CVE-2026-98359

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

RDMA/core: Reject unregistering netdevs in ib_get_eth_speed

ib_device_get_netdev() intentionally returns a referenced net_device even

when it is unregistering, so matching and cleanup callers can still find

the association. The reference keeps struct net_device allocated, but does

not guarantee that the device remains operational.

ib_get_eth_speed() uses the returned device operationally by invoking its

ethtool callback. Although that call is made under RTNL, the function does

not verify the registration state first. An asynchronous RDMA port query

can therefore call into a netdev after NETDEV_UNREGISTER and ndo_uninit

have completed.

Check for NETREG_REGISTERED while holding RTNL and return -ENODEV for a

device which is being unregistered. Keeping RTNL across the check and the

ethtool operation prevents unregister from starting between them.

Keep the speed fallback and warning under RTNL as well, so the warning c

/// 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