4.9 - USN-3697-1

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 17.10

Summary:

Several security issues were fixed in the Linux kernel.

Software Description: - linux: Linux kernel - linux-raspi2: Linux kernel for Raspberry Pi 2

Details:

It was discovered that a null pointer dereference vulnerability existed in the DCCP protocol implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash). (CVE-2018-1130)

Jann Horn discovered that the 32 bit adjtimex() syscall implementation for 64 bit Linux kernels did not properly initialize memory returned to user space in some situations. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2018-11508)

Wang Qize discovered that an information disclosure vulnerability existed in the SMBus driver for ACPI Embedded Controllers in the Linux kernel. A local attacker could use this to expose sensitive information (kernel pointer addresses). (CVE-2018-5750)

It was discovered that the SCTP Protocol implementation in the Linux kernel did not properly validate userspace provided payload lengths in some situations. A local attacker could use this to cause a denial of service (system crash). (CVE-2018-5803)

It was discovered that an integer overflow error existed in the futex implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash). (CVE-2018-6927)

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)

It was discovered that a memory leak existed in the SAS driver subsystem of the Linux kernel. A local attacker could use this to cause a denial of service (memory exhaustion). (CVE-2018-7757)

Update instructions:

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

Ubuntu 17.10:
linux-image-4.13.0-1023-raspi2 4.13.0-1023.24
linux-image-4.13.0-46-generic 4.13.0-46.51
linux-image-4.13.0-46-generic-lpae 4.13.0-46.51
linux-image-4.13.0-46-lowlatency 4.13.0-46.51
linux-image-generic 4.13.0.46.49
linux-image-generic-lpae 4.13.0.46.49
linux-image-lowlatency 4.13.0.46.49
linux-image-raspi2 4.13.0.1023.21

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:
https://usn.ubuntu.com/usn/usn-3697-1
CVE-2018-1130, CVE-2018-11508, CVE-2018-5750, CVE-2018-5803,
CVE-2018-6927, CVE-2018-7755, CVE-2018-7757

Package Information:
https://launchpad.net/ubuntu/+source/linux/4.13.0-46.51
https://launchpad.net/ubuntu/+source/linux-raspi2/4.13.0-1023.24