-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ==================================================================== Red Hat Security Advisory Synopsis: Moderate: kernel-rt security and bug fix update Advisory ID: RHSA-2021:5241-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2021:5241 Issue date: 2021-12-21 CVE Names: CVE-2021-20321 ==================================================================== 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 Moderate. 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 for NFV (v. 8) - x86_64 Red Hat Enterprise Linux for Real Time (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: In Overlayfs missing a check for a negative dentry before calling vfs_rename() (CVE-2021-20321) 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-8.5.z1 source tree (BZ#2023988) * [rt] RHEL-8.6: disable KASAN, KCSAN and UBSAN for kernel-rt (BZ#2026384) 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/): 2013242 - CVE-2021-20321 kernel: In Overlayfs missing a check for a negative dentry before calling vfs_rename() 6. Package List: Red Hat Enterprise Linux Real Time for NFV (v. 8): Source: kernel-rt-4.18.0-348.7.1.rt7.137.el8_5.src.rpm x86_64: kernel-rt-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm kernel-rt-core-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm kernel-rt-debug-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm kernel-rt-debug-core-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm kernel-rt-debug-debuginfo-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm kernel-rt-debug-devel-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm kernel-rt-debug-kvm-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm kernel-rt-debug-modules-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm kernel-rt-debug-modules-extra-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm kernel-rt-debuginfo-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm kernel-rt-debuginfo-common-x86_64-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm kernel-rt-devel-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm kernel-rt-kvm-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm kernel-rt-modules-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm kernel-rt-modules-extra-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm Red Hat Enterprise Linux for Real Time (v. 8): Source: kernel-rt-4.18.0-348.7.1.rt7.137.el8_5.src.rpm x86_64: kernel-rt-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm kernel-rt-core-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm kernel-rt-debug-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm kernel-rt-debug-core-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm kernel-rt-debug-debuginfo-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm kernel-rt-debug-devel-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm kernel-rt-debug-modules-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm kernel-rt-debug-modules-extra-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm kernel-rt-debuginfo-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm kernel-rt-debuginfo-common-x86_64-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm kernel-rt-devel-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm kernel-rt-modules-4.18.0-348.7.1.rt7.137.el8_5.x86_64.rpm kernel-rt-modules-extra-4.18.0-348.7.1.rt7.137.el8_5.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-2021-20321 https://access.redhat.com/security/updates/classification/#moderate 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 iQIVAwUBYcHa0dzjgjWX9erEAQiaqQ//fB2LPmDURdQ6D3GJ5ZOG5XmRHNcpp770 uDHTljggUK4DnM7422e47ysfmfCHILvDQF6HyUgyNUOaYfLu9OcpqFDrdMWHI2q3 TrSp78BiZqZumEJt0s2C4yMBFGiClExTSQLgWN2atS50+R74vnTQyxEoeLc4GB7R kNKk32EZ/okO8Gfmnh4+XAqhtotLNYQPlIdpRfhhEFy7/7PkmbGpMJAIW40ZCRc4 szEGhQ28HN8thbumpPPkajZI+maa13luxVMoRAogQ8Q+A9/rI0Qu9ZMrRMBhgGcn OqH9QfS9xwEN3m26lxPq7lkIvocCOtW5LZOSjR8MiCqyON6r1R+9rgPEOcGvASJP 56Vyg106iStzmm0DhEWXpvwLrmXeyw9FfKqprMmfytboBLwSVYKnqinrSkGH8PRm 7A/YSyOKICUdnRxVdpRjABT5mSTWavdFwyChG9+Elgtfjpmhar+fp3Uxm5kZ68A4 ubrx7XM7RPKwcdvGMQeuld/h4bdlI04iiqrWiVhBJtY6qxBCLib6vzbfacO/GNu1 12Eubuxq3dC9U7P2zhgJ3zqTuFTLSQ1UYJFD/uHYsKnxmjAKPyzXQ7yRFuElprSx fso02oy6UfHQ7zjawjEZJoJ55dxu+iIqAZDE4dlynQQ5sWYjuJPL5WlaQnKmsvKP cvTGLEO0elQ=mSvK -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://listman.redhat.com/mailman/listinfo/rhsa-announce