Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | < 6.3.3 |
| Suse | Linux Enterprise | 12.0 |
| Debian | Debian Linux | 10.0 |
Related Weaknesses (CWE)
References
- https://bugzilla.suse.com/show_bug.cgi?id=1211895Issue TrackingPatchThird Party Advisory
- https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.3.3Mailing ListPatch
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4fMailing ListPatch
- https://lists.debian.org/debian-lts-announce/2023/07/msg00030.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/10/msg00027.htmlMailing ListThird Party Advisory
- https://syzkaller.appspot.com/bug?extid=8785e41224a3afd04321Mailing ListPatch
- https://bugzilla.suse.com/show_bug.cgi?id=1211895Issue TrackingPatchThird Party Advisory
- https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.3.3Mailing ListPatch
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4fMailing ListPatch
- https://lists.debian.org/debian-lts-announce/2023/07/msg00030.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/10/msg00027.htmlMailing ListThird Party Advisory
- https://syzkaller.appspot.com/bug?extid=8785e41224a3afd04321Mailing ListPatch
FAQ
What is CVE-2023-34256?
CVE-2023-34256 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 a...
How severe is CVE-2023-34256?
CVE-2023-34256 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2023-34256?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Suse Linux Enterprise, Debian Debian Linux.