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RHSA-2021:3044: Red Hat Security Advisory: kpatch-patch security update

An update for kpatch-patch 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.This is a kernel live patch module which is automatically loaded by the RPM post-install script to modify the code of a running kernel. 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. Related CVEs:
  • CVE-2021-3609: kernel: race condition in net/can/bcm.c leads to local privilege escalation
  • CVE-2021-22543: kernel: Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks
  • CVE-2021-22555: kernel: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c
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