Debian DSA-1845-1 : linux-2.6 - denial of service, privilege escalation


Several vulnerabilities have been discovered in the Linux kernel that may lead to a denial of service, or privilege escalation. The Common Vulnerabilities and Exposures project identifies the following problems : - CVE-2009-1895 Julien Tinnes and Tavis Ormandy reported an issue in the Linux personality code. Local users can take advantage of a setuid binary that can either be made to dereference a NULL pointer or drop privileges and return control to the user. This allows a user to bypass mmap_min_addr restrictions which can be exploited to execute arbitrary code. - CVE-2009-2287 Matt T. Yourst discovered an issue in the kvm subsystem. Local users with permission to manipulate /dev/kvm can cause a denial of service (hang) by providing an invalid cr3 value to the KVM_SET_SREGS call. - CVE-2009-2406 CVE-2009-2407 Ramon de Carvalho Valle discovered two issues with the eCryptfs layered filesystem using the fsfuzzer utility. A local user with permissions to perform an eCryptfs mount may modify the contents of a eCryptfs file, overflowing the stack and potentially gaining elevated privileges.