FreeBSD -- Multiple vulnerabilities in POSIX largepage objects

Problem Description: Pages belonging to largepage shared memory objects were not explicitly wired. When sendfile2 transmitted such an object with the SFNOCACHE flag, it freed the underlying pages after transmission even though existing mappings still referred to them. CVE-2026-49427 Separately,...

The vulnerability of the `sys_perf_event_open()` function in the Linux operating system’s perf subsystem allows a local attacker to gain root privileges.

The vulnerability of the sysperfeventopen function in the Linux operating system’s perf subsystem stems from the race condition within this subsystem. This condition can be exploited to initiate access to a freed memory area in the kernel. Exploiting this vulnerability allows a local attacker to...