CVE-2024-56738
CVE-2024-56738 is a medium-severity vulnerability in Gnu Grub2 with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-203.
Key facts
- Severity: Medium (CVSS 3.x base score 5.3)
- EPSS exploit prediction: 0% (31st percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2024-53381
- Weakness: CWE-203
- Affected product: Gnu Grub2
- Published:
- Last modified:
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.
Frequently asked questions
- What is 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.
- How severe is CVE-2024-56738?
- CVE-2024-56738 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
- Is CVE-2024-56738 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2024-56738?
- CVE-2024-56738 affects Gnu Grub2. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2024-56738?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2024-56738 have an EU (EUVD) identifier?
- Yes. CVE-2024-56738 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-53381.
- When was CVE-2024-56738 published?
- CVE-2024-56738 was published on 2024-12-29 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:gnu:grub2:*:*:*:*:*:*:*:*
More vulnerabilities in Gnu Grub2
- CVE-2024-56737 — High (CVSS 8.8): GNU GRUB (aka GRUB2) through 2.12 has a heap-based buffer overflow in fs/hfs.c via crafted sblock data in an HFS…
- CVE-2022-2601 — High (CVSS 8.6): A buffer overflow was found in grub_font_construct_glyph(). A malicious crafted pf2 font can lead to an overflow when…
- CVE-2021-20233 — High (CVSS 8.2): A flaw was found in grub2 in versions prior to 2.06. Setparam_prefix() in the menu rendering code performs a length…
- CVE-2020-25632 — High (CVSS 8.2): A flaw was found in grub2 in versions prior to 2.06. The rmmod implementation allows the unloading of a module used as…
- CVE-2020-10713 — High (CVSS 8.2): A flaw was found in grub2, prior to version 2.06. An attacker may use the GRUB 2 flaw to hijack and tamper the GRUB…
- CVE-2022-28734 — High (CVSS 8.1): Out-of-bounds write when handling split HTTP headers; When handling split HTTP headers, GRUB2 HTTP code accidentally…
All CVEs affecting Gnu Grub2 →
Other CWE-203 (Observable Discrepancy) vulnerabilities
- CVE-2019-25337 — Critical (CVSS 9.8): OwnCloud 8.1.8 contains a username enumeration vulnerability that allows remote attackers to discover user accounts by…
- CVE-2026-23519 — Critical (CVSS 9.8): RustCrypto CMOV provides conditional move CPU intrinsics which are guaranteed on major platforms to execute in…
- CVE-2025-27667 — Critical (CVSS 9.8): Vasion Print (formerly PrinterLogic) before Virtual Appliance Host 22.0.843 Application 20.0.1923 allows Administrative…
- CVE-2024-25714 — Critical (CVSS 9.8): In Rhonabwy through 1.1.13, HMAC signature verification uses a strcmp function that is vulnerable to side-channel…
- CVE-2024-25191 — Critical (CVSS 9.8): php-jwt 1.0.0 uses strcmp (which is not constant time) to verify authentication, which makes it easier to bypass…
- CVE-2024-25190 — Critical (CVSS 9.8): l8w8jwt 2.2.1 uses memcmp (which is not constant time) to verify authentication, which makes it easier to bypass…
Browse all CWE-203 (Observable Discrepancy) vulnerabilities →