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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.1624 USN-4946-1: Linux kernel vulnerabilities 12 May 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Linux kernel Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Increased Privileges -- Existing Account Denial of Service -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2021-30002 CVE-2021-29650 CVE-2021-29265 CVE-2021-29264 CVE-2021-28688 CVE-2021-28660 CVE-2021-28375 CVE-2021-28038 CVE-2021-26931 CVE-2021-26930 CVE-2021-20292 CVE-2020-25639 Reference: ESB-2021.1307 ESB-2021.1299 ESB-2021.1251 ESB-2021.1231 Original Bulletin: https://ubuntu.com/security/notices/USN-4946-1 https://ubuntu.com/security/notices/USN-4945-1 Comment: This bulletin contains two (2) Ubuntu security advisories. - --------------------------BEGIN INCLUDED TEXT-------------------- USN-4946-1: Linux kernel vulnerabilities 11 May 2021 Several security issues were fixed in the Linux kernel. Releases o Ubuntu 18.04 LTS o Ubuntu 16.04 ESM o Ubuntu 14.04 ESM Packages o linux - Linux kernel o linux-aws - Linux kernel for Amazon Web Services (AWS) systems o linux-aws-hwe - Linux kernel for Amazon Web Services (AWS-HWE) systems o linux-azure - Linux kernel for Microsoft Azure Cloud systems o linux-azure-4.15 - Linux kernel for Microsoft Azure Cloud systems o linux-dell300x - Linux kernel for Dell 300x platforms o linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems o linux-gcp-4.15 - Linux kernel for Google Cloud Platform (GCP) systems o linux-hwe - Linux hardware enablement (HWE) kernel o linux-kvm - Linux kernel for cloud environments o linux-oracle - Linux kernel for Oracle Cloud systems o linux-raspi2 - Linux kernel for Raspberry Pi (V8) systems o linux-snapdragon - Linux kernel for Qualcomm Snapdragon processors Details It was discovered that the DRM subsystem in the Linux kernel contained double-free vulnerabilities. A privileged attacker could possibly use this to cause a denial of service (system crash) or possibly execute arbitrary code. ( CVE-2021-20292 ) Olivier Benjamin, Norbert Manthey, Martin Mazein, and Jan H. Schonherr discovered that the Xen paravirtualization backend in the Linux kernel did not properly propagate errors to frontend drivers in some situations. An attacker in a guest VM could possibly use this to cause a denial of service (host domain crash). ( CVE-2021-26930 ) Jan Beulich discovered that multiple Xen backends in the Linux kernel did not properly handle certain error conditions under paravirtualization. An attacker in a guest VM could possibly use this to cause a denial of service (host domain crash). ( CVE-2021-26931 ) Jan Beulich discovered that the Xen netback backend in the Linux kernel did not properly handle certain error conditions under paravirtualization. An attacker in a guest VM could possibly use this to cause a denial of service (host domain crash). ( CVE-2021-28038 ) It was discovered that the Xen paravirtualization backend in the Linux kernel did not properly deallocate memory in some situations. A local attacker could use this to cause a denial of service (memory exhaustion). ( CVE-2021-28688 ) It was discovered that the Freescale Gianfar Ethernet driver for the Linux kernel did not properly handle receive queue overrun when jumbo frames were enabled in some situations. An attacker could use this to cause a denial of service (system crash). ( CVE-2021-29264 ) It was discovered that the USB/IP driver in the Linux kernel contained race conditions during the update of local and shared status. An attacker could use this to cause a denial of service (system crash). ( CVE-2021-29265 ) It was discovered that a race condition existed in the netfilter subsystem of the Linux kernel when replacing tables. A local attacker could use this to cause a denial of service (system crash). ( CVE-2021-29650 ) Arnd Bergmann discovered that the video4linux subsystem in the Linux kernel did not properly deallocate memory in some situations. A local attacker could use this to cause a denial of service (memory exhaustion). ( CVE-2021-30002 ) Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 o linux-image-4.15.0-1099-gcp - 4.15.0-1099.112 o linux-image-4.15.0-1091-kvm - 4.15.0-1091.93 o linux-image-gcp-lts-18.04 - 4.15.0.1099.117 o linux-image-4.15.0-1102-aws - 4.15.0-1102.109 o linux-image-4.15.0-143-generic-lpae - 4.15.0-143.147 o linux-image-oracle-lts-18.04 - 4.15.0.1071.81 o linux-image-virtual - 4.15.0.143.130 o linux-image-4.15.0-143-generic - 4.15.0-143.147 o linux-image-4.15.0-1018-dell300x - 4.15.0-1018.22 o linux-image-snapdragon - 4.15.0.1102.105 o linux-image-4.15.0-143-lowlatency - 4.15.0-143.147 o linux-image-dell300x - 4.15.0.1018.20 o linux-image-4.15.0-1085-raspi2 - 4.15.0-1085.90 o linux-image-aws-lts-18.04 - 4.15.0.1102.105 o linux-image-generic - 4.15.0.143.130 o linux-image-4.15.0-1102-snapdragon - 4.15.0-1102.111 o linux-image-kvm - 4.15.0.1091.87 o linux-image-raspi2 - 4.15.0.1085.82 o linux-image-azure-lts-18.04 - 4.15.0.1114.87 o linux-image-4.15.0-1114-azure - 4.15.0-1114.127 o linux-image-generic-lpae - 4.15.0.143.130 o linux-image-lowlatency - 4.15.0.143.130 o linux-image-4.15.0-1071-oracle - 4.15.0-1071.79 Ubuntu 16.04 o linux-image-4.15.0-1102-aws - 4.15.0-1102.109~16.04.1 Available with UA Infra or UA Desktop o linux-image-virtual-hwe-16.04 - 4.15.0.143.139 Available with UA Infra or UA Desktop o linux-image-4.15.0-1099-gcp - 4.15.0-1099.112~16.04.1 Available with UA Infra or UA Desktop o linux-image-gke - 4.15.0.1099.100 Available with UA Infra or UA Desktop o linux-image-gcp - 4.15.0.1099.100 Available with UA Infra or UA Desktop o linux-image-lowlatency-hwe-16.04 - 4.15.0.143.139 Available with UA Infra or UA Desktop o linux-image-oem - 4.15.0.143.139 Available with UA Infra or UA Desktop o linux-image-generic-hwe-16.04 - 4.15.0.143.139 Available with UA Infra or UA Desktop o linux-image-4.15.0-1071-oracle - 4.15.0-1071.79~16.04.1 Available with UA Infra or UA Desktop o linux-image-4.15.0-143-generic - 4.15.0-143.147~16.04.3 Available with UA Infra or UA Desktop o linux-image-oracle - 4.15.0.1071.59 Available with UA Infra or UA Desktop o linux-image-4.15.0-143-lowlatency - 4.15.0-143.147~16.04.3 Available with UA Infra or UA Desktop o linux-image-aws-hwe - 4.15.0.1102.93 Available with UA Infra or UA Desktop Ubuntu 14.04 o linux-image-4.15.0-1114-azure - 4.15.0-1114.127~14.04.1 Available with UA Infra or UA Desktop o linux-image-azure - 4.15.0.1114.87 Available with UA Infra or UA Desktop 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 o CVE-2021-20292 o CVE-2021-26930 o CVE-2021-29264 o CVE-2021-29265 o CVE-2021-29650 o CVE-2021-28688 o CVE-2021-26931 o CVE-2021-28038 o CVE-2021-30002 Related notices o USN-4948-1 : linux-image-oem-20.04b, linux-oem-5.10, linux-image-5.10.0-1026-oem o USN-4945-1 : linux-gkeop-5.4, linux-image-generic, linux-image-generic-lpae, linux-image-generic-lpae-hwe-18.04, linux-image-oem-osp1, linux-image-oem, linux, linux-kvm, linux-image-5.4.0-1039-kvm, linux-azure-5.4, linux-image-virtual, linux-image-5.4.0-1047-azure, linux-image-5.4.0-1043-gcp, linux-image-5.4.0-1015-gkeop, linux-gke-5.4, linux-oracle-5.4, linux-gkeop, linux-image-azure, linux-aws, linux-image-lowlatency, linux-image-oracle, linux-image-gcp, linux-gcp, linux-gcp-5.4, linux-image-gke-5.4, linux-image-gkeop-5.4, linux-image-5.4.0-73-generic, linux-image-5.4.0-73-generic-lpae, linux-image-gke, linux-image-snapdragon-hwe-18.04, linux-image-generic-hwe-18.04, linux-image-kvm, linux-azure, linux-image-virtual-hwe-18.04, linux-oracle, linux-gke, linux-image-5.4.0-1043-gke, linux-image-5.4.0-1048-aws, linux-image-5.4.0-1044-oracle, linux-image-aws, linux-hwe-5.4, linux-image-5.4.0-1045-oracle, linux-image-5.4.0-73-lowlatency, linux-image-gkeop, linux-image-lowlatency-hwe-18.04, linux-aws-5.4 o USN-4911-1 : linux-image-5.10.0-1021-oem, linux-oem-5.10, linux-image-oem-20.04b o USN-4949-1 : linux-image-generic, linux-image-generic-lpae, linux-image-raspi-nolpae, linux, linux-kvm, linux-image-virtual, linux-image-raspi, linux-image-generic-lpae-hwe-20.04, linux-image-5.8.0-1032-azure, linux-image-azure, linux-raspi, linux-aws, linux-image-lowlatency, linux-image-oracle, linux-image-gcp, linux-image-5.8.0-1024-raspi-nolpae, linux-image-5.8.0-1029-oracle, linux-image-5.8.0-1031-gcp, linux-image-5.8.0-53-generic, linux-gcp, linux-image-generic-64k-hwe-20.04, linux-image-oem-20.04, linux-image-gke, linux-image-virtual-hwe-20.04, linux-image-lowlatency-hwe-20.04, linux-image-5.8.0-1027-kvm, linux-image-kvm, linux-azure, linux-image-5.8.0-53-generic-lpae, linux-image-5.8.0-1024-raspi, linux-hwe-5.8, linux-oracle, linux-image-5.8.0-53-lowlatency, linux-image-generic-hwe-20.04, linux-image-aws, linux-image-generic-64k, linux-image-5.8.0-53-generic-64k, linux-image-5.8.0-1033-aws o USN-4909-1 : linux-gkeop-5.4, linux-image-generic, linux-image-generic-lpae, linux-image-generic-lpae-hwe-18.04, linux-image-oem-osp1, linux-image-5.4.0-1044-azure, linux-image-oem, linux, linux-kvm, linux-azure-5.4, linux-image-virtual, linux-image-raspi, linux-image-5.4.0-71-generic, linux-gke-5.4, linux-oracle-5.4, linux-gkeop, linux-image-azure, linux-aws, linux-image-lowlatency, linux-image-oracle, linux-image-gcp, linux-raspi, linux-gcp, linux-gcp-5.4, linux-image-gke-5.4, linux-image-gkeop-5.4, linux-image-5.4.0-1037-kvm, linux-image-5.4.0-1040-gke, linux-image-5.4.0-1042-oracle, linux-image-5.4.0-71-lowlatency, linux-image-raspi2, linux-image-snapdragon-hwe-18.04, linux-image-5.4.0-1033-raspi, linux-image-generic-hwe-18.04, linux-image-gkeop, linux-image-kvm, linux-image-raspi-hwe-18.04, linux-azure, linux-image-virtual-hwe-18.04, linux-oracle, linux-image-5.4.0-71-generic-lpae, linux-raspi-5.4, linux-image-5.4.0-1041-gcp, linux-image-aws, linux-hwe-5.4, linux-image-5.4.0-1043-aws, linux-image-lowlatency-hwe-18.04, linux-aws-5.4, linux-image-5.4.0-1013-gkeop o USN-4947-1 : linux-image-oem-20.04, linux-oem-5.6, linux-image-5.6.0-1056-oem o USN-4904-1 : linux-image-generic, linux-image-generic-lpae, linux-image-4.4.0-208-powerpc64-smp, linux, linux-image-4.4.0-1090-aws, linux-kvm, linux-image-4.4.0-208-powerpc-e500mc, linux-image-virtual, linux-image-4.4.0-1126-aws, linux-image-4.4.0-208-powerpc64-emb, linux-image-powerpc-e500mc, linux-raspi2, linux-image-4.4.0-208-powerpc-smp, linux-image-generic-lts-xenial, linux-aws, linux-image-lowlatency, linux-image-4.4.0-1154-snapdragon, linux-image-powerpc-smp, linux-image-snapdragon, linux-image-lowlatency-lts-xenial, linux-image-powerpc64-emb, linux-image-raspi2, linux-image-kvm, linux-image-4.4.0-208-lowlatency, linux-image-4.4.0-1091-kvm, linux-image-virtual-lts-xenial, linux-lts-xenial, linux-image-4.4.0-208-generic-lpae, linux-image-generic-lpae-lts-xenial, linux-image-aws, linux-image-powerpc64-smp, linux-snapdragon, linux-image-4.4.0-1150-raspi2, linux-image-4.4.0-208-generic - ------------------------------------------------------------------------------------------ USN-4945-1: Linux kernel vulnerabilities 11 May 2021 Several security issues were fixed in the Linux kernel. Releases o Ubuntu 20.04 LTS o Ubuntu 18.04 LTS Packages o linux - Linux kernel o linux-aws - Linux kernel for Amazon Web Services (AWS) systems o linux-aws-5.4 - Linux kernel for Amazon Web Services (AWS) systems o linux-azure - Linux kernel for Microsoft Azure Cloud systems o linux-azure-5.4 - Linux kernel for Microsoft Azure cloud systems o linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems o linux-gcp-5.4 - Linux kernel for Google Cloud Platform (GCP) systems o linux-gke - Linux kernel for Google Container Engine (GKE) systems o linux-gke-5.4 - Linux kernel for Google Container Engine (GKE) systems o linux-gkeop - Linux kernel for Google Container Engine (GKE) systems o linux-gkeop-5.4 - Linux kernel for Google Container Engine (GKE) systems o linux-hwe-5.4 - Linux hardware enablement (HWE) kernel o linux-kvm - Linux kernel for cloud environments o linux-oracle - Linux kernel for Oracle Cloud systems o linux-oracle-5.4 - Linux kernel for Oracle Cloud systems Details It was discovered that the Nouveau GPU driver in the Linux kernel did not properly handle error conditions in some situations. A local attacker could use this to cause a denial of service (system crash). ( CVE-2020-25639 ) Jan Beulich discovered that the Xen netback backend in the Linux kernel did not properly handle certain error conditions under paravirtualization. An attacker in a guest VM could possibly use this to cause a denial of service (host domain crash). ( CVE-2021-28038 ) It was discovered that the fastrpc driver in the Linux kernel did not prevent user space applications from sending kernel RPC messages. A local attacker could possibly use this to gain elevated privileges. ( CVE-2021-28375 ) It was discovered that the Realtek RTL8188EU Wireless device driver in the Linux kernel did not properly validate ssid lengths in some situations. An attacker could use this to cause a denial of service (system crash). ( CVE-2021-28660 ) It was discovered that the USB/IP driver in the Linux kernel contained race conditions during the update of local and shared status. An attacker could use this to cause a denial of service (system crash). ( CVE-2021-29265 ) It was discovered that a race condition existed in the netfilter subsystem of the Linux kernel when replacing tables. A local attacker could use this to cause a denial of service (system crash). ( CVE-2021-29650 ) Arnd Bergmann discovered that the video4linux subsystem in the Linux kernel did not properly deallocate memory in some situations. A local attacker could use this to cause a denial of service (memory exhaustion). ( CVE-2021-30002 ) Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 o linux-image-gkeop-5.4 - 5.4.0.1015.18 o linux-image-5.4.0-1015-gkeop - 5.4.0-1015.16 o linux-image-5.4.0-1045-oracle - 5.4.0-1045.49+1 o linux-image-oem-osp1 - 5.4.0.73.76 o linux-image-oracle - 5.4.0.1045.44 o linux-image-azure - 5.4.0.1047.45 o linux-image-5.4.0-1043-gcp - 5.4.0-1043.46 o linux-image-5.4.0-73-lowlatency - 5.4.0-73.82 o linux-image-gkeop - 5.4.0.1015.18 o linux-image-virtual - 5.4.0.73.76 o linux-image-5.4.0-73-generic-lpae - 5.4.0-73.82 o linux-image-5.4.0-73-generic - 5.4.0-73.82 o linux-image-gke - 5.4.0.1043.52 o linux-image-generic - 5.4.0.73.76 o linux-image-5.4.0-1047-azure - 5.4.0-1047.49 o linux-image-gke-5.4 - 5.4.0.1043.52 o linux-image-oem - 5.4.0.73.76 o linux-image-5.4.0-1048-aws - 5.4.0-1048.50 o linux-image-aws - 5.4.0.1048.49 o linux-image-kvm - 5.4.0.1039.37 o linux-image-5.4.0-1043-gke - 5.4.0-1043.45 o linux-image-generic-lpae - 5.4.0.73.76 o linux-image-gcp - 5.4.0.1043.52 o linux-image-5.4.0-1039-kvm - 5.4.0-1039.40 o linux-image-lowlatency - 5.4.0.73.76 Ubuntu 18.04 o linux-image-gkeop-5.4 - 5.4.0.1015.16~18.04.16 o linux-image-5.4.0-1015-gkeop - 5.4.0-1015.16~18.04.1 o linux-image-oem-osp1 - 5.4.0.73.82~18.04.66 o linux-image-oracle - 5.4.0.1044.47~18.04.26 o linux-image-generic-hwe-18.04 - 5.4.0.73.82~18.04.66 o linux-image-azure - 5.4.0.1047.26 o linux-image-5.4.0-1043-gcp - 5.4.0-1043.46~18.04.1 o linux-image-snapdragon-hwe-18.04 - 5.4.0.73.82~18.04.66 o linux-image-5.4.0-73-lowlatency - 5.4.0-73.82~18.04.1 o linux-image-generic-lpae-hwe-18.04 - 5.4.0.73.82~18.04.66 o linux-image-5.4.0-73-generic-lpae - 5.4.0-73.82~18.04.1 o linux-image-5.4.0-1044-oracle - 5.4.0-1044.47~18.04.1 o linux-image-5.4.0-73-generic - 5.4.0-73.82~18.04.1 o linux-image-lowlatency-hwe-18.04 - 5.4.0.73.82~18.04.66 o linux-image-virtual-hwe-18.04 - 5.4.0.73.82~18.04.66 o linux-image-5.4.0-1047-azure - 5.4.0-1047.49~18.04.1 o linux-image-gke-5.4 - 5.4.0.1043.45~18.04.9 o linux-image-5.4.0-1043-gke - 5.4.0-1043.45~18.04.1 o linux-image-5.4.0-1048-aws - 5.4.0-1048.50~18.04.1 o linux-image-aws - 5.4.0.1048.30 o linux-image-oem - 5.4.0.73.82~18.04.66 o linux-image-gcp - 5.4.0.1043.30 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 o CVE-2021-29265 o CVE-2021-28660 o CVE-2021-28375 o CVE-2021-30002 o CVE-2020-25639 o CVE-2021-28038 o CVE-2021-29650 Related notices o USN-4948-1 : linux-image-oem-20.04b, linux-oem-5.10, linux-image-5.10.0-1026-oem o USN-4911-1 : linux-image-5.10.0-1021-oem, linux-oem-5.10, linux-image-oem-20.04b o USN-4949-1 : linux-image-generic, linux-image-generic-lpae, linux-image-raspi-nolpae, linux, linux-kvm, linux-image-virtual, linux-image-raspi, linux-image-generic-lpae-hwe-20.04, linux-image-5.8.0-1032-azure, linux-image-azure, linux-raspi, linux-aws, linux-image-lowlatency, linux-image-oracle, linux-image-gcp, linux-image-5.8.0-1024-raspi-nolpae, linux-image-5.8.0-1029-oracle, linux-image-5.8.0-1031-gcp, linux-image-5.8.0-53-generic, linux-gcp, linux-image-generic-64k-hwe-20.04, linux-image-oem-20.04, linux-image-gke, linux-image-virtual-hwe-20.04, linux-image-lowlatency-hwe-20.04, linux-image-5.8.0-1027-kvm, linux-image-kvm, linux-azure, linux-image-5.8.0-53-generic-lpae, linux-image-5.8.0-1024-raspi, linux-hwe-5.8, linux-oracle, linux-image-5.8.0-53-lowlatency, linux-image-generic-hwe-20.04, linux-image-aws, linux-image-generic-64k, linux-image-5.8.0-53-generic-64k, linux-image-5.8.0-1033-aws o USN-4946-1 : linux-image-aws-hwe, linux-image-generic, linux-image-generic-lpae, linux-image-oem, linux-image-4.15.0-1114-azure, linux, linux-image-4.15.0-1102-snapdragon, linux-image-4.15.0-143-lowlatency, linux-kvm, linux-hwe, linux-image-dell300x, linux-image-virtual, linux-raspi2, linux-image-4.15.0-143-generic-lpae, linux-image-4.15.0-1102-aws, linux-dell300x, linux-gcp-4.15, linux-image-oracle-lts-18.04, linux-image-4.15.0-1071-oracle, linux-image-azure, linux-aws, linux-image-aws-lts-18.04, linux-image-lowlatency, linux-image-gcp, linux-image-4.15.0-1099-gcp, linux-image-oracle, linux-image-virtual-hwe-16.04, linux-gcp, linux-image-snapdragon, linux-image-4.15.0-1085-raspi2, linux-aws-hwe, linux-image-gke, linux-image-gcp-lts-18.04, linux-image-raspi2, linux-image-lowlatency-hwe-16.04, linux-image-kvm, linux-azure, linux-oracle, linux-image-4.15.0-1018-dell300x, linux-image-azure-lts-18.04, linux-image-generic-hwe-16.04, linux-image-4.15.0-143-generic, linux-image-4.15.0-1091-kvm, linux-snapdragon, linux-azure-4.15 o USN-4947-1 : linux-image-oem-20.04, linux-oem-5.6, linux-image-5.6.0-1056-oem o USN-4904-1 : linux-image-generic, linux-image-generic-lpae, linux-image-4.4.0-208-powerpc64-smp, linux, linux-image-4.4.0-1090-aws, linux-kvm, linux-image-4.4.0-208-powerpc-e500mc, linux-image-virtual, linux-image-4.4.0-1126-aws, linux-image-4.4.0-208-powerpc64-emb, linux-image-powerpc-e500mc, linux-raspi2, linux-image-4.4.0-208-powerpc-smp, linux-image-generic-lts-xenial, linux-aws, linux-image-lowlatency, linux-image-4.4.0-1154-snapdragon, linux-image-powerpc-smp, linux-image-snapdragon, linux-image-lowlatency-lts-xenial, linux-image-powerpc64-emb, linux-image-raspi2, linux-image-kvm, linux-image-4.4.0-208-lowlatency, linux-image-4.4.0-1091-kvm, linux-image-virtual-lts-xenial, linux-lts-xenial, linux-image-4.4.0-208-generic-lpae, linux-image-generic-lpae-lts-xenial, linux-image-aws, linux-image-powerpc64-smp, linux-snapdragon, linux-image-4.4.0-1150-raspi2, linux-image-4.4.0-208-generic - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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