SUSE Security Update: Security update for the Linux Kernel
______________________________________________________________________________

Announcement ID:    SUSE-SU-2019:1823-2
Rating:             important
References:         #1096254 #1108382 #1109137 #1127155 #1133190 
                    #1133738 #1134395 #1134701 #1136922 #1136935 
                    #1137194 #1138291 #1140575 
Cross-References:   CVE-2018-20836 CVE-2019-10126 CVE-2019-10638
                    CVE-2019-10639 CVE-2019-11487 CVE-2019-11599
                    CVE-2019-12380 CVE-2019-12456 CVE-2019-12614
                    CVE-2019-12818 CVE-2019-12819
Affected Products:
                    SUSE Linux Enterprise High Availability 12-SP2
______________________________________________________________________________

   An update that solves 11 vulnerabilities and has two fixes
   is now available.

Description:


   The SUSE Linux Enterprise 12 SP 2 kernel was updated to receive various
   security and bugfixes.

   The following security bugs were fixed:

   - CVE-2019-10638: In the Linux kernel, a device could be tracked by an
     attacker using the IP ID values the kernel produces for connection-less
     protocols (e.g., UDP and ICMP). When such traffic was sent to multiple
     destination IP addresses, it was possible to obtain hash collisions (of
     indices to the counter array) and thereby obtain the hashing key (via
     enumeration). An attack may be conducted by hosting a crafted web page
     that uses WebRTC or gQUIC to force UDP traffic to attacker-controlled IP
     addresses. (bnc#1140575)
   - CVE-2019-10639: The Linux kernel allowed Information Exposure (partial
     kernel address disclosure), leading to a KASLR bypass. Specifically, it
     was possible to extract the KASLR kernel image offset using the IP ID
     values the kernel produces for connection-less protocols (e.g., UDP and
     ICMP). When such traffic was sent to multiple destination IP addresses,
     it was possible to obtain hash collisions (of indices to the counter
     array) and thereby obtain the hashing key (via enumeration). This key
     contains enough bits from a kernel address (of a static variable) so
     when the key was extracted (via enumeration), the offset of the kernel
     image is exposed. This attack can be carried out remotely, by the
     attacker forcing the target device to send UDP or ICMP (or certain
     other) traffic to attacker-controlled IP addresses. Forcing a server to
     send UDP traffic is trivial if the server is a DNS server. ICMP traffic
     is trivial if the server answers ICMP Echo requests (ping). For client
     targets, if the target visited the attacker's web page, then WebRTC or
     gQUIC could be used to force UDP traffic to attacker-controlled IP
     addresses. NOTE: this attack against KASLR became viable because IP ID
     generation was changed to have a dependency on an address associated
     with a network namespace. (bnc#)
   - CVE-2019-10126: A flaw was found in the Linux kernel that might lead to
     memory corruption in the marvell mwifiex driver. (bnc#1136935)
   - CVE-2018-20836: An issue was discovered in the Linux kernel There was a
     race condition in smp_task_timedout() and smp_task_done() in
     drivers/scsi/libsas/sas_expander.c, leading to a use-after-free.
     (bnc#1134395)
   - CVE-2019-11599: The coredump implementation in the Linux kernel did not
     use locking or other mechanisms to prevent vma layout or vma flags
     changes while it ran, which allowed local users to obtain sensitive
     information, cause a denial of service, or possibly have unspecified
     other impact by triggering a race condition with mmget_not_zero or
     get_task_mm calls. This is related to fs/userfaultfd.c, mm/mmap.c,
     fs/proc/task_mmu.c, and drivers/infiniband/core/uverbs_main.c.
     (bnc#1133738)
   - CVE-2019-12614: An issue was discovered in dlpar_parse_cc_property in
     arch/powerpc/platforms/pseries/dlpar.c in the Linux kernel There was an
     unchecked kstrdup of prop-name, which might allow an attacker to cause a
     denial of service (NULL pointer dereference and system crash). (bnc#)
   - CVE-2019-12818: An issue was discovered in the Linux kernel The
     nfc_llcp_build_tlv function in net/nfc/llcp_commands.c may return NULL.
     If the caller did not check for this, it will trigger a NULL pointer
     dereference. This will cause denial of service. This affects
     nfc_llcp_build_gb in net/nfc/llcp_core.c. (bnc#1137194)
   - CVE-2019-12819: An issue was discovered in the Linux kernel The function
     __mdiobus_register() in drivers/net/phy/mdio_bus.c called put_device(),
     which would trigger a fixed_mdio_bus_init use-after-free. This would
     cause a denial of service. (bnc#1138291)
   - CVE-2019-12456 a double-fetch bug in _ctl_ioctl_main() could allow local
     users to create a denial of service (bsc#1136922).
   - CVE-2019-12380: An issue was discovered in the efi subsystem in the
     Linux kernel phys_efi_set_virtual_address_map in
     arch/x86/platform/efi/efi.c and efi_call_phys_prolog in
     arch/x86/platform/efi/efi_64.c mishandle memory allocation failures.
     NOTE: This id is disputed as not being an issue because All the code
     touched by the referenced commit runs only at boot, before any user
     processes are started. Therefore, there is no possibility for an
     unprivileged user to control it. (bnc#)
   - CVE-2019-11487: The Linux kernel allowed page-_refcount reference count
     to overflow, with resultant use-after-free issues, if about 140 GiB of
     RAM exists. This is related to fs/fuse/dev.c, fs/pipe.c, fs/splice.c,
     include/linux/mm.h, include/linux/pipe_fs_i.h, kernel/trace/trace.c,
     mm/gup.c, and mm/hugetlb.c. It can occur with FUSE requests.
     (bnc#1133190)

   The following non-security bugs were fixed:

   - Drop multiversion(kernel) from the KMP template (bsc#1127155).
   - Revert "KMPs: obsolete older KMPs of the same flavour (bsc#1127155,
     bsc#1109137)." This reverts commit
     4cc83da426b53d47f1fde9328112364eab1e9a19.
   - sched/fair: Avoid divide by zero when rebalancing domains (bsc#1096254).
   - x86/cpu: Unify CPU family, model, stepping calculation (bsc#1134701).
   - x86/entry/64/compat: Fix stack switching for XEN PV (bsc#1108382).
   - x86/microcode/AMD: Fix initrd loading with CONFIG_RANDOMIZE_MEMORY=y
     (bsc#1134701).
   - x86/microcode/AMD: Fix load of builtin microcode with randomized memory
     (bsc#1134701).
   - x86/microcode/AMD: Reload proper initrd start address (bsc#1134701).
   - x86/microcode/amd: Hand down the CPU family (bsc#1134701).
   - x86/microcode/amd: Move private inlines to .c and mark local functions
     static (bsc#1134701).
   - x86/microcode/intel: Drop stashed AP patch pointer optimization
     (bsc#1134701).
   - x86/microcode/intel: Fix allocation size of struct ucode_patch
     (bsc#1134701).
   - x86/microcode/intel: Fix initrd loading with CONFIG_RANDOMIZE_MEMORY=y
     (bsc#1134701).
   - x86/microcode/intel: Remove intel_lib.c (bsc#1134701).
   - x86/microcode/intel: Remove unused arg of get_matching_model_microcode()
     (bsc#1134701).
   - x86/microcode/intel: Rename load_microcode_early() to
     find_microcode_patch() (bsc#1134701).
   - x86/microcode/intel: Rename local variables of type struct mc_saved_data
     (bsc#1134701).
   - x86/microcode/intel: Rename mc_intel variable to mc (bsc#1134701).
   - x86/microcode/intel: Rename mc_saved_in_initrd (bsc#1134701).
   - x86/microcode/intel: Simplify generic_load_microcode() (bsc#1134701).
   - x86/microcode/intel: Unexport save_mc_for_early() (bsc#1134701).
   - x86/microcode/intel: Use correct buffer size for saving microcode data
     (bsc#1134701).
   - x86/microcode: Collect CPU info on resume (bsc#1134701).
   - x86/microcode: Export the microcode cache linked list (bsc#1134701).
   - x86/microcode: Fix loading precedence (bsc#1134701).
   - x86/microcode: Get rid of find_cpio_data()'s dummy offset arg
     (bsc#1134701).
   - x86/microcode: Issue the debug printk on resume only on success
     (bsc#1134701).
   - x86/microcode: Rework microcode loading (bsc#1134701).
   - x86/microcode: Run the AP-loading routine only on the application
     processors (bsc#1134701).


Special Instructions and Notes:

   Please reboot the system after installing this update.

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 High Availability 12-SP2:

      zypper in -t patch SUSE-SLE-HA-12-SP2-2019-1823=1



Package List:

   - SUSE Linux Enterprise High Availability 12-SP2 (ppc64le s390x x86_64):

      cluster-md-kmp-default-4.4.121-92.117.1
      cluster-md-kmp-default-debuginfo-4.4.121-92.117.1
      cluster-network-kmp-default-4.4.121-92.117.1
      cluster-network-kmp-default-debuginfo-4.4.121-92.117.1
      dlm-kmp-default-4.4.121-92.117.1
      dlm-kmp-default-debuginfo-4.4.121-92.117.1
      gfs2-kmp-default-4.4.121-92.117.1
      gfs2-kmp-default-debuginfo-4.4.121-92.117.1
      kernel-default-debuginfo-4.4.121-92.117.1
      kernel-default-debugsource-4.4.121-92.117.1
      ocfs2-kmp-default-4.4.121-92.117.1
      ocfs2-kmp-default-debuginfo-4.4.121-92.117.1


References:

   https://www.suse.com/security/cve/CVE-2018-20836.html
   https://www.suse.com/security/cve/CVE-2019-10126.html
   https://www.suse.com/security/cve/CVE-2019-10638.html
   https://www.suse.com/security/cve/CVE-2019-10639.html
   https://www.suse.com/security/cve/CVE-2019-11487.html
   https://www.suse.com/security/cve/CVE-2019-11599.html
   https://www.suse.com/security/cve/CVE-2019-12380.html
   https://www.suse.com/security/cve/CVE-2019-12456.html
   https://www.suse.com/security/cve/CVE-2019-12614.html
   https://www.suse.com/security/cve/CVE-2019-12818.html
   https://www.suse.com/security/cve/CVE-2019-12819.html
   https://bugzilla.suse.com/1096254
   https://bugzilla.suse.com/1108382
   https://bugzilla.suse.com/1109137
   https://bugzilla.suse.com/1127155
   https://bugzilla.suse.com/1133190
   https://bugzilla.suse.com/1133738
   https://bugzilla.suse.com/1134395
   https://bugzilla.suse.com/1134701
   https://bugzilla.suse.com/1136922
   https://bugzilla.suse.com/1136935
   https://bugzilla.suse.com/1137194
   https://bugzilla.suse.com/1138291
   https://bugzilla.suse.com/1140575

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