CVE-2024-26704

2024-04-0300:00:00

ubuntu.com

linux kernel

ext4

double-free

block

vulnerability

7.5 High

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

13.1%

JSON

In the Linux kernel, the following vulnerability has been resolved: ext4:
fix double-free of blocks due to wrong extents moved_len In
ext4_move_extents(), moved_len is only updated when all moves are
successfully executed, and only discards orig_inode and donor_inode
preallocations when moved_len is not zero. When the loop fails to exit
after successfully moving some extents, moved_len is not updated and
remains at 0, so it does not discard the preallocations. If the moved
extents overlap with the preallocated extents, the overlapped extents are
freed twice in ext4_mb_release_inode_pa() and ext4_process_freed_data() (as
described in commit 94d7c16cbbbd (“ext4: Fix double-free of blocks with
EXT4_IOC_MOVE_EXT”)), and bb_free is incremented twice. Hence when trim is
executed, a zero-division bug is triggered in mb_update_avg_fragment_size()
because bb_free is not zero and bb_fragments is zero. Therefore, update
move_len after each extent move to avoid the issue.

OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchlinux< 4.15.0-225.237UNKNOWN
ubuntu20.04noarchlinux< 5.4.0-181.201UNKNOWN
ubuntu22.04noarchlinux< 5.15.0-106.116UNKNOWN
ubuntu23.10noarchlinux< 6.5.0-35.35UNKNOWN
ubuntu24.04noarchlinux< anyUNKNOWN
ubuntu14.04noarchlinux< anyUNKNOWN
ubuntu16.04noarchlinux< 4.4.0-254.288UNKNOWN
ubuntu18.04noarchlinux-aws< 4.15.0-1168.181UNKNOWN
ubuntu20.04noarchlinux-aws< 5.4.0-1124.134UNKNOWN
ubuntu22.04noarchlinux-aws< 5.15.0-1061.67UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	18.04	noarch	linux	< 4.15.0-225.237	UNKNOWN
ubuntu	20.04	noarch	linux	< 5.4.0-181.201	UNKNOWN
ubuntu	22.04	noarch	linux	< 5.15.0-106.116	UNKNOWN
ubuntu	23.10	noarch	linux	< 6.5.0-35.35	UNKNOWN
ubuntu	24.04	noarch	linux	< any	UNKNOWN
ubuntu	14.04	noarch	linux	< any	UNKNOWN
ubuntu	16.04	noarch	linux	< 4.4.0-254.288	UNKNOWN
ubuntu	18.04	noarch	linux-aws	< 4.15.0-1168.181	UNKNOWN
ubuntu	20.04	noarch	linux-aws	< 5.4.0-1124.134	UNKNOWN
ubuntu	22.04	noarch	linux-aws	< 5.15.0-1061.67	UNKNOWN