i3c: Fix unlocked dereference of dev->desc in i3c_device_get_supported_xfer_mode() (CVE-2026-80954) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-80954

i3c: Fix unlocked dereference of dev->desc in i3c_device_get_supported_xfer_mode()

Answer in brief

CVE-2026-80954 records a Unknown severity vulnerability in i3c: Fix unlocked dereference of dev->desc in i3c_device_get_supported_xfer_mode(). 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 11, 2026Updated Sep 11, 2026Source checked Sep 11, 2026First seen by HOL Sep 11, 2026Material review Sep 11, 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	>=256a21743d911f94ce92fe28f793cd586f3860b2 <251db58324ea4792c3f9f692ab09be148e051969 \|\| >=256a21743d911f94ce92fe28f793cd586f3860b2 <8bed7f4fa710914b7f05fd59998316bfb4d43385	251db58324ea4792c3f9f692ab09be148e051969, 8bed7f4fa710914b7f05fd59998316bfb4d43385
Linux/Linuxgeneric	6.19	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 251db58324ea4792c3f9f692ab09be148e051969 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 11, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.