Ubuntu Security Notice 5210-2 - USN-5210-1 fixed vulnerabilities in the Linux kernel. Unfortunately, that update introduced a regression that caused failures to boot in environments with AMD Secure Encrypted Virtualization enabled. This update fixes the problem.
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Ubuntu Security Notice 5210-1 - Nadav Amit discovered that the hugetlb implementation in the Linux kernel did not perform TLB flushes under certain conditions. A local attacker could use this to leak or alter data from other processes that use huge pages. It was discovered that the Linux kernel did not properly enforce certain types of entries in the Secure Boot Forbidden Signature Database protection mechanism. An attacker could use this to bypass UEFI Secure Boot restrictions.
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Ubuntu Security Notice 5120-1 - It was discovered that the f2fs file system in the Linux kernel did not properly validate metadata in some situations. An attacker could use this to construct a malicious f2fs image that, when mounted and operated on, could cause a denial of service or possibly execute arbitrary code. It was discovered that the Linux kernel did not properly enforce certain types of entries in the Secure Boot Forbidden Signature Database protection mechanism. An attacker could use this to bypass UEFI Secure Boot restrictions. Various other issues were also addressed.
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Ubuntu Security Notice 5106-1 - Valentina Palmiotti discovered that the io_uring subsystem in the Linux kernel could be coerced to free adjacent memory. A local attacker could use this to execute arbitrary code. It was discovered that the Linux kernel did not properly enforce certain types of entries in the Secure Boot Forbidden Signature Database protection mechanism. An attacker could use this to bypass UEFI Secure Boot restrictions. Various other issues were also addressed.
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Ubuntu Security Notice 5070-1 - Maxim Levitsky and Paolo Bonzini discovered that the KVM hypervisor implementation for AMD processors in the Linux kernel allowed a guest VM to disable restrictions on VMLOAD/VMSAVE in a nested guest. An attacker in a guest VM could use this to read or write portions of the host's physical memory. Maxim Levitsky discovered that the KVM hypervisor implementation for AMD processors in the Linux kernel did not properly prevent a guest VM from enabling AVIC in nested guest VMs. An attacker in a guest VM could use this to write to portions of the host's physical memory. Various other issues were also addressed.
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Red Hat Security Advisory 2021-2438-01 - Red Hat OpenShift Container Platform is Red Hat's cloud computing Kubernetes application platform solution designed for on-premise or private cloud deployments. Issues addressed include bypass, code execution, denial of service, open redirection, resource exhaustion, and remote shell upload vulnerabilities.
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Red Hat Security Advisory 2021-2718-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Issues addressed include bypass and use-after-free vulnerabilities.
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Red Hat Security Advisory 2021-2719-01 - The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Issues addressed include bypass and use-after-free vulnerabilities.
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Red Hat Security Advisory 2021-2666-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Issues addressed include bypass and use-after-free vulnerabilities.
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Red Hat Security Advisory 2021-2570-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Issues addressed include bypass and use-after-free vulnerabilities.
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Red Hat Security Advisory 2021-2599-01 - The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Issues addressed include bypass and use-after-free vulnerabilities.
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