[El-errata] New Ksplice updates for UEKR5 4.14.35 on OL7 (ELSA-2019-4836)

[Errata Announcements for Oracle Linux]

Synopsis: ELSA-2019-4836 can now be patched using Ksplice
CVEs: CVE-2018-12207 CVE-2019-11135 CVE-2019-14284 CVE-2019-15916

Users with Oracle Linux Premier Support can now use Ksplice to patch
against the latest Oracle Linux Security Advisory, ELSA-2019-4836.
More information about this errata can be found at
https://linux.oracle.com/errata/ELSA-2019-4836.html

INSTALLING THE UPDATES

We recommend that all users of Ksplice Uptrack running UEKR5 4.14.35
on 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: 29967630


* CVE-2019-15916: Memory leak when registering a kobject associated to a net device.

A missing free of resources when registering a kobject for a net device
fails could lead to a memory leak. A local attacker could use this flaw
to exhaust kernel memory and cause a denial-of-service.

Orabug: 30350262


* Kernel crash in Reliable Datagram Socket RDMA pool management.

A logic error when tracking items in an RDMA pool can result in a reference
count exceeding its maximum limit, leading to a kernel crash.

Orabug: 30397933


* Information leak in LSI MPT Fusion SAS ioctl() handling.

A race condition when validating device identifiers could allow a local
user with access to one device to perform commands on another device
that they should not have permission for.

Orabug: 30299961


* CVE-2019-14284: Denial-of-service in floppy disk formatting.

A division by zero in the setup_format_params function for the floppy
disk driver could result in a kernel crash.  A local user with access to
the floppy disk device could use this flaw to crash the system.

Orabug: 30447842


* Use-after-free during mpt3sas expander reset.

A failure to correctly clear memory when performing a reset of an mpt3sas
expander could result in the access of freed memory, leading to a
undefined behavior or a kernel crash.

Orabug: 30299961


* NULL pointer dereference during ring buffer iteration in XEN network frontend driver.

A logic error in the Xen network frontend driver resulted in a valid return code to
be interpreted as an error. In certain circumstances, this could lead to a NULL
pointer dereference, resulting in a kernel crash.

Orabug: 30395404


* Denial-of-service when receiving packets over tcp sockets.

A logic error when receiving packets over tcp sockets could lead to a
kernel assert. A local attacker could use this flaw to cause a
denial-of-service.

Orabug: 30331228


* Kernel crash in MPT3SAS when HBA doesn't support NVMe protocol.

If any faulty application issues an NVMe Encapsulated commands to HBA which
doesn't support NVMe protocol then a kernel crash might happen due to missing
error handling.

Orabug: 30376510


* 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.

Orabug: 30419234

SUPPORT

Ksplice support is available at ksplice-support_ww at oracle.com.