CVE-2022-3775: gnu grub2 Out-of-bounds Write
Vulnerability summary
CVE-2022-3775 is a high (CVSS 7.1) Out-of-bounds Write vulnerability in gnu grub2. EPSS estimates a 1.04% chance of exploitation in the next 30 days, higher than 63.5% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 21 · Related 11Timeline
- 19-12-2022PublishedVulnerability first disclosed.
- 27-05-2026Last modifiedVulnerability information updated.
Description
When rendering certain unicode sequences, grub2's font code doesn't proper validate if the informed glyph's width and height is constrained within bitmap size. As consequence an attacker can craft an input which will lead to a out-of-bounds write into grub2's heap, leading to memory corruption and availability issues. Although complex, arbitrary code execution could not be discarded.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated7.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
- NVDNIST7.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
EPSS trend
Probability
1.04%
Chance of exploitation in the next 30 days
Percentile
64%
Versus all other CVEs
30-day change
+0.17 pp
From 0.87% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu2 products
- grub2-signedAll versions (No fix recorded) | < 1.187.3~18.04.1 | < 1.187.3~20.04.1 | < 1.187.3~22.04.1
- grub2-unsignedAll versions (No fix recorded) | < 2.06-2ubuntu14.1 | < 2.06-2ubuntu14
Debian1 product
- grub2< 2.06-5
Gnu1 product
- grub2≤ 2.06
Redhat1 product
4 vendors · 5 products
References
8 links- access.redhat.com/security/cve/cve-2022-3775Third Party Advisory
- security.gentoo.org/glsa/202311-14Vendor Advisory
