PT-2026-37409 · Linux · Linux

Published 2026-05-06 · Updated 2026-05-06 · CVE-2026-43099

NVD

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".

Related Identifiers

CVE-2026-43099

Affected Products

Linux

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-43099 · Security Note
• https://git.kernel.org/stable/c/5b9911582d441f72fe6ccb15ffe3303bbc07f6f5 · Note
• https://git.kernel.org/stable/c/f91b3ed9e7fa82a70511b5f6901c88379acf2964 · Note
• https://git.kernel.org/stable/c/47a8bf52156ac7e7a581eca31c1f964ba4258d4d · Note
• https://git.kernel.org/stable/c/6be325206850a0891896d38bcf83a09d8b54ec48 · Note
• https://git.kernel.org/stable/c/fde29fd9349327acc50d19a0b5f3d5a6c964dfd8 · Note