i3c: master: Fix use-after-free of master->this

Answer in brief

CVE-2026-93200 records a Unknown severity vulnerability in i3c: master: Fix use-after-free of master->this. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 17, 2026Updated Sep 17, 2026Source checked Sep 17, 2026First seen by HOL Sep 17, 2026Material review Sep 17, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 <4f3145db05fede36b35f8249b8acde5bd5d54864 \|\| >=3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 <50034d8d0f797c3a7a599f750a7d3e792e80dea5 \|\| >=3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 <feb0ed76601f3c2f91f08688c5a7d8b9d382f720	4f3145db05fede36b35f8249b8acde5bd5d54864, 50034d8d0f797c3a7a599f750a7d3e792e80dea5, feb0ed76601f3c2f91f08688c5a7d8b9d382f720
Linux/Linuxgeneric	5.0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 4f3145db05fede36b35f8249b8acde5bd5d54864 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 17, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: i3c: master: Fix use-after-free of master->this sysfs attribute callbacks for the master controller device dereference master->this. However, master->this is freed in i3c_master_detach_free_devs() before the master device itself is released. As a result, sysfs accesses can dereference a freed master->this pointer, leading to a use-after-free. Keep master->this alive until i3c_masterdev_release(), which is called after the master device and its sysfs state are being torn down. Do not free master->this as part of the normal device detach path. On the error path in i3c_master_set_info(), reset master->this and bus.cur_master to NULL before freeing the allocated device.

Quoted source text, attributed separately from HOL analysis.