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    CVE-2022-3775

    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.

    Published:Nov 15, 2022
    Last Modified:May 27, 2026
    EPS:Dec 19, 2022
    EPSS Score:0.00078
    CVSS Score:7.1

    Affected Products

    Vendor
    Gnu
    Product
    Grub2
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Rhel Aus
    Vendor
    Redhat
    Product
    Rhel E4s
    Vendor
    Redhat
    Product
    Rhel Eus
    Vendor
    Redhat
    Product
    Rhel Tus

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-787 Out-of-bounds Write

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2024-45779 (CVSS 6) — An integer overflow flaw was found in the BFS file system driver in grub2. When reading a file with an indirec…
    CVE-2025-1125 (CVSS 7.8) — When reading data from a hfs filesystem, grub's hfs filesystem module uses user-controlled parameters from the…
    CVE-2024-45777 (CVSS 6.7) — A flaw was found in grub2. The calculation of the translation buffer when reading a language .mo file in grub_…
    CVE-2025-0686 (CVSS 6.4) — A flaw was found in grub2. When performing a symlink lookup from a romfs filesystem, grub's romfs filesystem m…
    CVE-2025-0689 (CVSS 7.8) — When reading data from disk, the grub's UDF filesystem module utilizes the user controlled data length metadat…
    CVE-2025-0684 (CVSS 6.4) — A flaw was found in grub2. When performing a symlink lookup from a reiserfs filesystem, grub's reiserfs fs mod…
    CVE-2025-0685 (CVSS 6.4) — A flaw was found in grub2. When reading data from a jfs filesystem, grub's jfs filesystem module uses user-con…
    CVE-2024-45782 (CVSS 7.8) — A flaw was found in the HFS filesystem. When reading an HFS volume's name at grub_fs_mount(), the HFS filesyst…
    CVE-2024-45778 (CVSS 4.1) — A stack overflow flaw was found when reading a BFS file system. A crafted BFS filesystem may lead to an uncont…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High