net: stmmac: initialize ptp_lock at probe time
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.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.15.222, 6.1.189, 6.12.111, 6.18.53, 6.6.158, 7.2.7
- CVEs
- CVE-2026-97963
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 7 Nov 2026, 10:02 UTC · Revision 1
Source evidence
net: stmmac: initialize ptp_lock at probe time
core-osv · Original sourcePublished 25 Sept 2026, 10:23 UTC
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.
osv:CVE-2026-97963
Kernel
Fixed versions: 5.15.222, 6.1.189, 6.6.158, 6.12.111, 6.18.53, 7.2.7
Complete source record
{
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"url": "https://osv.dev/vulnerability/CVE-2026-97963",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "net: stmmac: initialize ptp_lock at probe time",
"summary": "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.",
"evidence": "osv:CVE-2026-97963",
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"modified": "2026-10-28T02:30:50.239467070Z",
"provider": "osv",
"references": [
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"evidence": "/id"
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"security_relevant": true,
"severity_evidence": null
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"source_id": "core-osv",
"document_id": 518953,
"published_at": "2026-09-25T10:23:06.749+00:00"
}