USN-5206-1 linux-oem-5.14 vulnerability

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...

Design/Logic Flaw

Failure to flush the Translation Lookaside Buffer TLB of the I/O memory management unit IOMMU may lead an IO device to write to memory it should not be able to access, resulting in a potential loss of integrity...

SUSE-SU-2020:3742-1 Security update for xen

This update for xen fixes the following issues: - bsc1178963 - stack corruption from XSA-346 change XSA-355 - bsc1177409 - CVE-2020-27674: x86 PV guest INVLPG-like flushes may leave stale TLB entries XSA-286 - bsc1177412 - CVE-2020-27672: Race condition in Xen mapping code XSA-345 - bsc1177413 -...

undue deferral of IOMMU TLB flushes

ISSUE DESCRIPTION To efficiently change the physical to machine address mappings of a larger range of addresses for fully virtualized guests, Xen contains an optimization to coalesce per-page IOMMU TLB flushes into a single, wider flush after all adjustments have been made. While this is fine to ...

kernel: kvm: Information leak within a KVM guest

A flaw was found in the way Linux kernel's KVM hypervisor handled deferred TLB flush requests from guest. A race condition may occur between the guest issuing a deferred TLB flush request to KVM, and then KVM handling and acknowledging it. This may result in invalid address translations from TLB...

DEBIAN-CVE-2020-15565

An issue was discovered in Xen through 4.13.x, allowing x86 Intel HVM guest OS users to cause a host OS denial of service or possibly gain privileges because of insufficient cache write-back under VT-d. When page tables are shared between IOMMU and CPU, changes to them require flushing of both...

LSN-0065-1 Kernel Live Patch Security Notice

Andrew Honig reported a flaw in the way KVM Kernel-based Virtual Machine emulated the IOAPIC. A privileged guest user could exploit this flaw to read host memory or cause a denial of service crash the host. CVE-2013-1798 It was discovered that the KVM implementation in the Linux kernel, when...

USN-4301-1 linux-aws-5.0, linux-gcp, linux-gke-5.0, linux-oracle-5.0, linux-azure vulnerabilities

It was discovered that the KVM implementation in the Linux kernel, when paravirtual TLB flushes are enabled in guests, the hypervisor in some situations could miss deferred TLB flushes or otherwise mishandle them. An attacker in a guest VM could use this to expose sensitive information read memor...

USN-4300-1 linux, linux-aws, linux-gcp, linux-gcp-5.3, linux-gke-5.3, linux-hwe, linux-kvm, linux-oracle, linux-raspi2, linux-raspi2-5.3, linux-azure, linux-azure-5.3 vulnerabilities

It was discovered that the KVM implementation in the Linux kernel, when paravirtual TLB flushes are enabled in guests, the hypervisor in some situations could miss deferred TLB flushes or otherwise mishandle them. An attacker in a guest VM could use this to expose sensitive information read memor...

Moderate: Red Hat Security Advisory: kernel security and bug fix update

An update for kernel is now available for Red Hat Enterprise Linux 7.6 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for...

RHEL 7 : kernel (RHSA-2020:0103)

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2020:0103 advisory. The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fixes: kernel: Use-after-free in blkdrainqueu...

Important: Red Hat Security Advisory: kernel-rt security and bug fix update

An update for kernel-rt is now available for Red Hat Enterprise MRG 2. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerability from t...

RHEL 7 : kernel (RHSA-2020:0036)

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2020:0036 advisory. The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fixes: kernel: Use-after-free in sndpcminfo...

Moderate: Red Hat Security Advisory: kernel security and bug fix update

An update for kernel is now available for Red Hat Enterprise Linux 7.5 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for...

NewStart CGSL CORE 5.04 / MAIN 5.04 : kernel-rt Multiple Vulnerabilities (NS-SA-2019-0183)

The remote NewStart CGSL host, running version CORE 5.04 / MAIN 5.04, has kernel-rt packages installed that are affected by multiple vulnerabilities: - A flaw was found in the way Linux kernel KVM hypervisor before 4.18 emulated instructions such as sgdt/sidt/fxsave/fxrstor. It did not check...

Denial Of Service (DoS)

kernel is vulneralbe to denial of service DoS. The vulnerability exists as TLB flush happens too late on mremap...

PT-2019-4893 · Xen +1 · Xen +1

Name of the Vulnerable Software and Affected Versions: Xen versions prior to 4.12 Description: The issue is related to an incompatibility between Process Context Identifiers PCID and TLB flushes, allowing x86 PV guest OS users to cause a denial of service or gain privileges. This is due to...

Ubuntu 14.04 LTS : Linux kernel vulnerabilities (USN-3880-1)

The remote Ubuntu 14.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-3880-1 advisory. It was discovered that the CIFS client implementation in the Linux kernel did not properly handle setup negotiation during session recovery, leading to a...

Ubuntu 18.04 LTS : Linux kernel regression (USN-3871-2)

The remote Ubuntu 18.04 LTS host has a package installed that is affected by a vulnerability as referenced in the USN-3871-2 advisory. USN-3871-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04 LTS. Unfortunately, that update introduced regressions with docking station displays and...

USN-3871-3: Linux kernel (AWS, GCP, KVM, OEM, Raspberry Pi 2) vulnerabilities

Wen Xu discovered that a use-after-free vulnerability existed in the ext4 filesystem implementation in the Linux kernel. An attacker could use this to construct a malicious ext4 image that, when mounted, could cause a denial of service system crash or possibly execute arbitrary code...