USN-3582-1: Linux kernel vulnerabilities

Releases

• Ubuntu 16.04 ESM

Packages

• linux - Linux kernel
• linux-aws - Linux kernel for Amazon Web Services (AWS) systems
• linux-kvm - Linux kernel for cloud environments
• linux-raspi2 - Linux kernel for Raspberry Pi 2
• linux-snapdragon - Linux kernel for Snapdragon processors

Details

Mohamed Ghannam discovered that the IPv4 raw socket implementation in the
Linux kernel contained a race condition leading to uninitialized pointer
usage. A local attacker could use this to cause a denial of service or
possibly execute arbitrary code. (CVE-2017-17712)

Laurent Guerby discovered that the mbcache feature in the ext2 and ext4
filesystems in the Linux kernel improperly handled xattr block caching. A
local attacker could use this to cause a denial of service. (CVE-2015-8952)

Vitaly Mayatskikh discovered that the SCSI subsystem in the Linux kernel
did not properly track reference counts when merging buffers. A local
attacker could use this to cause a denial of service (memory exhaustion).
(CVE-2017-12190)

ChunYu Wang discovered that a use-after-free vulnerability existed in the
SCTP protocol implementation in the Linux kernel. A local attacker could
use this to cause a denial of service (system crash) or possibly execute
arbitrary code, (CVE-2017-15115)

Mohamed Ghannam discovered a use-after-free vulnerability in the DCCP
protocol implementation in the Linux kernel. A local attacker could use
this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2017-8824)

USN-3540-1 mitigated CVE-2017-5715 (Spectre Variant 2) for the
amd64 architecture in Ubuntu 16.04 LTS. This update provides the
compiler-based retpoline kernel mitigation for the amd64 and i386
architectures. Original advisory details:

Jann Horn discovered that microprocessors utilizing speculative execution
and branch prediction may allow unauthorized memory reads via sidechannel
attacks. This flaw is known as Spectre. A local attacker could use this to
expose sensitive information, including kernel memory. (CVE-2017-5715)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 16.04

• linux-image-4.4.0-1019-kvm - 4.4.0-1019.24
• linux-image-4.4.0-1052-aws - 4.4.0-1052.61
• linux-image-4.4.0-1085-raspi2 - 4.4.0-1085.93
• linux-image-4.4.0-1087-snapdragon - 4.4.0-1087.92
• linux-image-4.4.0-116-generic - 4.4.0-116.140
• linux-image-4.4.0-116-generic-lpae - 4.4.0-116.140
• linux-image-4.4.0-116-lowlatency - 4.4.0-116.140
• linux-image-4.4.0-116-powerpc-e500mc - 4.4.0-116.140
• linux-image-4.4.0-116-powerpc-smp - 4.4.0-116.140
• linux-image-4.4.0-116-powerpc64-emb - 4.4.0-116.140
• linux-image-4.4.0-116-powerpc64-smp - 4.4.0-116.140

After a standard system update you need to reboot your computer to make
all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.

References

• CVE-2015-8952
• CVE-2017-12190
• CVE-2017-15115
• CVE-2017-17712
• CVE-2017-5715
• CVE-2017-8824

Related notices

• USN-3582-2: linux-image-4.4.0-116-powerpc-e500mc, linux-image-4.4.0-116-powerpc64-emb, linux-lts-xenial, linux-image-4.4.0-116-powerpc-smp, linux-image-4.4.0-116-generic, linux-image-extra-4.4.0-116-generic, linux-image-4.4.0-116-lowlatency, linux-aws, linux-image-4.4.0-116-powerpc64-smp, linux-image-4.4.0-1014-aws, linux-image-4.4.0-116-generic-lpae
• USN-3487-1: linux-raspi2, linux, linux-image-lowlatency, linux-image-4.13.0-1006-raspi2, linux-image-generic, linux-image-raspi2, linux-image-4.13.0-17-lowlatency, linux-image-4.13.0-17-generic, linux-image-generic-lpae, linux-image-4.13.0-17-generic-lpae
• USN-3583-2: linux-image-3.13.0-142-generic-lpae, linux-image-generic-lpae-lts-trusty, linux-image-generic-lts-trusty, linux-image-3.13.0-142-generic, linux-lts-trusty
• USN-3583-1: linux, linux-image-extra-3.13.0-142-generic, linux-image-3.13.0-142-lowlatency, linux-image-3.13.0-142-powerpc-e500mc, linux-image-3.13.0-142-powerpc64-emb, linux-image-3.13.0-142-generic-lpae, linux-image-3.13.0-142-powerpc64-smp, linux-image-3.13.0-142-powerpc-smp, linux-image-3.13.0-142-powerpc-e500, linux-image-3.13.0-142-generic
• USN-3581-1: linux, linux-image-lowlatency, linux-image-generic, linux-image-4.13.0-36-lowlatency, linux-image-4.13.0-36-generic-lpae, linux-image-generic-lpae, linux-image-4.13.0-36-generic
• USN-3581-3: linux-raspi2, linux-image-raspi2, linux-image-4.13.0-1014-raspi2
• USN-3581-2: linux-image-4.13.0-1011-azure, linux-image-extra-4.13.0-1011-gcp, linux-image-4.13.0-36-lowlatency, linux-hwe, linux-image-4.13.0-36-generic-lpae, linux-image-extra-4.13.0-1011-azure, linux-image-4.13.0-1021-oem, linux-oem, linux-image-4.13.0-1011-gcp, linux-azure, linux-gcp, linux-image-extra-4.13.0-36-generic, linux-image-4.13.0-36-generic
• USN-3530-1: gir1.2-webkit2-4.0, libwebkit2gtk-4.0-dev, libjavascriptcoregtk-4.0-dev, libjavascriptcoregtk-4.0-18, libwebkit2gtk-4.0-37, libwebkit2gtk-4.0-37-gtk2, gir1.2-javascriptcoregtk-4.0, webkit2gtk, libwebkit2gtk-4.0-doc, libjavascriptcoregtk-4.0-bin
• USN-3594-1: linux-image-3.13.0-143-powerpc-smp, linux-image-3.13.0-143-powerpc-e500, linux, linux-image-3.13.0-143-generic-lpae, linux-image-3.13.0-143-generic, linux-image-3.13.0-143-lowlatency, linux-image-3.13.0-143-powerpc64-emb, linux-image-3.13.0-143-powerpc-e500mc, linux-image-3.13.0-143-powerpc64-smp, linux-image-extra-3.13.0-143-generic
• USN-3580-1: linux, linux-image-3.2.0-133-generic-pae, linux-image-generic, linux-image-generic-pae, linux-image-3.2.0-133-generic
• USN-3620-2: linux-image-3.13.0-144-generic-lpae, linux-image-generic-lpae-lts-trusty, linux-image-3.13.0-144-generic, linux-image-generic-lts-trusty, linux-lts-trusty
• USN-3541-2: linux-image-4.13.0-1007-gcp, linux-image-4.13.0-1006-azure, linux-image-extra-4.13.0-1007-gcp, linux-image-4.13.0-1017-oem, linux-hwe, linux-image-extra-4.13.0-31-generic, linux-image-4.13.0-31-generic, linux-image-extra-4.13.0-1006-azure, linux-oem, linux-image-4.13.0-31-generic-lpae, linux-azure, linux-gcp, linux-image-4.13.0-31-lowlatency
• USN-3531-3: intel-microcode
• USN-3560-1: qemu-user, qemu-system, qemu-common, qemu-system-ppc, qemu-system-misc, qemu-system-common, qemu-block-extra, qemu-system-mips, qemu-system-sparc, qemu-system-x86, qemu-system-aarch64, qemu-user-binfmt, qemu-kvm, qemu-user-static, qemu-guest-agent, qemu, qemu-utils, qemu-keymaps, qemu-system-arm, qemu-system-s390x
• USN-3531-1: intel-microcode
• USN-3540-1: linux-image-4.4.0-112-generic, linux-image-4.4.0-112-generic-lpae, linux, linux-euclid, linux-image-4.4.0-112-powerpc-e500mc, linux-image-4.4.0-112-powerpc64-emb, linux-image-extra-4.4.0-9023-euclid, linux-image-4.4.0-112-lowlatency, linux-image-extra-4.4.0-112-generic, linux-image-4.4.0-112-powerpc64-smp, linux-image-4.4.0-9023-euclid, linux-aws, linux-image-4.4.0-1049-aws, linux-image-4.4.0-112-powerpc-smp
• USN-3540-2: linux-image-4.4.0-111-generic, linux-image-extra-4.4.0-111-generic, linux-image-4.4.0-111-powerpc-e500mc, linux-image-4.4.0-111-generic-lpae, linux-image-4.4.0-111-powerpc64-emb, linux-image-4.4.0-111-powerpc64-smp, linux-image-4.4.0-111-powerpc-smp, linux-image-4.4.0-1011-aws, linux-lts-xenial, linux-aws, linux-image-4.4.0-111-lowlatency
• USN-3561-1: libvirt0, libvirt, libvirt-doc, libvirt-bin, libvirt-dev
• USN-3549-1: linux-image-4.4.0-1017-kvm, linux-kvm
• USN-3777-3: linux-image-unsigned-4.15.0-1025-azure, linux-azure
• USN-3690-1: amd64-microcode
• USN-3597-2: linux-image-4.13.0-37-generic-lpae, linux-hwe, linux-image-4.13.0-37-generic, linux-image-extra-4.13.0-37-generic, linux-image-4.13.0-37-lowlatency
• USN-3516-1: firefox-locale-fy, firefox-locale-en, firefox-locale-mr, firefox-locale-lv, firefox-locale-oc, firefox-locale-el, firefox-locale-br, firefox-locale-da, firefox-locale-lg, firefox-locale-ro, firefox-locale-csb, firefox-locale-nl, firefox-locale-ja, firefox-locale-mai, firefox-locale-sq, firefox-locale-gu, firefox-locale-ms, firefox-locale-mn, firefox-locale-tr, firefox-locale-az, firefox-locale-cy, firefox-locale-ast, firefox-locale-nn, firefox-locale-et, firefox-locale-eo, firefox-locale-sr, firefox-locale-cs, firefox-locale-ga, firefox-locale-gd, firefox-locale-gn, firefox-locale-hi, firefox-locale-pa, firefox-locale-hy, firefox-locale-bs, firefox-locale-pl, firefox-locale-kab, firefox-locale-ca, firefox-locale-gl, firefox-locale-as, firefox-locale-bn, firefox-locale-ml, firefox-locale-nso, firefox-locale-xh, firefox-locale-be, firefox-locale-ko, firefox-locale-km, firefox-locale-ru, firefox-locale-de, firefox-locale-fa, firefox-locale-uz, firefox-locale-kn, firefox-globalmenu, firefox-locale-zh-hans, firefox-locale-mk, firefox-locale-th, firefox-locale-ar, firefox-locale-bg, firefox-locale-cak, firefox-locale-sw, firefox-locale-af, firefox-locale-zh-hant, firefox-locale-nb, firefox-mozsymbols, firefox-locale-id, firefox-locale-hu, firefox, firefox-locale-te, firefox-locale-my, firefox-locale-or, firefox-locale-zu, firefox-locale-it, firefox-locale-kk, firefox-locale-si, firefox-locale-sv, firefox-locale-es, firefox-locale-hr, firefox-locale-ku, firefox-locale-hsb, firefox-locale-ur, firefox-locale-lt, firefox-locale-uk, firefox-locale-ta, firefox-locale-eu, firefox-locale-vi, firefox-testsuite, firefox-locale-fi, firefox-dev, firefox-locale-sk, firefox-locale-he, firefox-locale-is, firefox-locale-ka, firefox-locale-an, firefox-locale-sl, firefox-locale-pt, firefox-locale-fr
• USN-3541-1: linux, linux-image-lowlatency, linux-image-generic, linux-image-4.13.0-31-generic, linux-image-4.13.0-31-lowlatency
• USN-3597-1: linux, linux-image-lowlatency, linux-image-4.13.0-37-generic-lpae, linux-image-generic, linux-image-raspi2, linux-image-4.13.0-37-generic, linux-image-4.13.0-37-lowlatency, linux-image-4.13.0-1015-raspi2, linux-image-generic-lpae, linux-raspi2
• USN-3542-1: linux, linux-image-3.13.0-141-generic-lpae, linux-image-3.13.0-141-powerpc-smp, linux-image-extra-3.13.0-141-generic, linux-image-3.13.0-141-generic, linux-image-3.13.0-141-powerpc-e500mc, linux-image-3.13.0-141-lowlatency, linux-image-3.13.0-141-powerpc64-smp, linux-image-3.13.0-141-powerpc-e500, linux-image-3.13.0-141-powerpc64-emb
• USN-3542-2: linux-image-generic-lts-trusty, linux-image-3.13.0-140-generic, linux-lts-trusty