CVE-2023-52579 Information

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.

Reference

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