# CVE-2026-93283: Linux kernel i3c master use-after-free in device registration error path

Source: https://junglewise.ai/threats/cve-2026-93283-in-the-linux-kernel-the-following-vulnerability-has-been-resolved  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-24. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-93283 · Severity: info · Published 2026-09-24

The Linux kernel's I3C (Improved Inter-Integrated Circuit) master device driver contains a use-after-free vulnerability in error handling when device registration fails. When device_register() fails, freed memory is dereferenced later, potentially leading to kernel crashes or memory corruption on systems using I3C devices.

Technologies: [Linux kernel](https://junglewise.ai/threats/technologies/x-linux-kernel).

## Quick answers

**Is CVE-2026-93283 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-93283 being exploited in the wild.

**How severe is CVE-2026-93283?** Informational severity, published 24 September 2026.

**Which products and versions are affected?** Linux kernel affected versions prior to patch commit 74be657d98a8d684c0475f3cbd450ef2a30ffc73.

**Is there a fix for CVE-2026-93283?** A patch was published on 2026-07-02: commit 74be657d98a8d684c0475f3cbd450ef2a30ffc73 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-93283 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-93283?** Check whether you run Linux kernel at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

When device_register() fails in i3c_master_register_new_i3c_devs(), put_device() is called but leaves dangling pointers in the descriptor structure that can be dereferenced by subsequent code paths like i3c_master_unregister_i3c_devs(). The fix clears desc->dev->desc before calling put_device() and clears desc->dev afterward to prevent use-after-free.

## Affected products

- Linux kernel affected versions prior to patch commit 74be657d98a8d684c0475f3cbd450ef2a30ffc73

## Timeline

- 2026-09-24: disclosed
- 2026-07-02: patched: commit 74be657d98a8d684c0475f3cbd450ef2a30ffc73

## References

- [https://git.kernel.org/stable/c/20a2b6df91fd782ef2ff551febef594d0b46a9a7](https://git.kernel.org/stable/c/20a2b6df91fd782ef2ff551febef594d0b46a9a7)
- [https://git.kernel.org/stable/c/5bf498623f8397d45f85f14cd631c5e5a565c2fb](https://git.kernel.org/stable/c/5bf498623f8397d45f85f14cd631c5e5a565c2fb)

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