CVE-2024-26773

2024-04-0300:00:00

ubuntu.com

linux kernel

vulnerability

ext4

block allocation

corrupted group

concurrency

situation worse

group bitmap

allocator

group unlock

group lock

block bitmap

unix

AI Score

7.6

Confidence

High

EPSS

Percentile

13.0%

JSON

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

OSVersionArchitecturePackageVersionFilename
ubuntu20.04noarchlinux< 5.4.0-186.206UNKNOWN
ubuntu22.04noarchlinux< 5.15.0-112.122UNKNOWN
ubuntu18.04noarchlinux-hwe-5.4< 5.4.0-186.206~18.04.1UNKNOWN
ubuntu20.04noarchlinux-hwe-5.15< 5.15.0-113.123~20.04.1UNKNOWN
ubuntu22.04noarchlinux-kvm< 5.15.0-1060.65UNKNOWN
ubuntu20.04noarchlinux-kvm< 5.4.0-1114.121UNKNOWN
ubuntu20.04noarchlinux-aws< 5.4.0-1126.136UNKNOWN
ubuntu22.04noarchlinux-aws< 5.15.0-1063.69UNKNOWN
ubuntu18.04noarchlinux-aws-5.4< 5.4.0-1126.136~18.04.1UNKNOWN
ubuntu20.04noarchlinux-aws-5.15< 5.15.0-1063.69~20.04.1UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	20.04	noarch	linux	< 5.4.0-186.206	UNKNOWN
ubuntu	22.04	noarch	linux	< 5.15.0-112.122	UNKNOWN
ubuntu	18.04	noarch	linux-hwe-5.4	< 5.4.0-186.206~18.04.1	UNKNOWN
ubuntu	20.04	noarch	linux-hwe-5.15	< 5.15.0-113.123~20.04.1	UNKNOWN
ubuntu	22.04	noarch	linux-kvm	< 5.15.0-1060.65	UNKNOWN
ubuntu	20.04	noarch	linux-kvm	< 5.4.0-1114.121	UNKNOWN
ubuntu	20.04	noarch	linux-aws	< 5.4.0-1126.136	UNKNOWN
ubuntu	22.04	noarch	linux-aws	< 5.15.0-1063.69	UNKNOWN
ubuntu	18.04	noarch	linux-aws-5.4	< 5.4.0-1126.136~18.04.1	UNKNOWN
ubuntu	20.04	noarch	linux-aws-5.15	< 5.15.0-1063.69~20.04.1	UNKNOWN