net: stmmac: initialize ptp_lock at probe time

Answer in brief

CVE-2026-97963 records a Unknown severity vulnerability in net: stmmac: initialize ptp_lock at probe time. 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 25, 2026Updated Sep 25, 2026Source checked Sep 25, 2026First seen by HOL Sep 25, 2026Material review Sep 25, 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	>=b60189e0392fa06348911077ef281eb2b1047b6a <420315413b29635de1d4ea4142e410e6465260f3 \|\| >=b60189e0392fa06348911077ef281eb2b1047b6a <25cc0096efba83b4e0e6fa50f03e9543b41e9d3d \|\| >=b60189e0392fa06348911077ef281eb2b1047b6a <b1986595cf827c38ff929e22fbc9ca8f76379306 \|\| >=b60189e0392fa06348911077ef281eb2b1047b6a <0338c68e22abd2ee509ec2e32508a50896618c32	420315413b29635de1d4ea4142e410e6465260f3, 25cc0096efba83b4e0e6fa50f03e9543b41e9d3d, b1986595cf827c38ff929e22fbc9ca8f76379306, 0338c68e22abd2ee509ec2e32508a50896618c32
Linux/Linuxgeneric	5.6	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 420315413b29635de1d4ea4142e410e6465260f3 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 25, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: net: stmmac: initialize ptp_lock at probe time priv->ptp_lock is only initialized in stmmac_ptp_register(), which runs during __stmmac_open(). However, the lock is also used while the interface is down and has never been opened: tc_taprio_configure() invokes the PTP gettime64() callback to compute the EST base time when offloading a TAPRIO schedule, and stmmac_get_time() takes priv->ptp_lock. Using an uninitialized rwlock is undefined behaviour. Move the rwlock_init() to __stmmac_dvr_probe(), together with the other private locks, so that ptp_lock is always valid regardless of the interface state.

Quoted source text, attributed separately from HOL analysis.