Vulnerability CVE-2023-52509
Published: 2024-03-02

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

ravb: Fix use-after-free issue in ravb_tx_timeout_work()

The ravb_stop() should call cancel_work_sync(). Otherwise,
ravb_tx_timeout_work() is possible to use the freed priv after
ravb_remove() was called like below:

CPU0 CPU1
ravb_tx_timeout()
ravb_remove()
unregister_netdev()
free_netdev(ndev)
// free priv
ravb_tx_timeout_work()
// use priv

unregister_netdev() will call .ndo_stop() so that ravb_stop() is
called. And, after phy_stop() is called, netif_carrier_off()
is also called. So that .ndo_tx_timeout() will not be called
after phy_stop().

 References:
https://git.kernel.org/stable/c/65d34cfd4e347054eb4193bc95d9da7eaa72dee5
https://git.kernel.org/stable/c/db9aafa19547833240f58c2998aed7baf414dc82
https://git.kernel.org/stable/c/616761cf9df9af838c0a1a1232a69322a9eb67e6
https://git.kernel.org/stable/c/6f6fa8061f756aedb93af12a8a5d3cf659127965
https://git.kernel.org/stable/c/105abd68ad8f781985113aee2e92e0702b133705
https://git.kernel.org/stable/c/3971442870713de527684398416970cf025b4f89
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