CVE-2026-80992
Received Received - Intake

Ravb Network Driver PTP Clock Dereference Vulnerability

Publication date: 2026-09-11

Last updated on: 2026-09-11

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: net: ravb: avoid dereferencing an invalid PTP clock The PTP clock is unavailable before the first open, so querying its index can dereference a NULL pointer. Registration failures can also leave an error pointer in priv->ptp.clock. Cache the PHC index separately and report -1 while no clock is registered. Normalize registration errors to NULL and preserve the static timestamping capabilities.

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Meta Information

Published
2026-09-11
Last Modified
2026-09-11
Generated
2026-09-12
AI Q&A
2026-09-11
EPSS Evaluated
N/A
NVD
CVE-2026-80992
EUVD
EUVD-2026-76315

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves a NULL pointer dereference in the ravb network driver's PTP (Precision Time Protocol) clock handling. The issue occurs because the PTP clock is not available before the first open operation, and querying its index can lead to dereferencing a NULL pointer. Additionally, registration failures may leave an error pointer in the private structure, causing further issues.

Detection Guidance

This vulnerability involves a NULL pointer dereference in the Linux kernel's ravb driver related to PTP clock handling. Detection requires checking kernel logs for errors in the ravb module or PTP clock operations. Look for messages indicating NULL pointer dereferences or registration failures in dmesg or system logs.

Impact Analysis

This vulnerability could cause system crashes or instability in systems using the ravb network driver with PTP clock functionality. It may lead to denial-of-service conditions if the NULL pointer dereference triggers kernel panics or unexpected behavior in time-sensitive network operations.

Mitigation Strategies

Update the Linux kernel to the latest stable version that includes the fix for this vulnerability. If updating is not immediately possible, consider disabling the ravb driver or PTP clock functionality if not required. Monitor kernel logs for any related errors after applying mitigations.

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