CVE-2026-45962 ublk: Validate SQE128 flag before accessing the cmd
A missing flag check in the Linux kernel ublk driver allows out-of-bounds memory access, potentially leading to information disclosure or system crashes.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-45962?
CVE-2026-45962 is a medium-severity memory corruption vulnerability in Linux kernel, published on 27 May 2026. 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:
ublk: Validate SQE128 flag before accessing the cmd
ublk_ctrl_cmd_dump() accesses (header *)sqe->cmd before IO_URING_F_SQE128 flag check. This could cause out of boundary memory access.
Move the SQE128 flag check earlier in ublk_ctrl_uring_cmd() to return -EINVAL immediately if the flag is not set.
Which versions are affected by CVE-2026-45962?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-45962?
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-2026-45962 being exploited?
There is no known exploitation of CVE-2026-45962 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-45962, DEBIAN-CVE-2026-45962, GHSA-6w6r-q9pw-cwq6, ROOT-OS-UBUNTU-2404-CVE-2026-45962, UBUNTU-CVE-2026-45962.