Vulnerability CVE-2023-52579
Published: 2024-03-02

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

ipv4: fix null-deref in ipv4_link_failure

Currently, we assume the skb is associated with a device before calling
__ip_options_compile, which is not always the case if it is re-routed by
ipvs.
When skb->dev is NULL, dev_net(skb->dev) will become null-dereference.
This patch adds a check for the edge case and switch to use the net_device
from the rtable when skb->dev is NULL.

 References:
https://git.kernel.org/stable/c/084c7ac9e8d60bf21a423490021b7c3427312955
https://git.kernel.org/stable/c/a2cf7bd75b3992e8df68dd5fdc6499b67d45f6e0
https://git.kernel.org/stable/c/810fd23d9715474aa27997584e8fc9396ef3cb67
https://git.kernel.org/stable/c/8689c9ace976d6c078e6dc844b09598796e84099
https://git.kernel.org/stable/c/8860d354f653628b6330e1c5b06b2828948135a4
https://git.kernel.org/stable/c/2712545e535d7a2e4c53b9c9658a9c88c6055862
https://git.kernel.org/stable/c/cda20fcddf53f0f959641c8ef4d50ab87ffa5124
https://git.kernel.org/stable/c/0113d9c9d1ccc07f5a3710dac4aa24b6d711278c
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