Improper Handling of Values Affecting kernel package, versions <0:4.14.343-259.562.amzn2

Note: Versions mentioned in the description apply only to the upstream kernel package and not the kernel package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

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

• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-26773
• https://git.kernel.org/stable/c/0184747b552d6b5a14db3b7fcc3b792ce64dedd1
• https://git.kernel.org/stable/c/21f8cfe79f776287459343e9cfa6055af61328ea
• https://git.kernel.org/stable/c/260fc96283c0f594de18a1b045faf6d8fb42874d
• https://git.kernel.org/stable/c/4530b3660d396a646aad91a787b6ab37cf604b53
• https://git.kernel.org/stable/c/4c21fa60a6f4606f6214a38f50612b17b2f738f5
• https://git.kernel.org/stable/c/927794a02169778c9c2e7b25c768ab3ea8c1dc03
• https://git.kernel.org/stable/c/a2576ae9a35c078e488f2c573e9e6821d651fbbe
• https://git.kernel.org/stable/c/f97e75fa4e12b0aa0224e83fcbda8853ac2adf36
• https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
• https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html