EUVD-2026-18678
GHSA-9wj8-78x3-52f8
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3Description
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.
Analysis
Linux kernel net shaper module fails to validate netdev liveness during hierarchy read operations, allowing information disclosure through use-after-free conditions when a network device is unregistered while RCU-protected read operations are in progress. The vulnerability affects the netlink operation callbacks in the shaper subsystem, where references acquired during pre-callbacks are not validated before later lock/RCU acquisitions, creating a race condition that can expose kernel memory or cause denial of service. …
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