USN-3619-1: Linux kernel vulnerabilities

4 April 2018

linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities

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

  • Ubuntu 16.04 LTS

Summary

Several security issues were fixed in the Linux kernel.

Software Description

  • 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

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)

It was discovered that a race condition leading to a use-after-free vulnerability existed in the ALSA PCM subsystem of the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-0861)

It was discovered that the KVM implementation in the Linux kernel allowed passthrough of the diagnostic I/O port 0x80. An attacker in a guest VM could use this to cause a denial of service (system crash) in the host OS. (CVE-2017-1000407)

It was discovered that an information disclosure vulnerability existed in the ACPI implementation of the Linux kernel. A local attacker could use this to expose sensitive information (kernel memory addresses). (CVE-2017-11472)

It was discovered that a use-after-free vulnerability existed in the network namespaces 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-2017-15129)

It was discovered that the Advanced Linux Sound Architecture (ALSA) subsystem in the Linux kernel contained a use-after-free when handling device removal. A physically proximate attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-16528)

Andrey Konovalov discovered that the usbtest device driver in the Linux kernel did not properly validate endpoint metadata. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2017-16532)

Andrey Konovalov discovered that the Conexant cx231xx USB video capture driver in the Linux kernel did not properly validate interface descriptors. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2017-16536)

Andrey Konovalov discovered that the SoundGraph iMON USB driver in the Linux kernel did not properly validate device metadata. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2017-16537)

Andrey Konovalov discovered that the IMS Passenger Control Unit USB driver in the Linux kernel did not properly validate device descriptors. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2017-16645)

Andrey Konovalov discovered that the DiBcom DiB0700 USB DVB driver in the Linux kernel did not properly handle detach events. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2017-16646)

Andrey Konovalov discovered that the CDC USB Ethernet driver did not properly validate device descriptors. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2017-16649)

Andrey Konovalov discovered that the QMI WWAN USB driver did not properly validate device descriptors. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2017-16650)

It was discovered that the USB Virtual Host Controller Interface (VHCI) driver in the Linux kernel contained an information disclosure vulnerability. A physically proximate attacker could use this to expose sensitive information (kernel memory). (CVE-2017-16911)

It was discovered that the USB over IP implementation in the Linux kernel did not validate endpoint numbers. A remote attacker could use this to cause a denial of service (system crash). (CVE-2017-16912)

It was discovered that the USB over IP implementation in the Linux kernel did not properly validate CMD_SUBMIT packets. A remote attacker could use this to cause a denial of service (excessive memory consumption). (CVE-2017-16913)

It was discovered that the USB over IP implementation in the Linux kernel contained a NULL pointer dereference error. A remote attacker could use this to cause a denial of service (system crash). (CVE-2017-16914)

It was discovered that the HugeTLB component of the Linux kernel did not properly handle holes in hugetlb ranges. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2017-16994)

It was discovered that the netfilter component of the Linux did not properly restrict access to the connection tracking helpers list. A local attacker could use this to bypass intended access restrictions. (CVE-2017-17448)

It was discovered that the netlink subsystem in the Linux kernel did not properly restrict observations of netlink messages to the appropriate net namespace. A local attacker could use this to expose sensitive information (kernel netlink traffic). (CVE-2017-17449)

It was discovered that the netfilter passive OS fingerprinting (xt_osf) module did not properly perform access control checks. A local attacker could improperly modify the system-wide OS fingerprint list. (CVE-2017-17450)

It was discovered that the core USB subsystem in the Linux kernel did not validate the number of configurations and interfaces in a device. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2017-17558)

Dmitry Vyukov discovered that the KVM implementation in the Linux kernel contained an out-of-bounds read when handling memory-mapped I/O. A local attacker could use this to expose sensitive information. (CVE-2017-17741)

It was discovered that the Salsa20 encryption algorithm implementations in the Linux kernel did not properly handle zero-length inputs. A local attacker could use this to cause a denial of service (system crash). (CVE-2017-17805)

It was discovered that the HMAC implementation did not validate the state of the underlying cryptographic hash algorithm. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-17806)

It was discovered that the keyring implementation in the Linux kernel did not properly check permissions when a key request was performed on a task’s default keyring. A local attacker could use this to add keys to unauthorized keyrings. (CVE-2017-17807)

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)

It was discovered that the parallel cryptography component of the Linux kernel incorrectly freed kernel memory. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-18075)

It was discovered that a race condition existed in the Device Mapper component of the Linux kernel. A local attacker could use this to cause a denial of service (system crash). (CVE-2017-18203)

It was discovered that a race condition existed in the OCFS2 file system implementation in the Linux kernel. A local attacker could use this to cause a denial of service (kernel deadlock). (CVE-2017-18204)

It was discovered that an infinite loop could occur in the the madvise(2) implementation in the Linux kernel in certain circumstances. A local attacker could use this to cause a denial of service (system hang). (CVE-2017-18208)

Andy Lutomirski discovered that the KVM implementation in the Linux kernel was vulnerable to a debug exception error when single-stepping through a syscall. A local attacker in a non-Linux guest vm could possibly use this to gain administrative privileges in the guest vm. (CVE-2017-7518)

It was discovered that the Broadcom NetXtremeII ethernet driver in the Linux kernel did not properly validate Generic Segment Offload (GSO) packet sizes. An attacker could use this to cause a denial of service (interface unavailability). (CVE-2018-1000026)

It was discovered that the Reliable Datagram Socket (RDS) implementation in the Linux kernel contained an out-of-bounds write during RDMA page allocation. An attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2018-5332)

Mohamed Ghannam discovered a null pointer dereference in the RDS (Reliable Datagram Sockets) protocol implementation of the Linux kernel. A local attacker could use this to cause a denial of service (system crash). (CVE-2018-5333)

范龙飞 discovered that a race condition existed in loop block device 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-2018-5344)

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 a NULL pointer dereference existed in the RDS (Reliable Datagram Sockets) protocol implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash). (CVE-2018-7492)

It was discovered that the Broadcom UniMAC MDIO bus controller driver in the Linux kernel did not properly validate device resources. A local attacker could use this to cause a denial of service (system crash). (CVE-2018-8043)

Update instructions

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

Ubuntu 16.04 LTS
linux-image-4.4.0-1020-kvm - 4.4.0-1020.25
linux-image-4.4.0-1054-aws - 4.4.0-1054.63
linux-image-4.4.0-1086-raspi2 - 4.4.0-1086.94
linux-image-4.4.0-1088-snapdragon - 4.4.0-1088.93
linux-image-4.4.0-119-generic - 4.4.0-119.143
linux-image-4.4.0-119-generic-lpae - 4.4.0-119.143
linux-image-4.4.0-119-lowlatency - 4.4.0-119.143
linux-image-4.4.0-119-powerpc-e500mc - 4.4.0-119.143
linux-image-4.4.0-119-powerpc-smp - 4.4.0-119.143
linux-image-4.4.0-119-powerpc64-emb - 4.4.0-119.143
linux-image-4.4.0-119-powerpc64-smp - 4.4.0-119.143
linux-image-aws - 4.4.0.1054.56
linux-image-generic - 4.4.0.119.125
linux-image-generic-lpae - 4.4.0.119.125
linux-image-kvm - 4.4.0.1020.19
linux-image-lowlatency - 4.4.0.119.125
linux-image-powerpc-e500mc - 4.4.0.119.125
linux-image-powerpc-smp - 4.4.0.119.125
linux-image-powerpc64-emb - 4.4.0.119.125
linux-image-powerpc64-smp - 4.4.0.119.125
linux-image-raspi2 - 4.4.0.1086.86
linux-image-snapdragon - 4.4.0.1088.80

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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