UBUNTU-CVE-2024-26773

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    UBUNTU-CVE-2024-26773

    Published: 3 Apr 2024Last Modified: 8 Oct 2026
    Upstream:
    CVE-2024-26773
    Aliases:
    USN-6820-1
    USN-6820-2
    USN-6821-1

    Summary:

    Details: In the Linux kernel, the following vulnerability has been resolved: ext4: avoid allocating blocks from corrupted group in ext4_mb_try_best_found() Determine if the group block bitmap is corrupted before using ac_b_ex in ext4_mb_try_best_found() to avoid allocating blocks from a group with a corrupted block bitmap in the following concurrency and making the situation worse. ext4_mb_regular_allocator ext4_lock_group(sb, group) ext4_mb_good_group // check if the group bbitmap is corrupted ext4_mb_complex_scan_group // Scan group gets ac_b_ex but doesn't use it ext4_unlock_group(sb, group) ext4_mark_group_bitmap_corrupted(group) // The block bitmap was corrupted during // the group unlock gap. ext4_mb_try_best_found ext4_lock_group(ac->ac_sb, group) ext4_mb_use_best_found mb_mark_used // Allocating blocks in block bitmap corrupted group

    References: https://ubuntu.com/security/CVE-2024-26773, https://git.kernel.org/linus/4530b3660d396a646aad91a787b6ab37cf604b53, https://git.kernel.org/stable/c/21f8cfe79f776287459343e9cfa6055af61328ea, https://git.kernel.org/stable/c/260fc96283c0f594de18a1b045faf6d8fb42874d, https://git.kernel.org/stable/c/927794a02169778c9c2e7b25c768ab3ea8c1dc03, https://git.kernel.org/stable/c/4c21fa60a6f4606f6214a38f50612b17b2f738f5, https://git.kernel.org/stable/c/f97e75fa4e12b0aa0224e83fcbda8853ac2adf36, https://git.kernel.org/stable/c/0184747b552d6b5a14db3b7fcc3b792ce64dedd1, https://git.kernel.org/stable/c/a2576ae9a35c078e488f2c573e9e6821d651fbbe, https://git.kernel.org/stable/c/4530b3660d396a646aad91a787b6ab37cf604b53, https://www.cve.org/CVERecord?id=CVE-2024-26773, https://ubuntu.com/security/notices/USN-6820-1, https://ubuntu.com/security/notices/USN-6821-1, https://ubuntu.com/security/notices/USN-6821-2, https://ubuntu.com/security/notices/USN-6828-1, https://ubuntu.com/security/notices/USN-6820-2, https://ubuntu.com/security/notices/USN-6821-3, https://ubuntu.com/security/notices/USN-6831-1, https://ubuntu.com/security/notices/USN-6821-4, https://ubuntu.com/security/notices/USN-6867-1, https://ubuntu.com/security/notices/USN-6871-1, https://ubuntu.com/security/notices/USN-6892-1, https://ubuntu.com/security/notices/USN-6919-1

    Affected packages

    Package

    Name: linux

    Purl: pkg:deb/ubuntu/linux?arch=source&distro=esm-infra-legacy%2Ftrusty

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    3.11.0-12.19

    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-2024-26773 | CVE-DB