Important: kernel security update

Topic

An update for kernel 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.

Description

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• kernel: use after free in unix_stream_sendpage (CVE-2023-4622)
• kernel: vmwgfx: reference count issue leads to use-after-free in surface handling (CVE-2023-5633)
• kernel: netfilter: potential slab-out-of-bound access due to integer underflow (CVE-2023-42753)
• Kernel: UAF during login when accessing the shost ipaddress (CVE-2023-2162)
• hw amd: Return Address Predictor vulnerability leading to information disclosure (CVE-2023-20569)

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.

Bug Fix(es):

• Backport OVS l4 Symmetric Hashing to rhel-8 (JIRA:RHEL-12746)
• Unbounded memory usage by TCP for receive buffers (JIRA:RHEL-15096)
• various kind of guests freeze on rhel 8.8 (JIRA:RHEL-15121)
• RHEL 8: netfilter: conntrack: Fix gre tunneling over ipv6 (JIRA:RHEL-15259)
• NFSv4.1 needs to handle ENOENT error from GETDEVICEINFO (JIRA:RHEL-16407)
• DM multipath showing failed path for an nvme-o-FC LUN when performing I/O operations (JIRA:RHEL-14718)

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

The system must be rebooted for this update to take effect.

Affected Products

• Red Hat Enterprise Linux for IBM z Systems 8 s390x
• Red Hat Enterprise Linux for Power, little endian 8 ppc64le
• Red Hat Enterprise Linux for ARM 64 8 aarch64
• Red Hat CodeReady Linux Builder for x86_64 8 x86_64
• Red Hat CodeReady Linux Builder for Power, little endian 8 ppc64le
• Red Hat CodeReady Linux Builder for ARM 64 8 aarch64

Fixes

• BZ - 2187773 - CVE-2023-2162 Kernel: UAF during login when accessing the shost ipaddress
• BZ - 2207625 - CVE-2023-20569 hw amd: Return Address Predictor vulnerability leading to information disclosure
• BZ - 2237760 - CVE-2023-4622 kernel: use after free in unix_stream_sendpage
• BZ - 2239843 - CVE-2023-42753 kernel: netfilter: potential slab-out-of-bound access due to integer underflow
• BZ - 2245663 - CVE-2023-5633 kernel: vmwgfx: reference count issue leads to use-after-free in surface handling

CVEs

• CVE-2023-2162
• CVE-2023-4622
• CVE-2023-5633
• CVE-2023-20569
• CVE-2023-42753

References

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