-----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. Bugs fixed (https://bugzilla.redhat.com/): 1965461 - CVE-2021-22543 kernel: Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks 1971651 - CVE-2021-3609 kernel: race condition in net/can/bcm.c leads to local privilege escalation 1980101 - CVE-2021-22555 kernel: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c 6. 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. References: https://access.redhat.com/security/cve/CVE-2021-3609 https://access.redhat.com/security/cve/CVE-2021-22543 https://access.redhat.com/security/cve/CVE-2021-22555 https://access.redhat.com/security/updates/classification/#important 8. Contact: The Red Hat security contact is . 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