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    CVE-2023-34256

    An issue was discovered in the Linux kernel before 6.3.3. There is an out-of-bounds read in crc16 in lib/crc16.c when called from fs/ext4/super.c because ext4_group_desc_csum does not properly check an offset. NOTE: this is disputed by third parties because the kernel is not intended to defend against attackers with the stated "When modifying the block device while it is mounted by the filesystem" access.

    Published:May 31, 2023
    Last Modified:Mar 11, 2025
    EPS:May 31, 2023
    EPSS Score:0.00016
    CVSS Score:5.5

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Linux
    Product
    Linux Kernel
    Vendor
    Suse
    Product
    Linux Enterprise

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-125 Out-of-bounds Read

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

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    References

    https://bugzilla.suse.com/show_bug.cgi?id=1211895
    https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.3.3
    https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4f04351888a83e595571de672e0a4a8b74f4fb31
    https://lists.debian.org/debian-lts-announce/2023/07/msg00030.html
    https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html
    https://syzkaller.appspot.com/bug?extid=8785e41224a3afd04321
    https://bugzilla.suse.com/show_bug.cgi?id=1211895
    https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.3.3
    https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4f04351888a83e595571de672e0a4a8b74f4fb31
    https://lists.debian.org/debian-lts-announce/2023/07/msg00030.html
    https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html
    https://syzkaller.appspot.com/bug?extid=8785e41224a3afd04321

    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