USN-3523-1: Linux kernel vulnerabilities

Releases

• Ubuntu 17.10

Packages

• linux - Linux kernel

Details

Jann Horn discovered that microprocessors utilizing speculative execution
and indirect branch prediction may allow unauthorized memory reads via
sidechannel attacks. This flaw is known as Meltdown. A local attacker could
use this to expose sensitive information, including kernel memory.
(CVE-2017-5754)

Jann Horn discovered that the Berkeley Packet Filter (BPF) implementation
in the Linux kernel did not properly check the relationship between pointer
values and the BPF stack. A local attacker could use this to cause a denial
of service (system crash) or possibly execute arbitrary code.
(CVE-2017-17863)

Jann Horn discovered that the Berkeley Packet Filter (BPF) implementation
in the Linux kernel improperly performed sign extension in some situations.
A local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2017-16995)

Alexei Starovoitov discovered that the Berkeley Packet Filter (BPF)
implementation in the Linux kernel contained a branch-pruning logic issue
around unreachable code. A local attacker could use this to cause a denial
of service. (CVE-2017-17862)

Jann Horn discovered that the Berkeley Packet Filter (BPF) implementation
in the Linux kernel mishandled pointer data values in some situations. A
local attacker could use this to to expose sensitive information (kernel
memory). (CVE-2017-17864)

Update instructions

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

Ubuntu 17.10

• linux-image-4.13.0-25-lowlatency - 4.13.0-25.29
• linux-image-generic - 4.13.0.25.26
• linux-image-4.13.0-25-generic - 4.13.0-25.29
• linux-image-lowlatency - 4.13.0.25.26

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-2017-16995
• CVE-2017-17862
• CVE-2017-17863
• CVE-2017-17864
• CVE-2017-5754

Related notices

• USN-3523-2: linux-image-4.13.0-26-generic-lpae, linux-image-extra-4.13.0-1005-azure, linux-image-4.13.0-1006-gcp, linux-image-4.13.0-1015-oem, linux-image-extra-4.13.0-1006-gcp, linux-image-4.13.0-26-generic, linux-hwe, linux-image-extra-4.13.0-26-generic, linux-azure, linux-oem, linux-image-4.13.0-26-lowlatency, linux-gcp, linux-image-4.13.0-1005-azure
• USN-3619-2: linux-image-4.4.0-119-lowlatency, linux-image-4.4.0-1016-aws, linux-aws, linux-image-4.4.0-119-generic, linux-image-4.4.0-119-generic-lpae, linux-image-4.4.0-119-powerpc-smp, linux-image-4.4.0-119-powerpc64-smp, linux-image-extra-4.4.0-119-generic, linux-image-4.4.0-119-powerpc-e500mc, linux-lts-xenial, linux-image-4.4.0-119-powerpc64-emb
• USN-3619-1: linux-kvm, linux-image-4.4.0-119-lowlatency, linux-snapdragon, linux-image-4.4.0-1054-aws, linux-image-4.4.0-119-powerpc64-emb, linux-image-4.4.0-1086-raspi2, linux-aws, linux-image-4.4.0-1020-kvm, linux-image-4.4.0-119-generic, linux-image-4.4.0-119-generic-lpae, linux-image-4.4.0-119-powerpc-smp, linux-image-4.4.0-119-powerpc64-smp, linux-image-extra-4.4.0-119-generic, linux-image-4.4.0-119-powerpc-e500mc, linux, linux-raspi2, linux-image-4.4.0-1088-snapdragon
• USN-3633-1: linux-euclid, linux-image-extra-4.4.0-9026-euclid, linux-image-4.4.0-9026-euclid
• USN-3523-3: linux-image-raspi2, linux-image-4.13.0-1011-raspi2, linux-raspi2
• USN-3541-2: linux-image-extra-4.13.0-31-generic, linux-image-4.13.0-1007-gcp, linux-image-4.13.0-1006-azure, linux-image-4.13.0-31-generic-lpae, linux-azure, linux-image-4.13.0-1017-oem, linux-image-4.13.0-31-lowlatency, linux-image-extra-4.13.0-1007-gcp, linux-oem, linux-image-4.13.0-31-generic, linux-gcp, linux-hwe, linux-image-extra-4.13.0-1006-azure
• USN-3540-1: linux-image-4.4.0-112-generic-lpae, linux-image-4.4.0-112-powerpc64-smp, linux-image-4.4.0-112-powerpc64-emb, linux-image-extra-4.4.0-9023-euclid, linux-aws, linux-image-4.4.0-112-powerpc-e500mc, linux-euclid, linux-image-4.4.0-112-powerpc-smp, linux-image-4.4.0-9023-euclid, linux-image-extra-4.4.0-112-generic, linux, linux-image-4.4.0-112-lowlatency, linux-image-4.4.0-112-generic, linux-image-4.4.0-1049-aws
• USN-3540-2: linux-image-4.4.0-1011-aws, linux-image-4.4.0-111-generic, linux-image-4.4.0-111-generic-lpae, linux-aws, linux-image-4.4.0-111-powerpc-e500mc, linux-image-4.4.0-111-lowlatency, linux-image-4.4.0-111-powerpc64-emb, linux-lts-xenial, linux-image-4.4.0-111-powerpc-smp, linux-image-extra-4.4.0-111-generic, linux-image-4.4.0-111-powerpc64-smp
• USN-3522-1: linux-image-4.4.0-108-powerpc-e500mc, linux-kvm, linux-image-extra-4.4.0-108-generic, linux-image-4.4.0-1015-kvm, linux-aws, linux-image-4.4.0-108-powerpc64-emb, linux-image-4.4.0-9021-euclid, linux-euclid, linux-image-4.4.0-108-powerpc64-smp, linux-image-4.4.0-1047-aws, linux, linux-image-4.4.0-108-generic-lpae, linux-image-extra-4.4.0-9021-euclid, linux-image-4.4.0-108-lowlatency, linux-image-4.4.0-108-powerpc-smp, linux-image-4.4.0-108-generic
• USN-3522-2: linux-image-4.4.0-108-powerpc-e500mc, linux-image-extra-4.4.0-108-generic, linux-aws, linux-image-4.4.0-108-powerpc64-emb, linux-image-4.4.0-108-powerpc64-smp, linux-image-4.4.0-1009-aws, linux-image-4.4.0-108-generic-lpae, linux-image-4.4.0-108-lowlatency, linux-image-4.4.0-108-powerpc-smp, linux-lts-xenial, linux-image-4.4.0-108-generic
• USN-3524-2: linux-image-3.13.0-139-generic, linux-image-generic-lpae-lts-trusty, linux-lts-trusty, linux-image-3.13.0-139-generic-lpae, linux-image-generic-lts-trusty
• USN-3524-1: linux-image-3.13.0-139-powerpc-e500mc, linux-image-3.13.0-139-powerpc-e500, linux-image-3.13.0-139-powerpc-smp, linux-image-3.13.0-139-lowlatency, linux-image-3.13.0-139-generic, linux-image-3.13.0-139-powerpc64-smp, linux-image-extra-3.13.0-139-generic, linux, linux-image-3.13.0-139-generic-lpae, linux-image-3.13.0-139-powerpc64-emb
• USN-3597-2: linux-image-4.13.0-37-generic-lpae, linux-image-4.13.0-37-generic, linux-image-4.13.0-37-lowlatency, linux-image-extra-4.13.0-37-generic, linux-hwe
• USN-3516-1: firefox-locale-tr, firefox-locale-ka, firefox-locale-mk, firefox-locale-bs, firefox-locale-sw, firefox-locale-fr, firefox-locale-fy, firefox-locale-hy, firefox-locale-as, firefox-locale-vi, firefox-locale-gd, firefox-locale-el, firefox-locale-de, firefox-locale-bn, firefox-locale-pt, firefox-locale-zu, firefox-locale-uk, firefox-locale-kab, firefox-locale-xh, firefox-locale-ms, firefox-locale-ru, firefox-locale-az, firefox-locale-pa, firefox-locale-uz, firefox-globalmenu, firefox-locale-th, firefox-locale-ca, firefox-locale-sr, firefox-locale-ml, firefox, firefox-locale-be, firefox-locale-km, firefox-locale-it, firefox-locale-or, firefox-locale-an, firefox-locale-eu, firefox-locale-id, firefox-locale-es, firefox-locale-fi, firefox-locale-ku, firefox-locale-bg, firefox-testsuite, firefox-locale-cak, firefox-locale-ast, firefox-locale-is, firefox-locale-en, firefox-locale-ga, firefox-locale-ur, firefox-locale-lg, firefox-locale-hu, firefox-locale-hi, firefox-locale-ta, firefox-locale-te, firefox-locale-kk, firefox-locale-nn, firefox-locale-ko, firefox-locale-csb, firefox-locale-sl, firefox-locale-eo, firefox-locale-et, firefox-locale-hsb, firefox-locale-sq, firefox-locale-sv, firefox-locale-zh-hans, firefox-locale-mr, firefox-mozsymbols, firefox-locale-lv, firefox-locale-zh-hant, firefox-locale-nso, firefox-locale-nb, firefox-locale-pl, firefox-locale-br, firefox-locale-gl, firefox-locale-he, firefox-locale-hr, firefox-locale-ar, firefox-dev, firefox-locale-af, firefox-locale-mai, firefox-locale-my, firefox-locale-gn, firefox-locale-mn, firefox-locale-da, firefox-locale-cy, firefox-locale-kn, firefox-locale-sk, firefox-locale-ja, firefox-locale-nl, firefox-locale-gu, firefox-locale-fa, firefox-locale-lt, firefox-locale-ro, firefox-locale-oc, firefox-locale-si, firefox-locale-cs
• USN-3541-1: linux-image-lowlatency, linux, linux-image-4.13.0-31-lowlatency, linux-image-4.13.0-31-generic, linux-image-generic
• USN-3597-1: linux-image-4.13.0-37-generic-lpae, linux-image-lowlatency, linux-raspi2, linux-image-4.13.0-37-generic, linux, linux-image-4.13.0-37-lowlatency, linux-image-4.13.0-1015-raspi2, linux-image-raspi2, linux-image-generic, linux-image-generic-lpae
• USN-3525-1: linux-image-3.2.0-132-generic, linux-image-3.2.0-132-generic-pae, linux, linux-image-generic-pae, linux-image-generic
• USN-3583-1: linux-image-3.13.0-142-generic-lpae, linux-image-3.13.0-142-generic, linux-image-3.13.0-142-lowlatency, linux-image-3.13.0-142-powerpc-e500, linux-image-3.13.0-142-powerpc64-smp, linux-image-3.13.0-142-powerpc-smp, linux-image-extra-3.13.0-142-generic, linux, linux-image-3.13.0-142-powerpc64-emb, linux-image-3.13.0-142-powerpc-e500mc