[El-errata] New Ksplice updates for RHCK 7 (ELSA-2019-1481)

Errata Announcements for Oracle Linux el-errata at oss.oracle.com
Tue Jun 18 08:41:47 PDT 2019

Synopsis: ELSA-2019-1481 can now be patched using Ksplice
CVEs: CVE-2019-11477 CVE-2019-11478 CVE-2019-11479

Users with Oracle Linux Premier Support can now use Ksplice to patch
against the latest Oracle Linux Security Advisory, ELSA-2019-1481.
More information about this errata can be found at


We recommend that all users of Ksplice Uptrack running RHCK 7 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


* CVE-2019-11477, CVE-2019-11478, CVE-2019-11479: Remote Denial-of-service in
TCP stack.

A number of errors in the TCP stack could result in a remotely
triggerable denial of service on links with a small Maximum Segment Size
(MSS).  A remote user could use a maliciously crafted TCP stream to
either panic the system or exhaust resources.

A new sysctl, ksplice_net_ipv4.tcp_min_snd_mss can be used to to adjust
the minimum Maximum Segment Size and defaults to 48 bytes.


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

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