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Change History

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

genetlink: fix genl_bind() invoking bind() after -EPERM

Per family bind/unbind callbacks were introduced to allow families
to track multicast group consumer presence, e.g. to start or stop
producing events depending on listeners.

However, in genl_bind() the bind() callback was invoked even if
capability checks failed and ret was set to -EPERM. This means that
callbacks could run on behalf of unauthorized callers while the
syscall still returned failure to user space.

Fix this by only invoking bind() after "if (ret) break;" check
i.e. after permission checks have succeeded.

https://git.kernel.org/stable/c/1dbfb0363224f6da56f6655d596dc5097308d6f5

https://git.kernel.org/stable/c/8858c1e9405906c09589d7c336f04058ea198207

https://git.kernel.org/stable/c/98c9d884047a3051c203708914a874dece3cbe54