New Ksplice updates for UEKR4 4.1.12 has been released for both Oracle Linux 6 and 7 to address security issues on some Intel CPUs
Synopsis: ELSA-2019-4837 can now be patched using Ksplice
CVEs: CVE-2018-12207 CVE-2019-11135
Users with Oracle Linux Premier Support can now use Ksplice to patch
against the latest Oracle Linux Security Advisory, ELSA-2019-4837.
More information about this errata can be found at
https://linux.oracle.com/errata/ELSA-2019-4837.html
INSTALLING THE UPDATES
We recommend that all users of Ksplice Uptrack running UEKR4 4.1.12 on
OL6 and OL7 install these updates.
On systems that have "autoinstall = yes" in /etc/uptrack/uptrack.conf,
these updates will be installed automatically and you do not need to
take any action.
Alternatively, you can install these updates by running:
# /usr/sbin/uptrack-upgrade -y
DESCRIPTION
* CVE-2018-12207: Machine Check Exception on page size change.
A hardware bug in Intel x86 processors can result in a Machine Check Exception
when a page table mapping for currently executing instructions is changed. A
privileged user in a guest VM could use this flaw to crash the host, leading to
a denial-of-service.
Orabug: 29967631
* CVE-2019-11135: Side-channel information leak in Intel TSX.
A side-channel information leak on some generations of Intel processors
could allow the leaking of internal microarchitectural buffers during
asynchronous aborts in a TSX transaction. For CPUs that are vulnerable
to Microarchitectural Data Sampling, existing mitigations cover
CVE-2019-11135, for newer CPUs with hardware fixes for MDS, TSX is
transparently disabled. On these newer CPUs, TSX functionality can be
restored by writing 0 to /sys/kernel/debug/x86/tsx_force_abort.
SUPPORT
Ksplice support is available at ksplice-support_ww@oracle.com.
