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

suse_linux SUSE-SU-2025:02813-1: SUSE SLED15 / SLES15 : Recommended update for grub2 (Moderate) (SUSE-SU-2025:02813-1)

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2025:02772-1 advisory.

    - 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)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES12 host has packages installed that are affected by a vulnerability as referenced in the SUSE- SU-2025:02725-1 advisory.

    - CVE-2024-56738: Fixed side-channel attack due to not constant-time algorithm in grub_crypto_memcmp     (bsc#1234959)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
249222	SUSE SLED15 / SLES15 / openSUSE 15 : Recommended update for grub2 (SUSE-SU-2025:02772-1)	Nessus	SuSE Local Security Checks	medium
245588	SUSE SLES12 Security Update : grub2 (SUSE-SU-2025:02725-1)	Nessus	SuSE Local Security Checks	medium
231890	Linux Distros Unpatched Vulnerability : CVE-2024-56738	Nessus	Misc.	medium

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