Debian Security Advisory 1378-1 - Several local and remote vulnerabilities have been discovered in the Linux kernel that may lead to a denial of service or the execution of arbitrary code. Evan Teran discovered a potential local denial of service (oops) in the handling of PTRACE_SETREGS and PTRACE_SINGLESTEP requests. Adam Litke reported a potential local denial of service (oops) on powerpc platforms resulting from unchecked VMA expansion into address space reserved for hugetlb pages. Steve French reported that CIFS filesystems with CAP_UNIX enabled were not honoring a process' umask which may lead to unintentionally relaxed permissions. Wojciech Purczynski discovered a vulnerability that can be exploited by a local user to obtain superuser privileges on x86_64 systems. This resulted from improper clearing of the high bits of registers during ia32 system call emulation. This vulnerability is relevant to the Debian amd64 port as well as users of the i386 port who run the amd64 linux-image flavor. Michael Stone reported an issue with the JFFS2 filesystem. Legacy modes for inodes that were created with POSIX ACL support enabled were not being written out to the medium, resulting in incorrect permissions upon remount.
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