USN-3523-3: Linux kernel (Raspberry Pi 2) vulnerabilities

Releases

• Ubuntu 17.10

Packages

• linux-raspi2 - Linux kernel for Raspberry Pi 2

Details

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-4.13.0-1011-raspi2 - 4.13.0-1011.11
• linux-image-raspi2 - 4.13.0.1011.9

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

Related notices

• USN-3523-2: linux-hwe, linux-image-4.13.0-26-generic, linux-image-4.13.0-26-generic-lpae, linux-image-4.13.0-1006-gcp, linux-oem, linux-image-4.13.0-1005-azure, linux-azure, linux-gcp, linux-image-extra-4.13.0-26-generic, linux-image-4.13.0-1015-oem, linux-image-extra-4.13.0-1005-azure, linux-image-4.13.0-26-lowlatency, linux-image-extra-4.13.0-1006-gcp
• USN-3619-2: linux-lts-xenial, linux-image-4.4.0-119-powerpc64-emb, linux-image-4.4.0-119-generic, linux-aws, linux-image-4.4.0-119-generic-lpae, linux-image-4.4.0-119-powerpc64-smp, linux-image-4.4.0-119-powerpc-smp, linux-image-extra-4.4.0-119-generic, linux-image-4.4.0-119-lowlatency, linux-image-4.4.0-1016-aws, linux-image-4.4.0-119-powerpc-e500mc
• USN-3619-1: linux-kvm, linux-image-4.4.0-1054-aws, linux-image-4.4.0-1086-raspi2, linux-image-4.4.0-119-generic, linux-aws, linux, 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-raspi2, linux-image-4.4.0-1020-kvm, linux-image-4.4.0-119-lowlatency, linux-image-4.4.0-119-powerpc64-emb, linux-image-4.4.0-1088-snapdragon, linux-image-4.4.0-119-powerpc-e500mc, linux-snapdragon
• USN-3633-1: linux-euclid, linux-image-4.4.0-9026-euclid, linux-image-extra-4.4.0-9026-euclid
• USN-3523-1: linux-image-4.13.0-25-lowlatency, linux-image-lowlatency, linux, linux-image-generic, linux-image-4.13.0-25-generic