Security Vulnerabilities fixed in kernel-rt RHSA-2021:3088

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) 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) 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) SolutionFor 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.

Affected Applications

kernel-rt

CVE References

CVE-2021-3609 CVE-2021-22555 CVE-2021-22543

Other References

https://access.redhat.com/errata/RHSA-2021:3088