It was found that Linux kernel's ptrace subsystem did not properly
sanitize psw mask value. On s390 systems, an unprivileged local user
could use this flaw to set address space control bits to kernel space
combination and thus gain read/write access to kernel memory.
This issue did not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6 and Red Hat Enterprise MRG 2.
Created kernel tracking bugs for this issue:
Affects: fedora-all [bug 1122612]
Red Hat would like to thank Martin Schwidefsky of IBM for reporting this issue.
kernel-3.15.7-200.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report.
It was found that Linux kernel's ptrace subsystem did not properly sanitize the address-space-control bits when the program-status word (PSW) was being set. On IBM S/390 systems, a local, unprivileged user could use this flaw to set address-space-control bits to the kernel space, and thus gain read and write access to kernel memory.
This issue has been addressed in following products:
Red Hat Enterprise Linux 7
Via RHSA-2014:1023 https://rhn.redhat.com/errata/RHSA-2014-1023.html
kernel-3.14.15-100.fc19 has been pushed to the Fedora 19 stable repository. If problems still persist, please make note of it in this bug report.