ID

VAR-202105-1451

CVE

CVE-2021-22543

TITLE

Red Hat Security Advisory 2021-3802-01

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. 7) - noarch, 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. Bug Fix(es): * Indefinite waiting for RCU callback while removing cgroup (BZ#1967844) * kernel-rt: update to the latest RHEL7.9.z9 source tree (BZ#2002994) 4. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ===================================================================== Red Hat Security Advisory Synopsis: Important: kernel security and bug fix update Advisory ID: RHSA-2021:3801-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2021:3801 Issue date: 2021-10-12 CVE Names: CVE-2021-3653 CVE-2021-3656 CVE-2021-22543 CVE-2021-37576 ===================================================================== 1. Summary: An update for kernel is now available for Red Hat Enterprise Linux 7. 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 Client (v. 7) - noarch, x86_64 Red Hat Enterprise Linux Client Optional (v. 7) - x86_64 Red Hat Enterprise Linux ComputeNode (v. 7) - noarch, x86_64 Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64 Red Hat Enterprise Linux Server (v. 7) - noarch, ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, x86_64 Red Hat Enterprise Linux Workstation (v. 7) - noarch, x86_64 Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64 3. Description: The kernel packages contain the Linux kernel, the core of any Linux operating system. Bug Fix(es): * Kernel panic due to double fault with DLM reporting for socket error "sk_err=32/0" (BZ#1834878) * "MFW indication via attention" message getting logged frequently after every 5 minutes (BZ#1854544) * lpfc fails to discovery in pt2pt with "2754 PRLI failure DID:0000EF Status:x9/x91e00, data: x0" (BZ#1922479) * pcpu_get_vm_areas using most memory from VmallocUsed (BZ#1970618) * RHEL 7.9.z [qedf driver] Racing condition between qedf_cleanup_fcport and releasing command after timeout (BZ#1982702) * [Azure] RHEL 7.9 reports GPU/IB topology incorrectly on some Azure SKUs (BZ#1984128) * [stable guest ABI]Hot add CPU after migration cause guest hang (BZ#1991856) * i40e driver crash at RIP: i40e_config_vf_promiscuous_mode+0x165 (BZ#1993850) * [nfs] Performance issue since commit 5a4f6f11951e (BZ#1995649) * [kernel] Indefinite waiting for RCU callback while removing cgroup (BZ#2000973) 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 Client (v. 7): Source: kernel-3.10.0-1160.45.1.el7.src.rpm noarch: kernel-abi-whitelists-3.10.0-1160.45.1.el7.noarch.rpm kernel-doc-3.10.0-1160.45.1.el7.noarch.rpm x86_64: bpftool-3.10.0-1160.45.1.el7.x86_64.rpm bpftool-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debug-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debug-devel-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-1160.45.1.el7.x86_64.rpm kernel-devel-3.10.0-1160.45.1.el7.x86_64.rpm kernel-headers-3.10.0-1160.45.1.el7.x86_64.rpm kernel-tools-3.10.0-1160.45.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-tools-libs-3.10.0-1160.45.1.el7.x86_64.rpm perf-3.10.0-1160.45.1.el7.x86_64.rpm perf-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm python-perf-3.10.0-1160.45.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm Red Hat Enterprise Linux Client Optional (v. 7): x86_64: bpftool-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-1160.45.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-1160.45.1.el7.x86_64.rpm perf-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm Red Hat Enterprise Linux ComputeNode (v. 7): Source: kernel-3.10.0-1160.45.1.el7.src.rpm noarch: kernel-abi-whitelists-3.10.0-1160.45.1.el7.noarch.rpm kernel-doc-3.10.0-1160.45.1.el7.noarch.rpm x86_64: bpftool-3.10.0-1160.45.1.el7.x86_64.rpm bpftool-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debug-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debug-devel-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-1160.45.1.el7.x86_64.rpm kernel-devel-3.10.0-1160.45.1.el7.x86_64.rpm kernel-headers-3.10.0-1160.45.1.el7.x86_64.rpm kernel-tools-3.10.0-1160.45.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-tools-libs-3.10.0-1160.45.1.el7.x86_64.rpm perf-3.10.0-1160.45.1.el7.x86_64.rpm perf-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm python-perf-3.10.0-1160.45.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm Red Hat Enterprise Linux ComputeNode Optional (v. 7): x86_64: bpftool-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-1160.45.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-1160.45.1.el7.x86_64.rpm perf-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm Red Hat Enterprise Linux Server (v. 7): Source: kernel-3.10.0-1160.45.1.el7.src.rpm noarch: kernel-abi-whitelists-3.10.0-1160.45.1.el7.noarch.rpm kernel-doc-3.10.0-1160.45.1.el7.noarch.rpm ppc64: bpftool-3.10.0-1160.45.1.el7.ppc64.rpm bpftool-debuginfo-3.10.0-1160.45.1.el7.ppc64.rpm kernel-3.10.0-1160.45.1.el7.ppc64.rpm kernel-bootwrapper-3.10.0-1160.45.1.el7.ppc64.rpm kernel-debug-3.10.0-1160.45.1.el7.ppc64.rpm kernel-debug-debuginfo-3.10.0-1160.45.1.el7.ppc64.rpm kernel-debug-devel-3.10.0-1160.45.1.el7.ppc64.rpm kernel-debuginfo-3.10.0-1160.45.1.el7.ppc64.rpm kernel-debuginfo-common-ppc64-3.10.0-1160.45.1.el7.ppc64.rpm kernel-devel-3.10.0-1160.45.1.el7.ppc64.rpm kernel-headers-3.10.0-1160.45.1.el7.ppc64.rpm kernel-tools-3.10.0-1160.45.1.el7.ppc64.rpm kernel-tools-debuginfo-3.10.0-1160.45.1.el7.ppc64.rpm kernel-tools-libs-3.10.0-1160.45.1.el7.ppc64.rpm perf-3.10.0-1160.45.1.el7.ppc64.rpm perf-debuginfo-3.10.0-1160.45.1.el7.ppc64.rpm python-perf-3.10.0-1160.45.1.el7.ppc64.rpm python-perf-debuginfo-3.10.0-1160.45.1.el7.ppc64.rpm ppc64le: bpftool-3.10.0-1160.45.1.el7.ppc64le.rpm bpftool-debuginfo-3.10.0-1160.45.1.el7.ppc64le.rpm kernel-3.10.0-1160.45.1.el7.ppc64le.rpm kernel-bootwrapper-3.10.0-1160.45.1.el7.ppc64le.rpm kernel-debug-3.10.0-1160.45.1.el7.ppc64le.rpm kernel-debug-debuginfo-3.10.0-1160.45.1.el7.ppc64le.rpm kernel-debuginfo-3.10.0-1160.45.1.el7.ppc64le.rpm kernel-debuginfo-common-ppc64le-3.10.0-1160.45.1.el7.ppc64le.rpm kernel-devel-3.10.0-1160.45.1.el7.ppc64le.rpm kernel-headers-3.10.0-1160.45.1.el7.ppc64le.rpm kernel-tools-3.10.0-1160.45.1.el7.ppc64le.rpm kernel-tools-debuginfo-3.10.0-1160.45.1.el7.ppc64le.rpm kernel-tools-libs-3.10.0-1160.45.1.el7.ppc64le.rpm perf-3.10.0-1160.45.1.el7.ppc64le.rpm perf-debuginfo-3.10.0-1160.45.1.el7.ppc64le.rpm python-perf-3.10.0-1160.45.1.el7.ppc64le.rpm python-perf-debuginfo-3.10.0-1160.45.1.el7.ppc64le.rpm s390x: bpftool-3.10.0-1160.45.1.el7.s390x.rpm bpftool-debuginfo-3.10.0-1160.45.1.el7.s390x.rpm kernel-3.10.0-1160.45.1.el7.s390x.rpm kernel-debug-3.10.0-1160.45.1.el7.s390x.rpm kernel-debug-debuginfo-3.10.0-1160.45.1.el7.s390x.rpm kernel-debug-devel-3.10.0-1160.45.1.el7.s390x.rpm kernel-debuginfo-3.10.0-1160.45.1.el7.s390x.rpm kernel-debuginfo-common-s390x-3.10.0-1160.45.1.el7.s390x.rpm kernel-devel-3.10.0-1160.45.1.el7.s390x.rpm kernel-headers-3.10.0-1160.45.1.el7.s390x.rpm kernel-kdump-3.10.0-1160.45.1.el7.s390x.rpm kernel-kdump-debuginfo-3.10.0-1160.45.1.el7.s390x.rpm kernel-kdump-devel-3.10.0-1160.45.1.el7.s390x.rpm perf-3.10.0-1160.45.1.el7.s390x.rpm perf-debuginfo-3.10.0-1160.45.1.el7.s390x.rpm python-perf-3.10.0-1160.45.1.el7.s390x.rpm python-perf-debuginfo-3.10.0-1160.45.1.el7.s390x.rpm x86_64: bpftool-3.10.0-1160.45.1.el7.x86_64.rpm bpftool-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debug-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debug-devel-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-1160.45.1.el7.x86_64.rpm kernel-devel-3.10.0-1160.45.1.el7.x86_64.rpm kernel-headers-3.10.0-1160.45.1.el7.x86_64.rpm kernel-tools-3.10.0-1160.45.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-tools-libs-3.10.0-1160.45.1.el7.x86_64.rpm perf-3.10.0-1160.45.1.el7.x86_64.rpm perf-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm python-perf-3.10.0-1160.45.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm Red Hat Enterprise Linux Server Optional (v. 7): ppc64: bpftool-debuginfo-3.10.0-1160.45.1.el7.ppc64.rpm kernel-debug-debuginfo-3.10.0-1160.45.1.el7.ppc64.rpm kernel-debuginfo-3.10.0-1160.45.1.el7.ppc64.rpm kernel-debuginfo-common-ppc64-3.10.0-1160.45.1.el7.ppc64.rpm kernel-tools-debuginfo-3.10.0-1160.45.1.el7.ppc64.rpm kernel-tools-libs-devel-3.10.0-1160.45.1.el7.ppc64.rpm perf-debuginfo-3.10.0-1160.45.1.el7.ppc64.rpm python-perf-debuginfo-3.10.0-1160.45.1.el7.ppc64.rpm ppc64le: bpftool-debuginfo-3.10.0-1160.45.1.el7.ppc64le.rpm kernel-debug-debuginfo-3.10.0-1160.45.1.el7.ppc64le.rpm kernel-debug-devel-3.10.0-1160.45.1.el7.ppc64le.rpm kernel-debuginfo-3.10.0-1160.45.1.el7.ppc64le.rpm kernel-debuginfo-common-ppc64le-3.10.0-1160.45.1.el7.ppc64le.rpm kernel-tools-debuginfo-3.10.0-1160.45.1.el7.ppc64le.rpm kernel-tools-libs-devel-3.10.0-1160.45.1.el7.ppc64le.rpm perf-debuginfo-3.10.0-1160.45.1.el7.ppc64le.rpm python-perf-debuginfo-3.10.0-1160.45.1.el7.ppc64le.rpm x86_64: bpftool-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-1160.45.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-1160.45.1.el7.x86_64.rpm perf-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm Red Hat Enterprise Linux Workstation (v. 7): Source: kernel-3.10.0-1160.45.1.el7.src.rpm noarch: kernel-abi-whitelists-3.10.0-1160.45.1.el7.noarch.rpm kernel-doc-3.10.0-1160.45.1.el7.noarch.rpm x86_64: bpftool-3.10.0-1160.45.1.el7.x86_64.rpm bpftool-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debug-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debug-devel-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-1160.45.1.el7.x86_64.rpm kernel-devel-3.10.0-1160.45.1.el7.x86_64.rpm kernel-headers-3.10.0-1160.45.1.el7.x86_64.rpm kernel-tools-3.10.0-1160.45.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-tools-libs-3.10.0-1160.45.1.el7.x86_64.rpm perf-3.10.0-1160.45.1.el7.x86_64.rpm perf-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm python-perf-3.10.0-1160.45.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm Red Hat Enterprise Linux Workstation Optional (v. 7): x86_64: bpftool-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-1160.45.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-1160.45.1.el7.x86_64.rpm perf-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-1160.45.1.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. References: https://access.redhat.com/security/cve/CVE-2021-3653 https://access.redhat.com/security/cve/CVE-2021-3656 https://access.redhat.com/security/cve/CVE-2021-22543 https://access.redhat.com/security/cve/CVE-2021-37576 https://access.redhat.com/security/updates/classification/#important 8. 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 iQIVAwUBYWWqidzjgjWX9erEAQj5JA/+JDZu/xue2Mu3vd1Wr2SQNgVoy/tCYPKo z+zlQw1Eld1YcKgBrfF1b83yei3rp5foRyXsxl0wkcCvao3u8b/nTzX3ya3PxE6O yYV9VP4Nx8mmYsU6bw1yPAW7YLG4wS56Ff4kvZ+0EYKa14c6sZZ2qme98wBmfXm7 8/fvt+QlOVFSwcgqs9ME9vE/Ai/InXSnt5RDBNh9mxN8g44YqnsRwsUXrHAvCD7G RMMym2NJMYCHYs6rBBisK7LDD/pvS2xMZXAR57qy4sQhR0VyJpnLYd/FkrZjNdnr XpHLjrBHknunhoSmwf1fF4NYHfB0qQKUTi9drDUZLNKyI2vMrBYDQdSVVI78Kihh OBa0JdAYMeafduUQvHmTQihzYR/nGXykl0Eah4IpLlVXn6uQmjfsygqXZK3kLEv8 K4FOSiT7TKVq1gICE3D0c1UMAiRSAK25NjxLCKHpfKwKDWJV4kuHuVwa9Rx9TDVp P7mCmo6mVjqccRghcksV0L+y1rDdR4L+tBrJc1JfCHzaZtH7SV7jDNlW7FiPgnw4 5kDnWJk6IFgNUedydi2ODr/VPXIY+LCLWFTDY7RuQnNzgzGAn8bSfiVj7ddVKjxm d/EuZhWJxdkfd6V37Qa44wbv+EskoRbHdvZm6C+pjDBIe5ficos5TDkubKsEZxk5 dWp5Jpx6Lbw= =IUMH -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://listman.redhat.com/mailman/listinfo/rhsa-announce . 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. Solution: Before applying this update, make sure all previously released errata relevant to your system have been applied. 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. ========================================================================== 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. 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. 8.2) - aarch64, noarch, ppc64le, s390x, x86_64 3. Bug Fix(es): * [Regression] RHEL8.2 - ISST-LTE:pVM:diapvmlp83:sum:memory DLPAR fails to add memory on multiple trials[mm/memory_hotplug.c:1163] (mm-) (BZ#1930169) * Every server is displaying the same power levels for all of our i40e 25G interfaces. 10G interfaces seem to be correct. Ethtool version is 5.0 (BZ#1967100) * s390/uv: Fix handling of length extensions (BZ#1975657) * RHEL 8.3 using FCOE via a FastLinQ QL45000 card will not manually scan in LUN from Target_id's over 8 (BZ#1976265) * Backport "tick/nohz: Conditionally restart tick on idle exit" to RHEL 8.5 (BZ#1978711) * rhel8.3: phase 2 netfilter backports from upstream (BZ#1980323) * xfrm: backports from upstream (BZ#1981841) Enhancement(s): * [8.2.z] Incorrect parsing of ACPI HMAT table reports incorrect kernel WARNING taint (BZ#1943702) * Only selected patches from [IBM 8.4 FEAT] ibmvnic: Backport FW950 and assorted bug fixes (BZ#1980795) 4. 7.7) - 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

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

TYPE

bypass

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

Red Hat

SOURCES

LAST UPDATE DATE

2026-08-28T20:08:52.053000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE