CVE-2026-99196
UnknownSummary
In the Linux kernel, the au1000 network driver calls au1000_mii_probe() and attaches the PHY before dev->netdev_ops is assigned. Since netdev_need_ops_lock() was introduced, phy_attach_direct() reads dev->netdev_ops, causing a NULL pointer dereference and a crash during probe when CONFIG_NET_SHAPER is enabled.
Risk Assessment
A kernel crash during network interface initialization can cause denial of service or system instability on platforms using this driver. It requires CONFIG_NET_SHAPER to be enabled and specific hardware.
Recommendation
Update the kernel to a version containing the fix that assigns netdev_ops before PHY attach. Until then, consider disabling CONFIG_NET_SHAPER on affected platforms.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: net: au1000: move setting of netops to fix crash au1000_probe() calls au1000_mii_probe(), which connects the PHY, before dev->netdev_ops is assigned. phy_attach_direct() -> phy_link_topo_add_phy() reads dev->netdev_ops through netdev_need_ops_lock() since the commit in question, so probing crashes with a NULL pointer dereference when CONFIG_NET_SHAPER is enabled. Assign netdev_ops before the PHY attach, as was done for emac in commit 7c9f391ec89c ("net: emac: move setting of netops to fix crash").
Vulnerability data from NVD (NIST) · CISA KEV · EPSS