CVE-2026-53021 scsi: target: core: Fix integer overflow in UNMAP bounds check
An integer overflow in the Linux kernel SCSI target UNMAP handler allows attackers to bypass bounds checks, potentially causing denial of service or unauthorized data access.
- 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-2026-53021?
CVE-2026-53021 is a medium-severity vulnerability in Linux kernel, published on 24 Jun 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:
scsi: target: core: Fix integer overflow in UNMAP bounds check
sbc_execute_unmap() checks LBA + range does not exceed the device capacity, but does not guard against LBA + range wrapping around on 64-bit overflow.
Add an overflow check matching the pattern already used for WRITE_SAME in the same file.
Weakness: CWE-190
Which versions are affected by CVE-2026-53021?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-53021?
Apply the vendor's patch.
Is CVE-2026-53021 being exploited?
There is no known exploitation of CVE-2026-53021 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-53021, DEBIAN-CVE-2026-53021, GHSA-mw2m-v92w-q9ww, ROOT-OS-DEBIAN-11-CVE-2026-53021, ROOT-OS-DEBIAN-12-CVE-2026-53021, ROOT-OS-UBUNTU-2204-CVE-2026-53021 and 2 more.