{"id":"USN-5070-1","summary":"linux, linux-aws, linux-aws-5.11, linux-azure, linux-azure-5.11, linux-gcp, linux-hwe-5.11, linux-kvm, linux-oracle, linux-oracle-5.11, linux-raspi vulnerabilities","details":"Maxim Levitsky and Paolo Bonzini discovered that the KVM hypervisor\nimplementation for AMD processors in the Linux kernel allowed a guest VM to\ndisable restrictions on VMLOAD/VMSAVE in a nested guest. An attacker in a\nguest VM could use this to read or write portions of the host's physical\nmemory. (CVE-2021-3656)\n\nMaxim Levitsky discovered that the KVM hypervisor implementation for AMD\nprocessors in the Linux kernel did not properly prevent a guest VM from\nenabling AVIC in nested guest VMs. An attacker in a guest VM could use this\nto write to portions of the host's physical memory. (CVE-2021-3653)\n\nIt was discovered that the Linux kernel did not properly enforce certain\ntypes of entries in the Secure Boot Forbidden Signature Database (aka dbx)\nprotection mechanism. An attacker could use this to bypass UEFI Secure Boot\nrestrictions. (CVE-2020-26541)\n\nIt was discovered that the KVM hypervisor implementation in the Linux\nkernel did not properly perform reference counting in some situations,\nleading to a use-after-free vulnerability. An attacker who could start and\ncontrol a VM could possibly use this to expose sensitive information or\nexecute arbitrary code. (CVE-2021-22543)\n\nNorbert Slusarek discovered that the CAN broadcast manger (bcm) protocol\nimplementation in the Linux kernel did not properly initialize memory in\nsome situations. A local attacker could use this to expose sensitive\ninformation (kernel memory). (CVE-2021-34693)\n\nMurray McAllister discovered that the joystick device interface in the\nLinux kernel did not properly validate data passed via an ioctl(). A local\nattacker could use this to cause a denial of service (system crash) or\npossibly execute arbitrary code on systems with a joystick device\nregistered. (CVE-2021-3612)\n\nIt was discovered that the KVM hypervisor implementation in the Linux\nkernel did not properly compute the access permissions for shadow pages in\nsome situations. A local attacker could use this to cause a denial of\nservice. (CVE-2021-38198)\n\nIt was discovered that the perf subsystem in the Linux kernel for the\nPowerPC architecture contained a null pointer dereference in some\nsituations. An attacker could use this to cause a denial of service (system\ncrash). (CVE-2021-38200)\n\nBen Greear discovered that the mac80211 subsystem in the Linux kernel\ncontained a null pointer dereference in some situations. A physically\nproximate attacker could possibly use this to cause a denial of service\n(system crash). (CVE-2021-38206)\n\nIt was discovered that the Xilinx LL TEMAC device driver in the Linux\nkernel did not properly calculate the number of buffers to be used in\ncertain situations. A remote attacker could use this to cause a denial of\nservice (system crash). (CVE-2021-38207)\n","modified":"2026-05-23T01:48:37.105506221Z","published":"2021-09-08T23:38:43Z","related":["UBUNTU-CVE-2020-26541","UBUNTU-CVE-2021-22543","UBUNTU-CVE-2021-34693","UBUNTU-CVE-2021-3612","UBUNTU-CVE-2021-3653","UBUNTU-CVE-2021-3656","UBUNTU-CVE-2021-38198","UBUNTU-CVE-2021-38200","UBUNTU-CVE-2021-38206","UBUNTU-CVE-2021-38207"],"upstream":["CVE-2021-38200","CVE-2021-38206","UBUNTU-CVE-2021-38200","UBUNTU-CVE-2021-38206"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5070-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-38200"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-38206"}],"affected":[{"package":{"name":"linux-aws-5.11","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/linux-aws-5.11?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.11.0-1017.18~20.04.1"}]}],"versions":["5.11.0-1009.9~20.04.2","5.11.0-1014.15~20.04.1","5.11.0-1016.17~20.04.1"],"ecosystem_specific":{"availability":"No 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