CVE-2026-43099

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".