RHSA-2021:3088: Important: kernel-rt security and bug fix update
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 VMIO|VMPFNMAP vmas in KVM can bypass RO checks (CVE-2021-22543) kernel: out-of-bounds write in xtcompattargetfromuser() in net/netfilter/xtables.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 kmemcachealloc() performance regression (BZ#1987102)
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of RHSA-2021:3088?
The severity of RHSA-2021:3088 is classified as high due to the potential for local privilege escalation.
How do I fix RHSA-2021:3088?
To fix RHSA-2021:3088, upgrade to kernel-rt packages version 4.18.0-305.12.1.rt7.84.el8_4 or later.
What vulnerability is addressed in RHSA-2021:3088?
RHSA-2021:3088 addresses a race condition vulnerability in net/can/bcm.c that can lead to local privilege escalation (CVE-2021-3609).
Which packages are affected by RHSA-2021:3088?
The affected packages in RHSA-2021:3088 include kernel-rt, kernel-rt-core, kernel-rt-debug, among others, prior to the specified patch version.
Is a reboot required after applying the fix for RHSA-2021:3088?
Yes, a reboot is typically required after applying the kernel updates to ensure the changes take effect.