Important: kernel

Issue Overview: A flaw has been found in Xen. An unprivileged guest can cause Denial of Service DoS of the host by sending network packets to the backend, causing the backend to crash. CVE-2023-46838 In the Linux kernel, the following vulnerability has been resolved: uio: Fix use-after-free in...

OESA-2023-1585 kernel security update

The Linux Kernel, the operating system core itself. Security Fixes: A hash collision flaw was found in the IPv6 connection lookup table in the Linux kernel’s IPv6 functionality when a user makes a new kind of SYN flood attack. A user located in the local network or with a high bandwidth connectio...

OESA-2023-1587 kernel security update

The Linux Kernel, the operating system core itself. Security Fixes: A hash collision flaw was found in the IPv6 connection lookup table in the Linux kernel’s IPv6 functionality when a user makes a new kind of SYN flood attack. A user located in the local network or with a high bandwidth connectio...

USN-6013-1 linux-aws vulnerabilities

Xuewei Feng, Chuanpu Fu, Qi Li, Kun Sun, and Ke Xu discovered that the TCP implementation in the Linux kernel did not properly handle IPID assignment. A remote attacker could use this to cause a denial of service connection termination or inject forged data. CVE-2020-36516 Ke Sun, Alyssa Milburn,...

UBUNTU-CVE-2022-23034

A PV guest could DoS Xen while unmapping a grant To address XSA-380, reference counting was introduced for grant mappings for the case where a PV guest would have the IOMMU enabled. PV guests can request two forms of mappings. When both are in use for any individual mapping, unmapping of such a...

MGASA-2021-0588 Updated kernel packages fix security vulnerabilities

This kernel update is based on upstream 5.15.11 and fixes at least the following security issues: netdevsim: Zero-initialize memory for new map's value in function nsimbpfmapalloc CVE-2021-4135. Potentially malicious XEN PV backends can cause guest DoS due to unhardened frontends in the guests,...

USN-4750-1 linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-gke-5.4, linux-gkeop, linux-gkeop-5.4, linux-hwe-5.4, linux-kvm, linux-oracle, linux-oracle-5.4, linux-raspi, linux-raspi-5.4 vulnerabilities

Bodong Zhao discovered a use-after-free in the Sun keyboard driver implementation in the Linux kernel. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. CVE-2020-25669 It was discovered that the jfs file system implementation in the Linux kernel...

Xen DoS using IOMMU faults from PCI-passthrough guest

ISSUE DESCRIPTION A VM that controls a PCIE device directly can cause it to issue DMA requests to invalid addresses. Although these requests are denied by the IOMMU, the hypervisor needs to handle the interrupt and clear the error from the IOMMU, and this can be used to live-lock a CPU and...