CVE-2023-34256

Description

An issue was discovered in the Linux kernel before 6.3.3. There is an out-of-bounds read in crc16 in lib/crc16.c when called from fs/ext4/super.c because ext4_group_desc_csum does not properly check an offset. NOTE: this is disputed by third parties because the kernel is not intended to defend against attackers with the stated "When modifying the block device while it is mounted by the filesystem" access.

References

https://syzkaller.appspot.com/bug?extid=8785e41224a3afd04321

https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html

https://lists.debian.org/debian-lts-announce/2023/07/msg00030.html

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4f04351888a83e595571de672e0a4a8b74f4fb31

https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.3.3

https://bugzilla.suse.com/show_bug.cgi?id=1211895

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3