USN-3696-1: 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

It was discovered that an integer overflow existed in the perf subsystem of
the Linux kernel. A local attacker could use this to cause a denial of
service (system crash). (CVE-2017-18255)

Wei Fang discovered an integer overflow in the F2FS filesystem
implementation in the Linux kernel. A local attacker could use this to
cause a denial of service. (CVE-2017-18257)

It was discovered that an information leak existed in the generic SCSI
driver in the Linux kernel. A local attacker could use this to expose
sensitive information (kernel memory). (CVE-2018-1000204)

It was discovered that the wait4() system call in the Linux kernel did not
properly validate its arguments in some situations. A local attacker could
possibly use this to cause a denial of service. (CVE-2018-10087)

It was discovered that the kill() system call implementation in the Linux
kernel did not properly validate its arguments in some situations. A local
attacker could possibly use this to cause a denial of service.
(CVE-2018-10124)

Julian Stecklina and Thomas Prescher discovered that FPU register states
(such as MMX, SSE, and AVX registers) which are lazily restored are
potentially vulnerable to a side channel attack. A local attacker could use
this to expose sensitive information. (CVE-2018-3665)

Jakub Jirasek discovered that multiple use-after-free errors existed in the
USB/IP 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-2018-5814)

It was discovered that an information leak vulnerability existed in the
floppy driver in the Linux kernel. A local attacker could use this to
expose sensitive information (kernel memory). (CVE-2018-7755)

Seunghun Han discovered an information leak in the ACPI handling code in
the Linux kernel when handling early termination of ACPI table loading. A
local attacker could use this to expose sensitive informal (kernel address
locations). (CVE-2017-13695)

It was discovered that a memory leak existed in the Serial Attached SCSI
(SAS) implementation in the Linux kernel. A physically proximate attacker
could use this to cause a denial of service (memory exhaustion).
(CVE-2018-10021)

Update instructions

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

Ubuntu 16.04

• linux-image-4.4.0-1029-kvm - 4.4.0-1029.34
• linux-image-4.4.0-1062-aws - 4.4.0-1062.71
• linux-image-4.4.0-1092-raspi2 - 4.4.0-1092.100
• linux-image-4.4.0-1095-snapdragon - 4.4.0-1095.100
• linux-image-4.4.0-130-generic - 4.4.0-130.156
• linux-image-4.4.0-130-generic-lpae - 4.4.0-130.156
• linux-image-4.4.0-130-lowlatency - 4.4.0-130.156
• linux-image-4.4.0-130-powerpc-e500mc - 4.4.0-130.156
• linux-image-4.4.0-130-powerpc-smp - 4.4.0-130.156
• linux-image-4.4.0-130-powerpc64-emb - 4.4.0-130.156
• linux-image-4.4.0-130-powerpc64-smp - 4.4.0-130.156

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-2017-13695
• CVE-2017-18255
• CVE-2017-18257
• CVE-2018-1000204
• CVE-2018-10021
• CVE-2018-10087
• CVE-2018-10124
• CVE-2018-3665
• CVE-2018-5814
• CVE-2018-7755

Related notices

• USN-3762-2: linux-image-unsigned-4.15.0-1023-azure, linux-image-unsigned-4.15.0-1019-gcp, linux-azure, linux-gcp, linux-hwe, linux-image-4.15.0-34-lowlatency, linux-image-unsigned-4.15.0-34-lowlatency, linux-image-unsigned-4.15.0-34-generic, linux-image-4.15.0-34-generic, linux-image-4.15.0-34-generic-lpae
• USN-3762-1: linux-image-unsigned-4.15.0-1023-azure, linux-image-4.15.0-34-snapdragon, linux-image-unsigned-4.15.0-1019-gcp, linux-aws, linux, linux-image-4.15.0-1021-kvm, linux-azure, linux-gcp, linux-raspi2, linux-image-4.15.0-1021-aws, linux-image-4.15.0-34-lowlatency, linux-image-unsigned-4.15.0-34-lowlatency, linux-image-unsigned-4.15.0-34-generic, linux-image-4.15.0-34-generic, linux-kvm, linux-image-4.15.0-34-generic-lpae, linux-image-4.15.0-1022-raspi2
• USN-3696-2: linux-image-4.4.0-130-powerpc64-emb, linux-image-4.4.0-130-lowlatency, linux-image-4.4.0-1024-aws, linux-aws, linux-image-4.4.0-130-powerpc64-smp, linux-lts-xenial, linux-image-4.4.0-130-generic-lpae, linux-image-4.4.0-130-powerpc-e500mc, linux-image-4.4.0-130-powerpc-smp, linux-image-4.4.0-130-generic, linux-image-extra-4.4.0-130-generic
• USN-3754-1: linux-image-3.13.0-157-generic-lpae, linux-image-3.13.0-157-lowlatency, linux-image-3.13.0-157-powerpc-e500mc, linux, linux-image-3.13.0-157-powerpc-smp, linux-image-3.13.0-157-powerpc-e500, linux-image-3.13.0-157-generic, linux-image-3.13.0-157-powerpc64-emb, linux-image-3.13.0-157-powerpc64-smp, linux-image-extra-3.13.0-157-generic
• USN-3752-2: linux-image-unsigned-4.15.0-33-generic, linux-image-4.15.0-33-generic, linux-image-unsigned-4.15.0-33-lowlatency, linux-image-4.15.0-33-generic-lpae, linux-hwe, linux-image-4.15.0-33-lowlatency
• USN-3752-1: linux-image-4.15.0-1021-raspi2, linux-aws, linux-image-4.15.0-33-snapdragon, linux-image-unsigned-4.15.0-33-generic, linux-image-4.15.0-33-lowlatency, linux, linux-image-unsigned-4.15.0-33-lowlatency, linux-gcp, linux-image-4.15.0-33-generic-lpae, linux-image-unsigned-4.15.0-1018-gcp, linux-raspi2, linux-image-4.15.0-1020-kvm, linux-image-4.15.0-33-generic, linux-kvm, linux-image-4.15.0-1020-aws
• USN-3752-3: linux-azure, linux-gcp, linux-oem, linux-image-unsigned-4.15.0-1018-gcp, linux-image-unsigned-4.15.0-1017-oem, linux-image-unsigned-4.15.0-1022-azure
• USN-3678-4: linux-image-4.15.0-1012-raspi2, linux-raspi2
• USN-3678-3: linux-azure, linux-image-unsigned-4.15.0-1013-azure
• USN-3678-1: linux-image-4.15.0-23-snapdragon, linux-aws, linux-image-4.15.0-1010-aws, linux-image-4.15.0-23-generic-lpae, linux-image-4.15.0-1009-gcp, linux, linux-gcp, linux-image-4.15.0-1011-kvm, linux-image-4.15.0-23-lowlatency, linux-kvm, linux-image-unsigned-4.15.0-23-lowlatency, linux-image-unsigned-4.15.0-23-generic, linux-image-4.15.0-23-generic
• USN-3678-2: linux-azure, linux-image-unsigned-4.15.0-1013-azure
• USN-3698-2: linux-image-generic-lts-trusty, linux-image-generic-lpae-lts-trusty, linux-lts-trusty, linux-image-3.13.0-153-generic-lpae, linux-image-3.13.0-153-generic
• USN-3698-1: linux-image-3.13.0-153-lowlatency, linux-image-3.13.0-153-powerpc-smp, linux-image-3.13.0-153-powerpc-e500, linux, linux-image-3.13.0-153-powerpc64-emb, linux-image-extra-3.13.0-153-generic, linux-image-3.13.0-153-powerpc-e500mc, linux-image-3.13.0-153-generic-lpae, linux-image-3.13.0-153-powerpc64-smp, linux-image-3.13.0-153-generic
• USN-3695-2: linux-image-4.15.0-24-lowlatency, linux-image-4.15.0-24-generic, linux-image-unsigned-4.15.0-24-generic, linux-image-4.15.0-24-generic-lpae, linux-image-unsigned-4.15.0-24-lowlatency, linux-azure, linux-hwe, linux-image-unsigned-4.15.0-1014-azure
• USN-3695-1: linux-image-unsigned-4.15.0-24-generic, linux-gcp, linux-raspi2, linux-image-unsigned-4.15.0-1009-oem, linux-image-4.15.0-1011-aws, linux-image-4.15.0-1013-raspi2, linux-image-unsigned-4.15.0-24-lowlatency, linux-image-4.15.0-1012-kvm, linux-kvm, linux-image-4.15.0-24-generic, linux-aws, linux, linux-azure, linux-image-4.15.0-1010-gcp, linux-image-unsigned-4.15.0-1014-azure, linux-image-4.15.0-24-lowlatency, linux-image-4.15.0-24-generic-lpae, linux-oem, linux-image-4.15.0-24-snapdragon
• USN-3697-1: linux-image-4.13.0-46-generic, linux-image-generic-lpae, linux-image-generic, linux-image-4.13.0-1023-raspi2, linux-image-lowlatency, linux, linux-raspi2, linux-image-4.13.0-46-generic-lpae, linux-image-4.13.0-46-lowlatency, linux-image-raspi2
• USN-3697-2: linux-oem, linux-image-4.13.0-1031-oem