========================================================================== Ubuntu Security Notice USN-3208-2 February 22, 2017 linux-lts-xenial vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 14.04 LTS Summary: Several security issues were fixed in the kernel. Software Description: - linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty Details: USN-3208-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu 14.04 LTS. It was discovered that the generic SCSI block layer in the Linux kernel did not properly restrict write operations in certain situations. A local attacker could use this to cause a denial of service (system crash) or possibly gain administrative privileges. (CVE-2016-10088) CAI Qian discovered that the sysctl implementation in the Linux kernel did not properly perform reference counting in some situations. An unprivileged attacker could use this to cause a denial of service (system hang). (CVE-2016-9191) Jim Mattson discovered that the KVM implementation in the Linux kernel mismanages the #BP and #OF exceptions. A local attacker in a guest virtual machine could use this to cause a denial of service (guest OS crash). (CVE-2016-9588) Andy Lutomirski and Willy Tarreau discovered that the KVM implementation in the Linux kernel did not properly emulate instructions on the SS segment register. A local attacker in a guest virtual machine could use this to cause a denial of service (guest OS crash) or possibly gain administrative privileges in the guest OS. (CVE-2017-2583) Dmitry Vyukov discovered that the KVM implementation in the Linux kernel improperly emulated certain instructions. A local attacker could use this to obtain sensitive information (kernel memory). (CVE-2017-2584) It was discovered that the KLSI KL5KUSB105 serial-to-USB device driver in the Linux kernel did not properly initialize memory related to logging. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2017-5549) Andrey Konovalov discovered a use-after-free vulnerability in the DCCP implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly gain administrative privileges. (CVE-2017-6074) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 14.04 LTS: linux-image-4.4.0-64-generic 4.4.0-64.85~14.04.1 linux-image-4.4.0-64-generic-lpae 4.4.0-64.85~14.04.1 linux-image-4.4.0-64-lowlatency 4.4.0-64.85~14.04.1 linux-image-4.4.0-64-powerpc-e500mc 4.4.0-64.85~14.04.1 linux-image-4.4.0-64-powerpc-smp 4.4.0-64.85~14.04.1 linux-image-4.4.0-64-powerpc64-emb 4.4.0-64.85~14.04.1 linux-image-4.4.0-64-powerpc64-smp 4.4.0-64.85~14.04.1 linux-image-generic-lpae-lts-xenial 4.4.0.64.50 linux-image-generic-lts-xenial 4.4.0.64.50 linux-image-lowlatency-lts-xenial 4.4.0.64.50 linux-image-powerpc-e500mc-lts-xenial 4.4.0.64.50 linux-image-powerpc-smp-lts-xenial 4.4.0.64.50 linux-image-powerpc64-emb-lts-xenial 4.4.0.64.50 linux-image-powerpc64-smp-lts-xenial 4.4.0.64.50 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: http://www.ubuntu.com/usn/usn-3208-2 http://www.ubuntu.com/usn/usn-3208-1 CVE-2016-10088, CVE-2016-9191, CVE-2016-9588, CVE-2017-2583, CVE-2017-2584, CVE-2017-5549, CVE-2017-6074 Package Information: https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-64.85~14.04.1 --+JUInw4efm7IfTNU -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBCgAGBQJYrUWwAAoJEC8Jno0AXoH08SwP/1ayFNgcu9Ew2HnSg9GiVwTp upUlHL2KwN57n4S4ywvIjQLNHWkLsjb+p4RxF0VCSxFKLLp0MkPd17oC/zj61LnM kDeNBo4lRxnbNPdTu7N0DUFmH0vJ/Uf7G0jzx3dk1YewfcS5KvglqFs1RGV8kdG9 TkvWZWp1jXUl6LSstnpuqUkWybcd2Bjp9A3l0HYQMe0rA4M8hLjrG9ncg7jpUFjD uTDk9PbzIOKC9YbTsE9wMFXa3CVUNyHrsxwlSTqxAdyBs/bOAmFCC9GV6L8Em0ir rkWu9uhjm5rQsO+6hCDVsw8rPxRyS/wLxr7QLAlZAHKCRIrQC3V5nvaNzFilNCxr R2D2c4SiYd4fPW+eyyGxKuePSgywqaTW1xA1jTfjSK8LDL20KG1dvD4vAcosUNV0 v8FWiM4FPrnY1CGbKy4spxQIQdxBrYd7ViK8yzOzBv3tKYZZmpP9zbWz6O7Cjpd8 ArX8Slt5RaAGSLNEK+s9fTA78Tk3HZjFvmh1/pin29oN45h+aijn7RNt2LUxNWkL MkQxG8kkOlOBfg+kmn8w46t3PushGs9yhHKFUvCsJUPgZPJZO1U5ysQ609K7rAJ7 UVvktEHpD9kYEIwGdXxVim9J6Ja7SYLuzLeUgYoXMFpd9NiBjbQvojpLN5U8kUrj nG8LqtQu1bwotexhaaf0 =jSd+ -----END PGP SIGNATURE----- --+JUInw4efm7IfTNU--