SUSE-SU-2018:1636-1: important: Security update for the Linux Kernel (Live Patch 10 for SLE 12 SP3)

[sle-security-updates at lists.suse.com]

   SUSE Security Update: Security update for the Linux Kernel (Live Patch 10 for SLE 12 SP3)
______________________________________________________________________________

Announcement ID:    SUSE-SU-2018:1636-1
Rating:             important
References:         #1083125 #1090368 #1090646 #1090869 
Cross-References:   CVE-2018-1087 CVE-2018-8781 CVE-2018-8897
                   
Affected Products:
                    SUSE Linux Enterprise Live Patching 12-SP3
______________________________________________________________________________

   An update that solves three vulnerabilities and has one
   errata is now available.

Description:

   This update for the Linux Kernel 4.4.120-94_17 fixes several issues.

   The following security issues were fixed:

   - CVE-2018-8897: A statement in the System Programming Guide of the Intel
     64 and IA-32 Architectures Software Developer's Manual (SDM) was
     mishandled in the development of some or all operating-system kernels,
     resulting in unexpected behavior for #DB exceptions that are deferred by
     MOV SS or POP SS, as demonstrated by (for example) privilege escalation
     in Windows, macOS, some Xen configurations, or FreeBSD, or a Linux
     kernel crash. The MOV to SS and POP SS instructions inhibit interrupts
     (including NMIs), data breakpoints, and single step trap exceptions
     until the instruction boundary following the next instruction (SDM Vol.
     3A; section 6.8.3). (The inhibited data breakpoints are those on memory
     accessed by the MOV to SS or POP to SS instruction itself.) Note that
     debug exceptions are not inhibited by the interrupt enable (EFLAGS.IF)
     system flag (SDM Vol. 3A; section 2.3). If the instruction following the
     MOV to SS or POP to SS instruction is an instruction like SYSCALL,
     SYSENTER, INT 3, etc. that transfers control to the operating system at
     CPL < 3, the debug exception is delivered after the transfer to CPL < 3
     is complete. OS kernels may not expect this order of events and may
     therefore experience unexpected behavior when it occurs (bsc#1090368).
   - CVE-2018-8781: The udl_fb_mmap function in drivers/gpu/drm/udl/udl_fb.c
     had an integer-overflow vulnerability allowing local users with access
     to the udldrmfb driver to obtain full read and write permissions on
     kernel physical pages, resulting in a code execution in kernel space
     (bsc#1090646).
   - bsc#1083125: Fixed kgraft: small race in reversion code
   - CVE-2018-1087: kernel KVM was vulnerable to a flaw in the way the Linux
     kernel's KVM hypervisor handled exceptions delivered after a stack
     switch operation via Mov SS or Pop SS instructions. During the stack
     switch operation, the processor did not deliver interrupts and
     exceptions, rather they are delivered once the first instruction after
     the stack switch is executed. An unprivileged KVM guest user could use
     this flaw to crash the guest or, potentially, escalate their privileges
     in the guest (bsc#1090869) before


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 Live Patching 12-SP3:

      zypper in -t patch SUSE-SLE-Live-Patching-12-SP3-2018-1110=1



Package List:

   - SUSE Linux Enterprise Live Patching 12-SP3 (ppc64le x86_64):

      kgraft-patch-4_4_120-94_17-default-3-2.1
      kgraft-patch-4_4_120-94_17-default-debuginfo-3-2.1


References:

   https://www.suse.com/security/cve/CVE-2018-1087.html
   https://www.suse.com/security/cve/CVE-2018-8781.html
   https://www.suse.com/security/cve/CVE-2018-8897.html
   https://bugzilla.suse.com/1083125
   https://bugzilla.suse.com/1090368
   https://bugzilla.suse.com/1090646
   https://bugzilla.suse.com/1090869