CVE-2023-53803 scsi: ses: Fix slab-out-of-bounds in ses_enclosure_data_process()
A slab-out-of-bounds read in the Linux kernel SES driver can cause a system crash, requiring a kernel patch to prevent denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-53803?
CVE-2023-53803 is a high-severity memory corruption vulnerability in Linux, published on 9 Dec 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
scsi: ses: Fix slab-out-of-bounds in ses_enclosure_data_process()
A fix for:
BUG: KASAN: slab-out-of-bounds in ses_enclosure_data_process+0x949/0xe30 [ses] Read of size 1 at addr ffff88a1b043a451 by task systemd-udevd/3271
Checking after (and before in next loop) addl_desc_ptr[1] is sufficient, we expect the size to be sanitized before first access to addl_desc_ptr[1]. Make sure we don't walk beyond end of page.
Which versions are affected by CVE-2023-53803?
How do I fix CVE-2023-53803?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2023-53803 being exploited?
There is no known exploitation of CVE-2023-53803 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2023-53803, DEBIAN-CVE-2023-53803, GHSA-7mw7-q5qp-mcqq, UBUNTU-CVE-2023-53803.