Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

CVE-2026-63992

Gravedad CVSS v3.1:
CRÍTICA
Tipo:
No Disponible / Otro tipo
Fecha de publicación:
19/07/2026
Última modificación:
30/07/2026

Descripción

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> tunnels: do not assume transport header in iptunnel_pmtud_check_icmp()<br /> <br /> In some cases, iptunnel_pmtud_check_icmp() can be called while<br /> skb transport header is not set.<br /> <br /> This triggers an out-of-bound access, because<br /> (typeof(skb-&gt;transport_header))~0U is 65535.<br /> <br /> Access the icmp header based on IPv4 network header,<br /> after making sure icmp-&gt;type is present in skb linear part.<br /> <br /> Note that iptunnel_pmtud_check_icmpv6()) is fine.