959 Cross-References: * CVE-2024-56738

Summary

## 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) ## Patch Instructions: To install this SUSE update use the SUSE recommended installation methods like YaST online_update or "zypper patch". Alternatively you can run the command listed for your product: * openSUSE Leap 15.5 zypper in -t patch SUSE-2025-2706=1 * SUSE Linux Enterprise Micro 5.5 zypper in -t patch SUSE-SLE-Micro-5.5-2025-2706=1 ## Package List: * openSUSE Leap 15.5 (aarch64 ppc64le s390x x86_64 i586) * grub2-branding-upstream-2.06-150500.29.53.1 * grub2-2.06-150500.29.53.1 * grub2-debuginfo-2.06-150500.29.53.1 * openSUSE Leap 15.5 (aarch64 s390x x86_64 i586) * grub2-debugsource-2.06-150500.29.53.1

Topics%20covered

Topics Covered

security advisory moderate SuSE attack side-channel grub2

References

* bsc#1234959

Cross-

* CVE-2024-56738

CVSS scores:

* CVE-2024-56738 ( SUSE ): 5.7

CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

* CVE-2024-56738 ( SUSE ): 4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

* CVE-2024-56738 ( NVD ): 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected Products:

* openSUSE Leap 15.5

* SUSE Linux Enterprise Micro 5.5

An update that solves one vulnerability can now be installed.

##

* https://www.suse.com/security/cve/CVE-2024-56738.html

* https://bugzilla.suse.com/show_bug.cgi?id=1234959

Announcement ID: SUSE-SU-2025:02706-1
Release Date: 2025-08-05T10:08:33Z
Rating: moderate

Topics%20covered

Topics Covered

security advisory moderate SuSE attack side-channel grub2

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