The following data is constructed from data provided by Red Hat's json file at:
https://access.redhat.com/security/data/csaf/v2/advisories/2023/rhsa-2023_5621.json
Red Hat officially shut down their mailing list notifications October 10, 2023.  Due to this, Packet Storm has recreated the below data as a reference point to raise awareness.  It must be noted that due to an inability to easily track revision updates without crawling Red Hat's archive. Going forward, these advisories are single notifications and we strongly suggest that you visit the Red Hat provided links to ensure you have the latest information available if the subject matter listed pertains to your environment.
- Packet Storm Staff
====================================================================
Red Hat Security Advisory
Synopsis:           Important: kernel-rt security and bug fix update
Advisory ID:        RHSA-2023:5621-01
Product:            Red Hat Enterprise Linux
Advisory URL:       https://access.redhat.com/errata/RHSA-2023:5621
Issue date:         2023-10-10
Revision:           01
CVE Names:          CVE-2023-3609
====================================================================
Summary: 
An update for kernel-rt 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:
The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.
Security Fix(es):
* kernel: net/sched: cls_u32 component reference counter leak if tcf_change_indev() fails (CVE-2023-3609)
* kernel: netfilter: use-after-free in nf_tables when processing batch requests can lead to privilege escalation (CVE-2023-32233)
* kernel: nf_tables: stack-out-of-bounds-read in nft_byteorder_eval() (CVE-2023-35001)
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):
* kernel-rt: update to the latest RHEL7.9.z26 source tree (BZ#2232239)
Solution:
https://access.redhat.com/articles/11258
CVEs:
CVE-2023-3609
References:
https://access.redhat.com/security/updates/classification/#important