CVE-2026-43099

Summary

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".

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxd329ea5bd8845f0b196bf41b18b6173340d6e0e4 < 0f21bc261e60f0c696c58841c4873ff77ed83673affected
LinuxLinuxd329ea5bd8845f0b196bf41b18b6173340d6e0e4 < dc5db4db19766a61ad65d81d1f55b1c1e51ba78daffected
LinuxLinuxd329ea5bd8845f0b196bf41b18b6173340d6e0e4 < 47a8bf52156ac7e7a581eca31c1f964ba4258d4daffected
LinuxLinuxd329ea5bd8845f0b196bf41b18b6173340d6e0e4 < 6be325206850a0891896d38bcf83a09d8b54ec48affected
LinuxLinuxd329ea5bd8845f0b196bf41b18b6173340d6e0e4 < f91b3ed9e7fa82a70511b5f6901c88379acf2964affected
LinuxLinuxd329ea5bd8845f0b196bf41b18b6173340d6e0e4 < 5b9911582d441f72fe6ccb15ffe3303bbc07f6f5affected
LinuxLinuxd329ea5bd8845f0b196bf41b18b6173340d6e0e4 < fde29fd9349327acc50d19a0b5f3d5a6c964dfd8affected
LinuxLinux5.13affected
LinuxLinux0 < 5.13unaffected
LinuxLinux5.15.209 <= 5.15.*unaffected
LinuxLinux6.1.175 <= 6.1.*unaffected
LinuxLinux6.6.136 <= 6.6.*unaffected
LinuxLinux6.12.83 <= 6.12.*unaffected
LinuxLinux6.18.24 <= 6.18.*unaffected
LinuxLinux6.19.14 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References