RLSA-2021:3088

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RLSA-2021:3088

Summary: Important: kernel-rt security and bug fix update

Details: 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 Rocky Linux-8.4.z source tree (BZ#1985050) * kernel-rt: Merge mm/memcg: Fix kmem_cache_alloc() performance regression (BZ#1987102)

References: https://errata.rockylinux.org/RLSA-2021:3088, https://bugzilla.redhat.com/show_bug.cgi?id=1965461, https://bugzilla.redhat.com/show_bug.cgi?id=1971651, https://bugzilla.redhat.com/show_bug.cgi?id=1980101