CVE-2014-9419

La función The __switch_to en arch/x86/kernel/process_64.c en el Kernel de Linux a través de 3.18.1 no asegura que los descriptores Thread Local Storage (TLS) se carguen antes de proceder con otros pasos, lo que que sea más fácil para los usuarios locales evadir el mecanismo de protección ASLR a través de una aplicación modificada que lee una dirección base TLS

An information leak flaw was found in the way the Linux kernel changed certain segment registers and thread-local storage (TLS) during a context switch. A local, unprivileged user could use this flaw to leak the user space TLS base address of an arbitrary process.

Multiple vulnerabilities has been found and corrected in the Linux kernel. The Crypto API in the Linux kernel before 3.18.5 allows local users to load arbitrary kernel modules via a bind system call for an AF_ALG socket with a module name in the salg_name field, a different vulnerability than CVE-2014-9644. arch/x86/kvm/vmx.c in the KVM subsystem in the Linux kernel before 3.17.2 on Intel processors does not ensure that the value in the CR4 control register remains the same after a VM entry, which allows host OS users to kill arbitrary processes or cause a denial of service by leveraging /dev/kvm access, as demonstrated by PR_SET_TSC prctl calls within a modified copy of QEMU. Various other issues have also been addressed. The updated packages provides a solution for these security issues.