Medium severity · published Dec 29, 2024
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
5.3
CVSS
0.4%
EPSS
No
On KEV
Description
GNU GRUB (aka GRUB2) through 2.12 does not use a constant-time algorithm for grub_crypto_memcmp and thus allows side-channel attacks.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 35% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GR
GRUB2 · GNU
2.00 through 2.12 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2024-56738
CVE.org
https://www.cve.org/CVERecord?id=CVE-2024-56738
Issue Tracking
https://savannah.gnu.org/bugs/?66603
More from GRUB2
8.8
CVE-2024-56737
GNU GRUB (aka GRUB2) through 2.12 has a heap-based buffer overflow in fs/hfs.c via crafted sblock data in an HFS filesystem
8.6
CVE-2022-2601
A buffer overflow was found in grub_font_construct_glyph()
8.2
CVE-2021-20233
A flaw was found in grub2 in versions prior to 2.06
8.2
CVE-2020-25632
A flaw was found in grub2 in versions prior to 2.06
8.2
CVE-2020-10713
A flaw was found in grub2, prior to version 2.06