========================================================================= Ubuntu Security Notice USN-4527-1 September 22, 2020 linux, linux-aws, linux-lts-xenial, linux-raspi2, linux-snapdragon vulnerabilities ========================================================================= A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 16.04 LTS - Ubuntu 14.04 ESM 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-raspi2: Linux kernel for Raspberry Pi (V8) systems - linux-snapdragon: Linux kernel for Qualcomm Snapdragon processors - linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty Details: It was discovered that the Conexant 23885 TV card device driver for the Linux kernel did not properly deallocate memory in some error conditions. A local attacker could use this to cause a denial of service (memory exhaustion). (CVE-2019-19054) It was discovered that the Atheros HTC based wireless driver in the Linux kernel did not properly deallocate in certain error conditions. A local attacker could use this to cause a denial of service (memory exhaustion). (CVE-2019-19073, CVE-2019-19074) Yue Haibing discovered that the Linux kernel did not properly handle reference counting in sysfs for network devices in some situations. A local attacker could possibly use this to cause a denial of service. (CVE-2019-20811) It was discovered that the F2FS file system in the Linux kernel did not properly perform bounds checking in some situations, leading to an out-of- bounds read. A local attacker could possibly use this to expose sensitive information (kernel memory). (CVE-2019-9445) It was discovered that the F2FS file system in the Linux kernel did not properly validate xattr meta data in some situations, leading to an out-of- bounds read. An attacker could use this to construct a malicious F2FS image that, when mounted, could expose sensitive information (kernel memory). (CVE-2019-9453) It was discovered that the F2FS file system implementation in the Linux kernel did not properly perform bounds checking on xattrs in some situations. A local attacker could possibly use this to expose sensitive information (kernel memory). (CVE-2020-0067) It was discovered that the NFS client implementation in the Linux kernel did not properly perform bounds checking before copying security labels in some situations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2020-25212) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 LTS: linux-image-4.4.0-1114-aws 4.4.0-1114.127 linux-image-4.4.0-1139-raspi2 4.4.0-1139.148 linux-image-4.4.0-1143-snapdragon 4.4.0-1143.152 linux-image-4.4.0-190-generic 4.4.0-190.220 linux-image-4.4.0-190-generic-lpae 4.4.0-190.220 linux-image-4.4.0-190-lowlatency 4.4.0-190.220 linux-image-4.4.0-190-powerpc-e500mc 4.4.0-190.220 linux-image-4.4.0-190-powerpc-smp 4.4.0-190.220 linux-image-4.4.0-190-powerpc64-emb 4.4.0-190.220 linux-image-4.4.0-190-powerpc64-smp 4.4.0-190.220 linux-image-aws 4.4.0.1114.119 linux-image-generic 4.4.0.190.196 linux-image-generic-lpae 4.4.0.190.196 linux-image-lowlatency 4.4.0.190.196 linux-image-powerpc-e500mc 4.4.0.190.196 linux-image-powerpc-smp 4.4.0.190.196 linux-image-powerpc64-emb 4.4.0.190.196 linux-image-powerpc64-smp 4.4.0.190.196 linux-image-raspi2 4.4.0.1139.139 linux-image-snapdragon 4.4.0.1143.135 linux-image-virtual 4.4.0.190.196 Ubuntu 14.04 ESM: linux-image-4.4.0-1078-aws 4.4.0-1078.82 linux-image-4.4.0-190-generic 4.4.0-190.220~14.04.1 linux-image-4.4.0-190-generic-lpae 4.4.0-190.220~14.04.1 linux-image-4.4.0-190-lowlatency 4.4.0-190.220~14.04.1 linux-image-4.4.0-190-powerpc-e500mc 4.4.0-190.220~14.04.1 linux-image-4.4.0-190-powerpc-smp 4.4.0-190.220~14.04.1 linux-image-4.4.0-190-powerpc64-emb 4.4.0-190.220~14.04.1 linux-image-4.4.0-190-powerpc64-smp 4.4.0-190.220~14.04.1 linux-image-aws 4.4.0.1078.75 linux-image-generic-lpae-lts-xenial 4.4.0.190.166 linux-image-generic-lts-xenial 4.4.0.190.166 linux-image-lowlatency-lts-xenial 4.4.0.190.166 linux-image-powerpc-e500mc-lts-xenial 4.4.0.190.166 linux-image-powerpc-smp-lts-xenial 4.4.0.190.166 linux-image-powerpc64-emb-lts-xenial 4.4.0.190.166 linux-image-powerpc64-smp-lts-xenial 4.4.0.190.166 linux-image-virtual-lts-xenial 4.4.0.190.166 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/4527-1 CVE-2019-19054, CVE-2019-19073, CVE-2019-19074, CVE-2019-20811, CVE-2019-9445, CVE-2019-9453, CVE-2020-0067, CVE-2020-25212 Package Information: https://launchpad.net/ubuntu/+source/linux/4.4.0-190.220 https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1114.127 https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1139.148 https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1143.152