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. These packages include redhat-release-virtualization-host. RHVH features a Cockpit user interface for monitoring the host's resources and performing administrative tasks. (BZ#2010171) 4. Summary: Red Hat Advanced Cluster Management for Kubernetes 2.3.3 General Availability release images, which fix bugs, provide security fixes, and update container images. Description: Red Hat Advanced Cluster Management for Kubernetes 2.3.3 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/ Note: Because Red Hat OpenShift Container Platform version 4.9 was just released, the functional testing of the compatibility between Red Hat Advanced Cluster Management 2.3.3 and Red Hat OpenShift Container Platform version 4.9 is still in progress. Security fixes: * nginx: Off-by-one in ngx_resolver_copy() when labels are followed by a pointer to a root domain name (CVE-2021-23017) * redis: Lua scripts can overflow the heap-based Lua stack (CVE-2021-32626) * redis: Integer overflow issue with Streams (CVE-2021-32627) * redis: Integer overflow bug in the ziplist data structure (CVE-2021-32628) * redis: Integer overflow issue with intsets (CVE-2021-32687) * redis: Integer overflow issue with strings (CVE-2021-41099) * redis: Out of bounds read in lua debugger protocol parser (CVE-2021-32672) * redis: Denial of service via Redis Standard Protocol (RESP) request (CVE-2021-32675) * helm: information disclosure vulnerability (CVE-2021-32690) Bug fixes: * KUBE-API: Support move agent to different cluster in the same namespace (BZ# 1977358) * Add columns to the Agent CRD list (BZ# 1977398) * ClusterDeployment controller watches all Secrets from all namespaces (BZ# 1986081) * RHACM 2.3.3 images (BZ# 1999365) * Workaround for Network Manager not supporting nmconnections priority (BZ# 2001294) * create cluster page empty in Safary Browser (BZ# 2002280) * Compliance state doesn't get updated after fixing the issue causing initially the policy not being able to update the managed object (BZ# 2002667) * Overview page displays VMware based managed cluster as other (BZ# 2004188) 3. Solution: Before applying this update, make sure all previously released errata relevant to your system have been applied. Bugs fixed (https://bugzilla.redhat.com/): 1963121 - CVE-2021-23017 nginx: Off-by-one in ngx_resolver_copy() when labels are followed by a pointer to a root domain name 1977358 - [4.8.0] KUBE-API: Support move agent to different cluster in the same namespace 1977398 - [4.8.0] [master] Add columns to the Agent CRD list 1978144 - CVE-2021-32690 helm: information disclosure vulnerability 1986081 - [4.8.0] ClusterDeployment controller watches all Secrets from all namespaces 1999365 - RHACM 2.3.3 images 2001294 - [4.8.0] Workaround for Network Manager not supporting nmconnections priority 2002280 - create cluster page empty in Safary Browser 2002667 - Compliance state doesn't get updated after fixing the issue causing initially the policy not being able to update the managed object 2004188 - Overview page displays VMware based managed cluster as other 2010991 - CVE-2021-32687 redis: Integer overflow issue with intsets 2011000 - CVE-2021-32675 redis: Denial of service via Redis Standard Protocol (RESP) request 2011001 - CVE-2021-32672 redis: Out of bounds read in lua debugger protocol parser 2011004 - CVE-2021-32628 redis: Integer overflow bug in the ziplist data structure 2011010 - CVE-2021-32627 redis: Integer overflow issue with Streams 2011017 - CVE-2021-32626 redis: Lua scripts can overflow the heap-based Lua stack 2011020 - CVE-2021-41099 redis: Integer overflow issue with strings 5. 8) - 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. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ===================================================================== Red Hat Security Advisory Synopsis: Important: kernel-rt security and bug fix update Advisory ID: RHSA-2021:3088-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2021:3088 Issue date: 2021-08-10 CVE Names: CVE-2021-3609 CVE-2021-22543 CVE-2021-22555 ===================================================================== 1. Summary: An update for kernel-rt is now available for Red Hat Enterprise Linux 8. 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 Real Time (v. 8) - x86_64 Red Hat Enterprise Linux Real Time for NFV (v. 8) - x86_64 3. Description: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Security Fix(es): * kernel: race condition in net/can/bcm.c leads to local privilege escalation (CVE-2021-3609) * kernel: Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks (CVE-2021-22543) * kernel: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c (CVE-2021-22555) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. Bug Fix(es): * kernel-rt: update RT source tree to the RHEL-8.4.z source tree (BZ#1985050) * kernel-rt: Merge mm/memcg: Fix kmem_cache_alloc() performance regression (BZ#1987102) 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 Real Time for NFV (v. 8): Source: kernel-rt-4.18.0-305.12.1.rt7.84.el8_4.src.rpm x86_64: kernel-rt-4.18.0-305.12.1.rt7.84.el8_4.x86_64.rpm kernel-rt-core-4.18.0-305.12.1.rt7.84.el8_4.x86_64.rpm kernel-rt-debug-4.18.0-305.12.1.rt7.84.el8_4.x86_64.rpm kernel-rt-debug-core-4.18.0-305.12.1.rt7.84.el8_4.x86_64.rpm kernel-rt-debug-debuginfo-4.18.0-305.12.1.rt7.84.el8_4.x86_64.rpm kernel-rt-debug-devel-4.18.0-305.12.1.rt7.84.el8_4.x86_64.rpm kernel-rt-debug-kvm-4.18.0-305.12.1.rt7.84.el8_4.x86_64.rpm kernel-rt-debug-modules-4.18.0-305.12.1.rt7.84.el8_4.x86_64.rpm kernel-rt-debug-modules-extra-4.18.0-305.12.1.rt7.84.el8_4.x86_64.rpm kernel-rt-debuginfo-4.18.0-305.12.1.rt7.84.el8_4.x86_64.rpm kernel-rt-debuginfo-common-x86_64-4.18.0-305.12.1.rt7.84.el8_4.x86_64.rpm kernel-rt-devel-4.18.0-305.12.1.rt7.84.el8_4.x86_64.rpm kernel-rt-kvm-4.18.0-305.12.1.rt7.84.el8_4.x86_64.rpm kernel-rt-modules-4.18.0-305.12.1.rt7.84.el8_4.x86_64.rpm kernel-rt-modules-extra-4.18.0-305.12.1.rt7.84.el8_4.x86_64.rpm Red Hat Enterprise Linux Real Time (v. 8): Source: kernel-rt-4.18.0-305.12.1.rt7.84.el8_4.src.rpm x86_64: kernel-rt-4.18.0-305.12.1.rt7.84.el8_4.x86_64.rpm kernel-rt-core-4.18.0-305.12.1.rt7.84.el8_4.x86_64.rpm kernel-rt-debug-4.18.0-305.12.1.rt7.84.el8_4.x86_64.rpm kernel-rt-debug-core-4.18.0-305.12.1.rt7.84.el8_4.x86_64.rpm kernel-rt-debug-debuginfo-4.18.0-305.12.1.rt7.84.el8_4.x86_64.rpm kernel-rt-debug-devel-4.18.0-305.12.1.rt7.84.el8_4.x86_64.rpm kernel-rt-debug-modules-4.18.0-305.12.1.rt7.84.el8_4.x86_64.rpm kernel-rt-debug-modules-extra-4.18.0-305.12.1.rt7.84.el8_4.x86_64.rpm kernel-rt-debuginfo-4.18.0-305.12.1.rt7.84.el8_4.x86_64.rpm kernel-rt-debuginfo-common-x86_64-4.18.0-305.12.1.rt7.84.el8_4.x86_64.rpm kernel-rt-devel-4.18.0-305.12.1.rt7.84.el8_4.x86_64.rpm kernel-rt-modules-4.18.0-305.12.1.rt7.84.el8_4.x86_64.rpm kernel-rt-modules-extra-4.18.0-305.12.1.rt7.84.el8_4.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 iQIVAwUBYRJ8VtzjgjWX9erEAQipBA//VAUAxmSqXU2mTwkXN8IHvRc3ZHwnyZJS HHLYjeaXijPFjGor+JvG91BIuYiR35TVkz8R5H2H7p1X0SssSBA4PXRTb/awajd3 0XSoQmUFRJn2AZmGpWisqA2gvVCLSNwFZnkPIHev2lJN/RrnC90xdhVeYdk1Q0Mw r7LtMT4K/dI6kBPKboFdaEmuIP3E7OOrKE9YmZ2S5kPfDRP+CowIfFigpMNqWWv6 hyTo5MRzrteICyaI41WWX2kVW779F0GDKlTVTy1F45lLz1W/HLnavD9YB6pUhx5t u2UIP7W7thDNt9+ztSKvaDQSdAcTlnX9GpYWS5/4hSUONtJfJd7dHFY9RnVFfIrm 3xhox7E9oCMuRgaYDW96mSNR7Lt1Nbm70p2WOtjkKEvjzJ9njCxYCmozbIA8dUmt q2u+zPApt82GFV8ya2jjHOPmFL8oqOVnnxv4ofrm8HDubDuOoG4z4FkfXz2o/pn1 a5KN1QQjwSzFS/e8nGFwYlARyjEIz1D6+4fbdNNfNXCS5iBElQ1Gfk0Bh+9uMZiX kK67XL3UPS7ymSpyuE/h47JAFtCrVJ/JIWKpiNVFpPIY9lG/C7yMXMpJOTE+fb/b AnYMzfWHrkOdb2ks4DWW3826XLAWTMHZPdiT6yWzX4gnwTqdBgrBDlAKnVq6NnE9 HhmjU48kbcE= =I9nv -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://listman.redhat.com/mailman/listinfo/rhsa-announce . 8.1) - aarch64, noarch, ppc64le, s390x, x86_64 3. ========================================================================== Ubuntu Security Notice USN-5120-1 October 21, 2021 linux-azure-5.8 vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 20.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux-azure-5.8: Linux kernel for Microsoft Azure cloud systems Details: 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 (system crash) or possibly execute arbitrary code. (CVE-2019-19449) 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 for AMD processors in the Linux kernel did not ensure enough processing time was given to perform cleanups of large SEV VMs. A local attacker could use this to cause a denial of service (soft lockup). (CVE-2020-36311) 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) 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 Linux kernel did not properly account for the memory usage of certain IPC objects. A local attacker could use this to cause a denial of service (memory exhaustion). (CVE-2021-3759) Michael Wakabayashi discovered that the NFSv4 client implementation in the Linux kernel did not properly order connection setup operations. An attacker controlling a remote NFS server could use this to cause a denial of service on the client. (CVE-2021-38199) 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) It was discovered that the ext4 file system in the Linux kernel contained a race condition when writing xattrs to an inode. A local attacker could use this to cause a denial of service or possibly gain administrative privileges. (CVE-2021-40490) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS: linux-image-5.8.0-1043-azure 5.8.0-1043.46~20.04.1 linux-image-azure 5.8.0.1043.46~20.04.15 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-5120-1 CVE-2019-19449, CVE-2020-26541, CVE-2020-36311, CVE-2021-22543, CVE-2021-3612, CVE-2021-3759, CVE-2021-38199, CVE-2021-38207, CVE-2021-40490 Package Information: https://launchpad.net/ubuntu/+source/linux-azure-5.8/5.8.0-1043.46~20.04.1

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

local

TYPE

buffer error

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

Red Hat

SOURCES

LAST UPDATE DATE

2025-08-11T22:54:57.767000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE