Important: kernel security update

Topic

An update for kernel is now available for Red Hat Enterprise Linux 8.2 Advanced Update Support, Red Hat Enterprise Linux 8.2 Telecommunications Update Service, and Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions.

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: bpf: Incorrect verifier pruning leads to unsafe code paths being incorrectly marked as safe (CVE-2023-2163)
• kernel: use after free in unix_stream_sendpage (CVE-2023-4622)
• kernel: netfilter: potential slab-out-of-bound access due to integer underflow (CVE-2023-42753)
• kernel: Race Condition leading to UAF in Unix Socket could happen in sk_receive_queue (BZ#2230094)
• kernel: UAF during login when accessing the shost ipaddress (CVE-2023-2162)
• hw: amd: Cross-Process Information Leak (CVE-2023-20593)

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

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

Affected Products

• Red Hat Enterprise Linux Server - AUS 8.2 x86_64
• Red Hat Enterprise Linux Server - TUS 8.2 x86_64
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 8.2 ppc64le
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 8.2 x86_64

Fixes

• BZ - 2187773 - CVE-2023-2162 kernel: UAF during login when accessing the shost ipaddress
• BZ - 2217845 - CVE-2023-20593 hw: amd: Cross-Process Information Leak
• BZ - 2230094 - kernel: Race Condition leading to UAF in Unix Socket could happen in sk_receive_queue
• 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 - 2240249 - CVE-2023-2163 kernel: bpf: Incorrect verifier pruning leads to unsafe code paths being incorrectly marked as safe

CVEs

• CVE-2023-2162
• CVE-2023-2163
• CVE-2023-4622
• CVE-2023-20593
• CVE-2023-42753

References

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