CVE-2026-97963

/// Technical 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.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References