CVE-2026-98393 net: ipv4: Fix UDP length overflow with PMTU discover and big MTU

In the Linux kernel, the following vulnerability has been resolved: net: ipv4: Fix UDP length overflow with PMTU discover and big MTU This commit bounds cork-base.fragsize to IPMAXMTU to avoid a possible overflow of UDP length that triggers a WARN in udpsetlenshort when setsockopt IPMTUDISCOVER i...

CVE-2026-98393

The Linux kernel contains a vulnerability where an overflow of the UDP length field can occur when using Path MTU Discovery (PMTUD) with a large MTU. Specifically, if a network device has an MTU greater than IP_MAX_MTU + 20 and setsockopt is set to IP_PMTUDISC_PROBE, the maxnonfragsize can exceed...