RHSA-2021:3812: Important: kernel security update
The kernel packages contain the Linux kernel, the core of any Linux operating system.<br>Security Fix(es):<br><li> kernel: Improper handling of VMIO|VMPFNMAP vmas in KVM can bypass RO checks (CVE-2021-22543)</li> <li> kernel: out-of-bounds write in xtcompattargetfromuser() in net/netfilter/xtables.c (CVE-2021-22555)</li> <li> kernel: powerpc: KVM guest OS users can cause host OS memory corruption (CVE-2021-37576)</li> <li> kernel: SVM nested virtualization issue in KVM (AVIC support) (CVE-2021-3653)</li> <li> kernel: SVM nested virtualization issue in KVM (VMLOAD/VMSAVE) (CVE-2021-3656)</li> 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.
Affected Software
Remediation
Event History
Frequently Asked Questions
What are the security fixes associated with RHSA-2021:3812?
RHSA-2021:3812 addresses improper handling of VM_IO|VM_PFNMAP vmas in KVM and an out-of-bounds write in the xt_compat_target_from_user() function.
What is the severity of RHSA-2021:3812?
The severity of RHSA-2021:3812 is classified as important.
How do I fix RHSA-2021:3812?
To fix RHSA-2021:3812, update the affected kernel packages to version 3.10.0-957.84.1.el7 or later.
Which packages are affected by RHSA-2021:3812?
Affected packages include kernel, bpftool, kernel-debug, and kernel-devel, among others.
What Linux kernel versions are vulnerable under RHSA-2021:3812?
The vulnerable versions under RHSA-2021:3812 are those prior to 3.10.0-957.84.1.el7.