Important: kpatch-patch security update

Topic

An update for kpatch-patch is now available for Red Hat Enterprise Linux 7.

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: use-after-free in RDMA listen() (CVE-2021-4028)
• kernel: fget: check that the fd still exists after getting a ref to it (CVE-2021-4083)

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 Server 7 x86_64
• Red Hat Enterprise Linux for Power, little endian 7 ppc64le

Fixes

• BZ - 2027201 - CVE-2021-4028 kernel: use-after-free in RDMA listen()
• BZ - 2029923 - CVE-2021-4083 kernel: fget: check that the fd still exists after getting a ref to it

CVEs

• CVE-2021-4028
• CVE-2021-4083

References

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