RHSA-2021:3044: Important: kpatch-patch security update
First published: Tue Aug 10 2021(Updated: )
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.<br>Security Fix(es):<br><li> kernel: race condition in net/can/bcm.c leads to local privilege escalation (CVE-2021-3609)</li> <li> kernel: Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks (CVE-2021-22543)</li> <li> kernel: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c (CVE-2021-22555)</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 | Affected Version | How to fix |
|---|---|---|
| redhat/kpatch-patch | <4_18_0-305-1-4.el8 | 4_18_0-305-1-4.el8 |
| redhat/kpatch-patch | <4_18_0-305_10_2-1-1.el8_4 | 4_18_0-305_10_2-1-1.el8_4 |
| redhat/kpatch-patch | <4_18_0-305_3_1-1-3.el8_4 | 4_18_0-305_3_1-1-3.el8_4 |
| redhat/kpatch-patch | <4_18_0-305_7_1-1-2.el8_4 | 4_18_0-305_7_1-1-2.el8_4 |
| redhat/kpatch-patch | <4_18_0-305-1-4.el8 | 4_18_0-305-1-4.el8 |
| redhat/kpatch-patch | <4_18_0-305-debuginfo-1-4.el8 | 4_18_0-305-debuginfo-1-4.el8 |
| redhat/kpatch-patch | <4_18_0-305-debugsource-1-4.el8 | 4_18_0-305-debugsource-1-4.el8 |
| redhat/kpatch-patch | <4_18_0-305_10_2-1-1.el8_4 | 4_18_0-305_10_2-1-1.el8_4 |
| redhat/kpatch-patch | <4_18_0-305_10_2-debuginfo-1-1.el8_4 | 4_18_0-305_10_2-debuginfo-1-1.el8_4 |
| redhat/kpatch-patch | <4_18_0-305_10_2-debugsource-1-1.el8_4 | 4_18_0-305_10_2-debugsource-1-1.el8_4 |
| redhat/kpatch-patch | <4_18_0-305_3_1-1-3.el8_4 | 4_18_0-305_3_1-1-3.el8_4 |
| redhat/kpatch-patch | <4_18_0-305_3_1-debuginfo-1-3.el8_4 | 4_18_0-305_3_1-debuginfo-1-3.el8_4 |
| redhat/kpatch-patch | <4_18_0-305_3_1-debugsource-1-3.el8_4 | 4_18_0-305_3_1-debugsource-1-3.el8_4 |
| redhat/kpatch-patch | <4_18_0-305_7_1-1-2.el8_4 | 4_18_0-305_7_1-1-2.el8_4 |
| redhat/kpatch-patch | <4_18_0-305_7_1-debuginfo-1-2.el8_4 | 4_18_0-305_7_1-debuginfo-1-2.el8_4 |
| redhat/kpatch-patch | <4_18_0-305_7_1-debugsource-1-2.el8_4 | 4_18_0-305_7_1-debugsource-1-2.el8_4 |
| redhat/kpatch-patch | <4_18_0-305-1-4.el8 | 4_18_0-305-1-4.el8 |
| redhat/kpatch-patch | <4_18_0-305-debuginfo-1-4.el8 | 4_18_0-305-debuginfo-1-4.el8 |
| redhat/kpatch-patch | <4_18_0-305-debugsource-1-4.el8 | 4_18_0-305-debugsource-1-4.el8 |
| redhat/kpatch-patch | <4_18_0-305_10_2-1-1.el8_4 | 4_18_0-305_10_2-1-1.el8_4 |
| redhat/kpatch-patch | <4_18_0-305_10_2-debuginfo-1-1.el8_4 | 4_18_0-305_10_2-debuginfo-1-1.el8_4 |
| redhat/kpatch-patch | <4_18_0-305_10_2-debugsource-1-1.el8_4 | 4_18_0-305_10_2-debugsource-1-1.el8_4 |
| redhat/kpatch-patch | <4_18_0-305_3_1-1-3.el8_4 | 4_18_0-305_3_1-1-3.el8_4 |
| redhat/kpatch-patch | <4_18_0-305_3_1-debuginfo-1-3.el8_4 | 4_18_0-305_3_1-debuginfo-1-3.el8_4 |
| redhat/kpatch-patch | <4_18_0-305_3_1-debugsource-1-3.el8_4 | 4_18_0-305_3_1-debugsource-1-3.el8_4 |
| redhat/kpatch-patch | <4_18_0-305_7_1-1-2.el8_4 | 4_18_0-305_7_1-1-2.el8_4 |
| redhat/kpatch-patch | <4_18_0-305_7_1-debuginfo-1-2.el8_4 | 4_18_0-305_7_1-debuginfo-1-2.el8_4 |
| redhat/kpatch-patch | <4_18_0-305_7_1-debugsource-1-2.el8_4 | 4_18_0-305_7_1-debugsource-1-2.el8_4 |
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Reference Links
Frequently Asked Questions
What is the severity of RHSA-2021:3044?
The severity of RHSA-2021:3044 is critical due to the privilege escalation risk associated with the vulnerability.
How do I fix RHSA-2021:3044?
To fix RHSA-2021:3044, you should update the kpatch-patch package to the remedied versions provided in the advisory.
What vulnerability does RHSA-2021:3044 address?
RHSA-2021:3044 addresses a race condition vulnerability in the kernel that could lead to local privilege escalation (CVE-2021-3609).
Which systems are affected by RHSA-2021:3044?
RHSA-2021:3044 affects Red Hat Enterprise Linux 8 systems running specific versions of the kpatch-patch package.
Is there a workaround for RHSA-2021:3044?
There is no official workaround for RHSA-2021:3044; applying the recommended updates is necessary to mitigate the vulnerability.
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