In the md driver (drivers/md/md.c) of the Linux kernel it’s possible to request a bitmap file for a device using get_bitmap_file(), which uses kmalloc(). When bitmap is disabled, only the first byte of the buffer is initialized to zero, and then the whole buffer is copied in user space. It's possible to read up to 4095 bytes of kernel space memory from user space. This results in local kernel information leak. Upstream patch: http://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/?id=77ba0569d4c8389c0a2162ab0c7c16a6f3b199e4 CVE assignment: http://seclists.org/oss-sec/2015/q3/235
Created kernel tracking bugs for this issue: Affects: fedora-all [bug 1249013]
kernel-4.1.4-200.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.
kernel-4.1.4-100.fc21 has been pushed to the Fedora 21 stable repository. If problems still persist, please make note of it in this bug report.
kernel-4.1.5-200.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.
kernel-4.1.5-100.fc21 has been pushed to the Fedora 21 stable repository. If problems still persist, please make note of it in this bug report.
Statement: This issue affects the Linux kernels as shipped with Red Hat Enterprise Linux 5, 6, 7, MRG-2 and realtime and may be addressed in a future update.