UBUNTU-CVE-2012-2100

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    UBUNTU-CVE-2012-2100

    Published: 12 Apr 2012Last Modified: 4 Feb 2026
    Upstream:
    CVE-2012-2100
    Aliases:
    USN-1384-1
    USN-1388-1
    USN-1389-1

    Summary:

    Details: The ext4_fill_flex_info function in fs/ext4/super.c in the Linux kernel before 3.2.2, on the x86 platform and unspecified other platforms, allows user-assisted remote attackers to trigger inconsistent filesystem-groups data and possibly cause a denial of service via a malformed ext4 filesystem containing a super block with a large FLEX_BG group size (aka s_log_groups_per_flex value). NOTE: this vulnerability exists because of an incomplete fix for CVE-2009-4307.

    References: https://ubuntu.com/security/CVE-2012-2100, http://www.openwall.com/lists/oss-security/2012/04/12/11, https://ubuntu.com/security/notices/USN-1405-1, https://ubuntu.com/security/notices/USN-1388-1, https://ubuntu.com/security/notices/USN-1404-1, https://ubuntu.com/security/notices/USN-1389-1, https://ubuntu.com/security/notices/USN-1432-1, https://ubuntu.com/security/notices/USN-1440-1, https://ubuntu.com/security/notices/USN-1458-1, https://ubuntu.com/security/notices/USN-1384-1, https://www.cve.org/CVERecord?id=CVE-2012-2100

    Affected packages

    Package

    Name: linux

    Purl: pkg:deb/ubuntu/[email protected]?arch=source&distro=trusty

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -3.11.0-12.19

    Affected versions

    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
    UBUNTU-CVE-2012-2100 | CVE-DB