Important: kpatch-patch security update

Topic

An update for kpatch-patch is now available for Red Hat Enterprise Linux 9.0 Extended Update Support.

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.

Description

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: KVM: cmpxchg_gpte can write to pfns outside the userspace region (CVE-2022-1158)
• kernel: openvswitch: integer underflow leads to out-of-bounds write in reserve_sfa_size() (CVE-2022-2639)
• kernel: watch queue race condition can lead to privilege escalation (CVE-2022-2959)
• kernel: nfsd buffer overflow by RPC message over TCP with garbage data (CVE-2022-43945)

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.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux for x86_64 - Extended Update Support 9.0 x86_64
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 9.0 ppc64le
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.0 ppc64le
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.0 x86_64

Fixes

• BZ - 2069793 - CVE-2022-1158 kernel: KVM: cmpxchg_gpte can write to pfns outside the userspace region
• BZ - 2084479 - CVE-2022-2639 kernel: openvswitch: integer underflow leads to out-of-bounds write in reserve_sfa_size()
• BZ - 2103681 - CVE-2022-2959 kernel: watch queue race condition can lead to privilege escalation
• BZ - 2141752 - CVE-2022-43945 kernel: nfsd buffer overflow by RPC message over TCP with garbage data

CVEs

• CVE-2022-1158
• CVE-2022-2639
• CVE-2022-2959
• CVE-2022-43945

References

• https://access.redhat.com/security/updates/classification/#important