ID

VAR-202105-1451

CVE

CVE-2021-22543

TITLE

KVM Buffer error vulnerability

DESCRIPTION

An issue was discovered in Linux: KVM through Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks and can lead to pages being freed while still accessible by the VMM and guest. This allows users with the ability to start and control a VM to read/write random pages of memory and can result in local privilege escalation. Arch Linux is an application system of Arch open source. A lightweight and flexible Linux® distribution that tries to keep it simple. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ==================================================================== Red Hat Security Advisory Synopsis: Important: kernel security update Advisory ID: RHSA-2021:3767-02 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2021:3767 Issue date: 2021-09-24 Updated on: 2021-10-12 CVE Names: CVE-2021-3653 CVE-2021-22543 ==================================================================== 1. Summary: An update for kernel is now available for Red Hat Enterprise Linux 7.2 Advanced Update Support. 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 the CVE link(s) in the References section. 2. Relevant releases/architectures: Red Hat Enterprise Linux Server AUS (v. 7.2) - noarch, x86_64 Red Hat Enterprise Linux Server Optional AUS (v. 7.2) - x86_64 3. 4. Solution: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. 5. Package List: Red Hat Enterprise Linux Server AUS (v. 7.2): Source: kernel-3.10.0-327.101.1.el7.src.rpm noarch: kernel-abi-whitelists-3.10.0-327.101.1.el7.noarch.rpm kernel-doc-3.10.0-327.101.1.el7.noarch.rpm x86_64: kernel-3.10.0-327.101.1.el7.x86_64.rpm kernel-debug-3.10.0-327.101.1.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-327.101.1.el7.x86_64.rpm kernel-debug-devel-3.10.0-327.101.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.101.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.101.1.el7.x86_64.rpm kernel-devel-3.10.0-327.101.1.el7.x86_64.rpm kernel-headers-3.10.0-327.101.1.el7.x86_64.rpm kernel-tools-3.10.0-327.101.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.101.1.el7.x86_64.rpm kernel-tools-libs-3.10.0-327.101.1.el7.x86_64.rpm perf-3.10.0-327.101.1.el7.x86_64.rpm perf-debuginfo-3.10.0-327.101.1.el7.x86_64.rpm python-perf-3.10.0-327.101.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.101.1.el7.x86_64.rpm Red Hat Enterprise Linux Server Optional AUS (v. 7.2): x86_64: kernel-debug-debuginfo-3.10.0-327.101.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.101.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.101.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.101.1.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-327.101.1.el7.x86_64.rpm perf-debuginfo-3.10.0-327.101.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.101.1.el7.x86_64.rpm These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/ 7. Contact: The Red Hat security contact is <secalert@redhat.com>. More contact details at https://access.redhat.com/security/team/contact/ Copyright 2021 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIVAwUBYWVOVtzjgjWX9erEAQjONBAAnfzr1Vls0xtLeZFAGG2hOHsqpStdxijU dJwapHxnnx2e6fwdVjJH4JNmA5OT8RKWTiDUZQTZw2b9BoEy8gTog0IcF/pOMxmn 8IL9EA8syCpj+133FM1NZ92YouoFyl3xVVI5ZDPRblYM7/zyYYCg2WC0VOMrxuNe 8JSQguaKeN4DtH3K63/myrA+iVp4jMactEigsDasDp0pyqvl85O4nt5LksX4YxnZ 5YI7p0QRNfli7Gown/NqIv5v4C4YOEUefRdwSsuYgxvi1+X3k2I7ZSEr4gEIhMCl lQiijcEwglT+2T89cEz0Y/4EvyY1rbO3FPiRX/IA8VpKmk9RtuIy+CLcK3jlKDIK sL+0f88bSyWACHigoCFOeWMFv5t1kVgRTcfJDXjyedNjuzzQ+ZstbIW11zSkXFY9 qZyZPePUAxHtYB7zS8MIWfmuvJkzIG8vCXYqpWYfg0z0IRgrPEhbsEaZZfMaJAz+ qNXUzAeDUt0gc4IR9duR2h8ML9CVTbxtgw19wA8+uqUWoFRNAEj1DDvkVhTN3Sqb 5E3HNqW68fD0JcUNmJgcJBn4WcWA7rulfy2ZZXAIw84TNJ5VDh1cp8f9mEekuols MCl0O5hsWZhXe30Zb92W9O2Tj6GfwEplr6eAcdDL/HGJThNHQVbVlu2GOsxhFGtB ftG+hLpOrus=tfXY -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://listman.redhat.com/mailman/listinfo/rhsa-announce . 7) - ppc64le, x86_64 3. Description: This is a kernel live patch module which is automatically loaded by the RPM post-install script to modify the code of a running kernel. Solution: Before applying this update, make sure all previously released errata relevant to your system have been applied. 6 ELS) - i386, s390x, x86_64 3. Description: Red Hat Advanced Cluster Management for Kubernetes 2.3.2 images Red Hat Advanced Cluster Management for Kubernetes provides the capabilities to address common challenges that administrators and site reliability engineers face as they work across a range of public and private cloud environments. Clusters and applications are all visible and managed from a single console—with security policy built in. See the following Release Notes documentation, which will be updated shortly for this release, for additional details about this release: https://access.redhat.com/documentation/en-us/red_hat_advanced_cluster_mana gement_for_kubernetes/2.3/html/release_notes/ Security: * nodejs-kind-of: ctorName in index.js allows external user input to overwrite certain internal attributes (CVE-2019-20149) Bugs: * RHACM 2.3.2 images (BZ# 1991623) 3. Bugs fixed (https://bugzilla.redhat.com/): 1959721 - CVE-2019-20149 nodejs-kind-of: ctorName in index.js allows external user input to overwrite certain internal attributes 1991623 - RHACM 2.3.2 images 5. Description: OpenShift Virtualization is Red Hat's virtualization solution designed for Red Hat OpenShift Container Platform. This advisory contains the following OpenShift Virtualization 4.8.2 images: RHEL-8-CNV-4.8 ============== kubevirt-vmware-container-v4.8.2-1 node-maintenance-operator-container-v4.8.2-1 bridge-marker-container-v4.8.2-1 kubemacpool-container-v4.8.2-1 virtio-win-container-v4.8.2-1 kubevirt-v2v-conversion-container-v4.8.2-1 hostpath-provisioner-container-v4.8.2-1 kubernetes-nmstate-handler-container-v4.8.2-1 cluster-network-addons-operator-container-v4.8.2-1 cnv-containernetworking-plugins-container-v4.8.2-1 hyperconverged-cluster-operator-container-v4.8.2-2 hostpath-provisioner-operator-container-v4.8.2-1 ovs-cni-marker-container-v4.8.2-1 hyperconverged-cluster-webhook-container-v4.8.2-2 ovs-cni-plugin-container-v4.8.2-1 kubevirt-template-validator-container-v4.8.2-2 kubevirt-ssp-operator-container-v4.8.2-2 cnv-must-gather-container-v4.8.2-3 vm-import-virtv2v-container-v4.8.2-4 vm-import-operator-container-v4.8.2-4 vm-import-controller-container-v4.8.2-4 virt-cdi-cloner-container-v4.8.2-2 virt-cdi-controller-container-v4.8.2-2 virt-cdi-operator-container-v4.8.2-2 virt-cdi-uploadproxy-container-v4.8.2-2 virt-cdi-uploadserver-container-v4.8.2-2 virt-cdi-apiserver-container-v4.8.2-2 virt-cdi-importer-container-v4.8.2-2 virt-launcher-container-v4.8.2-5 virt-api-container-v4.8.2-5 virt-handler-container-v4.8.2-5 virt-controller-container-v4.8.2-5 virt-operator-container-v4.8.2-5 hco-bundle-registry-container-v4.8.2-17 Security Fix(es): * golang: net: lookup functions may return invalid host names (CVE-2021-33195) * golang: net/http/httputil: ReverseProxy forwards connection headers if first one is empty (CVE-2021-33197) * golang: math/big.Rat: may cause a panic or an unrecoverable fatal error if passed inputs with very large exponents (CVE-2021-33198) * golang: crypto/tls: certificate of wrong type is causing TLS client to panic (CVE-2021-34558) 3. Bugs fixed (https://bugzilla.redhat.com/): 1953485 - [CNV-2.5] Manifests in openshift-cnv missing resource requirements - SSP 1957791 - [MTV][Warm] The migrated VM on target side should be powered off/on accordingly to the source VM's last power state during warm migration 1972819 - Failed, Pending and Scheduling VMs can not be stopped 1982143 - [RFE] volumeSnapshotStatuses reason does not check for volume type that do not support snapshots 1983596 - CVE-2021-34558 golang: crypto/tls: certificate of wrong type is causing TLS client to panic 1989564 - CVE-2021-33195 golang: net: lookup functions may return invalid host names 1989570 - CVE-2021-33197 golang: net/http/httputil: ReverseProxy forwards connection headers if first one is empty 1989575 - CVE-2021-33198 golang: math/big.Rat: may cause a panic or an unrecoverable fatal error if passed inputs with very large exponents 1990065 - [4.8.2][network] CNV Daemonsets have maxUnavailable set to 1 which leads to very slow upgrades on large clusters 1991460 - Cannot get 'write' permission without 'resize': Image size is not a multiple of request alignment' 1993122 - Rhel9 templates - provider-url should be updated to https://www.redhat.com/ 1995050 - RHEL9 template - support level and description should be updated 1996110 - cdi importer fails for a CirrOS VM import to NFS (but not to Cepf-rbd/block) 1996660 - [4.8] Goroutine count and memory remains high after VMIs are removed 1997668 - [v2v] VM import from RHV should not be blocked for a non UTC Timezone. 1998818 - virt-handler Pod is missing xorrisofs command 1998983 - 4.8.2 containers 2000021 - [VMIO][RHV VM Import] 63 long char VM Name with more than 1 Disk results in DataVolumeCreationFailed 2001038 - Importer attempts to shrink an image in certain situations 2001069 - [4.8.z] Automatic size detection may not request a PVC that is large enough for an import 5. ========================================================================== Ubuntu Security Notice USN-5070-1 September 08, 2021 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 ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 21.04 - Ubuntu 20.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux: Linux kernel - linux-aws: Linux kernel for Amazon Web Services (AWS) systems - linux-azure: Linux kernel for Microsoft Azure Cloud systems - linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems - linux-kvm: Linux kernel for cloud environments - linux-oracle: Linux kernel for Oracle Cloud systems - linux-raspi: Linux kernel for Raspberry Pi (V8) systems - linux-aws-5.11: Linux kernel for Amazon Web Services (AWS) systems - linux-azure-5.11: Linux kernel for Microsoft Azure cloud systems - linux-hwe-5.11: Linux hardware enablement (HWE) kernel - linux-oracle-5.11: Linux kernel for Oracle Cloud systems Details: 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. (CVE-2021-3656) 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. (CVE-2021-3653) It was discovered that the Linux kernel did not properly enforce certain types of entries in the Secure Boot Forbidden Signature Database (aka dbx) protection mechanism. An attacker could use this to bypass UEFI Secure Boot restrictions. (CVE-2020-26541) It was discovered that the KVM hypervisor implementation in the Linux kernel did not properly perform reference counting in some situations, leading to a use-after-free vulnerability. An attacker who could start and control a VM could possibly use this to expose sensitive information or execute arbitrary code. (CVE-2021-22543) Norbert Slusarek discovered that the CAN broadcast manger (bcm) protocol implementation in the Linux kernel did not properly initialize memory in some situations. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2021-34693) Murray McAllister discovered that the joystick device interface in the Linux kernel did not properly validate data passed via an ioctl(). A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code on systems with a joystick device registered. (CVE-2021-3612) It was discovered that the KVM hypervisor implementation in the Linux kernel did not properly compute the access permissions for shadow pages in some situations. A local attacker could use this to cause a denial of service. (CVE-2021-38198) It was discovered that the perf subsystem in the Linux kernel for the PowerPC architecture contained a null pointer dereference in some situations. An attacker could use this to cause a denial of service (system crash). (CVE-2021-38200) Ben Greear discovered that the mac80211 subsystem in the Linux kernel contained a null pointer dereference in some situations. A physically proximate attacker could possibly use this to cause a denial of service (system crash). (CVE-2021-38206) It was discovered that the Xilinx LL TEMAC device driver in the Linux kernel did not properly calculate the number of buffers to be used in certain situations. A remote attacker could use this to cause a denial of service (system crash). (CVE-2021-38207) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 21.04: linux-image-5.11.0-1015-azure 5.11.0-1015.16 linux-image-5.11.0-1015-kvm 5.11.0-1015.16 linux-image-5.11.0-1017-aws 5.11.0-1017.18 linux-image-5.11.0-1017-oracle 5.11.0-1017.18 linux-image-5.11.0-1017-raspi 5.11.0-1017.18 linux-image-5.11.0-1017-raspi-nolpae 5.11.0-1017.18 linux-image-5.11.0-1018-gcp 5.11.0-1018.20 linux-image-5.11.0-34-generic 5.11.0-34.36 linux-image-5.11.0-34-generic-64k 5.11.0-34.36 linux-image-5.11.0-34-generic-lpae 5.11.0-34.36 linux-image-5.11.0-34-lowlatency 5.11.0-34.36 linux-image-aws 5.11.0.1017.18 linux-image-azure 5.11.0.1015.16 linux-image-gcp 5.11.0.1018.18 linux-image-generic 5.11.0.34.36 linux-image-generic-64k 5.11.0.34.36 linux-image-generic-lpae 5.11.0.34.36 linux-image-gke 5.11.0.1018.18 linux-image-kvm 5.11.0.1015.16 linux-image-lowlatency 5.11.0.34.36 linux-image-oem-20.04 5.11.0.34.36 linux-image-oracle 5.11.0.1017.18 linux-image-raspi 5.11.0.1017.15 linux-image-raspi-nolpae 5.11.0.1017.15 linux-image-virtual 5.11.0.34.36 Ubuntu 20.04 LTS: linux-image-5.11.0-1015-azure 5.11.0-1015.16~20.04.1 linux-image-5.11.0-1017-aws 5.11.0-1017.18~20.04.1 linux-image-5.11.0-1017-oracle 5.11.0-1017.18~20.04.1 linux-image-5.11.0-34-generic 5.11.0-34.36~20.04.1 linux-image-5.11.0-34-generic-64k 5.11.0-34.36~20.04.1 linux-image-5.11.0-34-generic-lpae 5.11.0-34.36~20.04.1 linux-image-5.11.0-34-lowlatency 5.11.0-34.36~20.04.1 linux-image-aws 5.11.0.1017.18~20.04.16 linux-image-generic-64k-hwe-20.04 5.11.0.34.36~20.04.13 linux-image-generic-hwe-20.04 5.11.0.34.36~20.04.13 linux-image-generic-lpae-hwe-20.04 5.11.0.34.36~20.04.13 linux-image-lowlatency-hwe-20.04 5.11.0.34.36~20.04.13 linux-image-oracle 5.11.0.1017.18~20.04.10 linux-image-virtual-hwe-20.04 5.11.0.34.36~20.04.13 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: https://ubuntu.com/security/notices/USN-5070-1 CVE-2020-26541, CVE-2021-22543, CVE-2021-34693, CVE-2021-3612, CVE-2021-3653, CVE-2021-3656, CVE-2021-38198, CVE-2021-38200, CVE-2021-38206, CVE-2021-38207 Package Information: https://launchpad.net/ubuntu/+source/linux/5.11.0-34.36 https://launchpad.net/ubuntu/+source/linux-aws/5.11.0-1017.18 https://launchpad.net/ubuntu/+source/linux-azure/5.11.0-1015.16 https://launchpad.net/ubuntu/+source/linux-gcp/5.11.0-1018.20 https://launchpad.net/ubuntu/+source/linux-kvm/5.11.0-1015.16 https://launchpad.net/ubuntu/+source/linux-oracle/5.11.0-1017.18 https://launchpad.net/ubuntu/+source/linux-raspi/5.11.0-1017.18 https://launchpad.net/ubuntu/+source/linux-aws-5.11/5.11.0-1017.18~20.04.1 https://launchpad.net/ubuntu/+source/linux-azure-5.11/5.11.0-1015.16~20.04.1 https://launchpad.net/ubuntu/+source/linux-hwe-5.11/5.11.0-34.36~20.04.1 https://launchpad.net/ubuntu/+source/linux-oracle-5.11/5.11.0-1017.18~20.04.1

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

local

TYPE

buffer error

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

Red Hat

SOURCES

LAST UPDATE DATE

2026-03-25T20:44:38.210000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE