Kmalloc-256

Ubuntu Linux Kernel PPPoL2TP Use-After-Free Local Privilege Escalation (CVE-2026-68398)

CVE-2026-68398 is a use-after-free race condition between PPPoL2TP receive processing and destruction of a bound-but-unattached PPP channel in the Linux kernel. The PPPoX socket and its embedded pppchannel are RCU-safe, but the internal struct channel used by…