SUSE Security Update: Security update for the Linux Kernel (Live Patch 0 for SLE 15)
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Announcement ID:    SUSE-SU-2018:2474-1
Rating:             important
References:         #1097108 #1099258 #1099306 #1102682 #1103203 
                    
Cross-References:   CVE-2017-18344 CVE-2018-10853 CVE-2018-12904
                    CVE-2018-3646 CVE-2018-5390
Affected Products:
                    SUSE Linux Enterprise Module for Live Patching 15
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   An update that fixes 5 vulnerabilities is now available.

Description:

   This update for the Linux Kernel 4.12.14-23 fixes several issues.

   The following security issues were fixed:

   - CVE-2018-5390: Linux kernel versions 4.9+ can be forced to make very
     expensive calls to tcp_collapse_ofo_queue() and tcp_prune_ofo_queue()
     for every incoming packet which can lead to a denial of service
     (bsc#1102682).
   - CVE-2018-3646: Local attackers in virtualized guest systems could use
     speculative code patterns on hyperthreaded processors to read data
     present in the L1 Datacache used by other hyperthreads on the same CPU
     core, potentially leaking sensitive data, even from other virtual
     machines or the host system (bsc#1099306).
   - CVE-2017-18344: The timer_create syscall implementation in
     kernel/time/posix-timers.c didn't properly validate the
     sigevent->sigev_notify field, which lead to out-of-bounds access in the
     show_timer function (called when /proc/$PID/timers is read). This
     allowed userspace applications to read arbitrary kernel memory (on a
     kernel built with CONFIG_POSIX_TIMERS and CONFIG_CHECKPOINT_RESTORE)
     (bsc#1103203). before 4.14.8
   - CVE-2018-12904: In arch/x86/kvm/vmx.c local attackers could cause L1 KVM
     guests to VMEXIT, potentially allowing privilege escalations and denial
     of service attacks due to lack of checking of CPL (bsc#1099258).
   - CVE-2018-10853: A flaw was found in kvm. In which certain instructions
     such as sgdt/sidt call segmented_write_std didn't propagate access
     correctly. As such, during userspace induced exception, the guest can
     incorrectly assume that the exception happened in the kernel and panic.
     (bsc#1097108).


Patch Instructions:

   To install this SUSE Security Update use the SUSE recommended installation methods
   like YaST online_update or "zypper patch".

   Alternatively you can run the command listed for your product:

   - SUSE Linux Enterprise Module for Live Patching 15:

      zypper in -t patch SUSE-SLE-Module-Live-Patching-15-2018-1739=1



Package List:

   - SUSE Linux Enterprise Module for Live Patching 15 (ppc64le x86_64):

      kernel-livepatch-4_12_14-23-default-2-4.1
      kernel-livepatch-4_12_14-23-default-debuginfo-2-4.1
      kernel-livepatch-SLE15_Update_0-debugsource-2-4.1


References:

   https://www.suse.com/security/cve/CVE-2017-18344.html
   https://www.suse.com/security/cve/CVE-2018-10853.html
   https://www.suse.com/security/cve/CVE-2018-12904.html
   https://www.suse.com/security/cve/CVE-2018-3646.html
   https://www.suse.com/security/cve/CVE-2018-5390.html
   https://bugzilla.suse.com/1097108
   https://bugzilla.suse.com/1099258
   https://bugzilla.suse.com/1099306
   https://bugzilla.suse.com/1102682
   https://bugzilla.suse.com/1103203