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Change History

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

ipv4: icmp: fix null-ptr-deref in icmp_build_probe()

ipv6_stub->ipv6_dev_find() may return ERR_PTR(-EAFNOSUPPORT) when the
IPv6 stack is not active (CONFIG_IPV6=m and not loaded), and passing
this error pointer to dev_hold() will cause a kernel crash with
null-ptr-deref.

Instead, silently discard the request. RFC 8335 does not appear to
define a specific response for the case where an IPv6 interface
identifier is syntactically valid but the implementation cannot perform
the lookup at runtime, and silently dropping the request may safer than
misreporting "No Such Interface".

https://git.kernel.org/stable/c/47a8bf52156ac7e7a581eca31c1f964ba4258d4d

https://git.kernel.org/stable/c/5b9911582d441f72fe6ccb15ffe3303bbc07f6f5

https://git.kernel.org/stable/c/6be325206850a0891896d38bcf83a09d8b54ec48

https://git.kernel.org/stable/c/f91b3ed9e7fa82a70511b5f6901c88379acf2964

https://git.kernel.org/stable/c/fde29fd9349327acc50d19a0b5f3d5a6c964dfd8