CVE-2026-23437

Description

In the Linux kernel, the following vulnerability has been resolved: net: shaper: protect late read accesses to the hierarchy We look up a netdev during prep of Netlink ops (pre- callbacks) and take a ref to it. Then later in the body of the callback we take its lock or RCU which are the actual protections. This is not proper, a conversion from a ref to a locked netdev must include a liveness check (a check if the netdev hasn't been unregistered already). Fix the read cases (those under RCU). Writes needs a separate change to protect from creating the hierarchy after flush has already run.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

References

• https://git.kernel.org/stable/c/581eee0890a8bde44f1fb78ad3e70502a897d583 ↗
• https://git.kernel.org/stable/c/348758ba74e6a348299965b16a97cfb817545cc0 ↗
• https://git.kernel.org/stable/c/0f9ea7141f365b4f27226898e62220fb98ef8dc6 ↗