CVE-2026-90144

/// Technical description

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

dpll: fix NULL deref in dpll_device_ops() during teardown race

When the last owner of a dpll device unregisters while a foreign driver

still holds a pin on it via dpll_pin_on_pin_register(), the dpll object

stays alive with an empty registration list. A pin notification queued

before the unregister (e.g. ice reacting to zl3073x_i2c removal) then

walks pin->dpll_refs into dpll_device_ops(), which trips the WARN_ON and

dereferences the missing registration. dpll_lock cannot help because the

notification work was queued before the unregistering driver took the

lock.

Treat the empty registration list as a legitimate transient state. Make

dpll_priv() and dpll_device_ops() return NULL in that case and make

every pin netlink path that resolves a device from a pin skip such

dplls. dpll_cmd_pin_get_one() picks a ref with a live registration and

returns -ENODEV when there is none, the pin dumpit skips such a pin

instead of ab

/// 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