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_5627.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

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Red Hat Security Advisory

Synopsis: Important: kernel security, bug fix, and enhancement update
Advisory ID: RHSA-2023:5627-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2023:5627
Issue date: 2023-10-10
Revision: 01
CVE Names: CVE-2020-36558
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Summary:

An update for kernel is now available for Red Hat Enterprise Linux 8.6 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:

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

Security Fix(es):

* kernel: use-after-free vulnerability in the perf_group_detach function of the Linux Kernel Performance Events (CVE-2023-2235)

* kernel: ipvlan: out-of-bounds write caused by unclear skb->cb (CVE-2023-3090)

* kernel: netfilter: use-after-free due to improper element removal in nft_pipapo_remove() (CVE-2023-4004)

* kernel: net/sched: Use-after-free vulnerabilities in the net/sched classifiers: cls_fw, cls_u32 and cls_route (CVE-2023-4128)

* kernel: nf_tables: stack-out-of-bounds-read in nft_byteorder_eval() (CVE-2023-35001)

* kernel: race condition in VT_RESIZEX ioctl when vc_cons[i].d is already NULL leading to NULL pointer dereference (CVE-2020-36558)

* kernel: LoadPin bypass via dm-verity table reload (CVE-2022-2503)

* kernel: an out-of-bounds vulnerability in i2c-ismt driver (CVE-2022-2873)

* kernel: xfrm_expand_policies() in net/xfrm/xfrm_policy.c can cause a refcount to be dropped twice (CVE-2022-36879)

* kernel: use-after-free due to race condition in qdisc_graft() (CVE-2023-0590)

* kernel: netfilter: NULL pointer dereference in nf_tables due to zeroed list head (CVE-2023-1095)

* kernel: hash collisions in the IPv6 connection lookup table (CVE-2023-1206)

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):

* [HPEMC RHEL 8 REGRESSION] acpi-cpufreq: Skip initialization if a cpufreq driver exists (BZ#2186307)

* [max] RHEL8.4 Pre-Alpha - [ 4.18.0-240.4.el8.dt2.ppc64le ][ fleetwood / P9 64TB/192c ] While performing DLPAR CPU operations \"BUG: arch topology borken\" messages are observed and CPU remove operation fails for removal of 140 with 255 return (BZ#2210295)

* [Intel 8.8 BUG] [SPR] IOMMU: QAT Device Address Translation Issue with Invalidation Completion Ordering (BZ#2221098)

* avoid unnecessary page fault retires on shared memory types (BZ#2221101)

* [i40e] error: Cannot set interface MAC/vlanid to 1e:b7:e2:02:b1:aa/0 for ifname ens4f0 vf 0: Resource temporarily unavailable (BZ#2228164)

* oops on cifs_mount due to null tcon (BZ#2229129)

* kernel panic due to stack overflow on ppc64le due to deep call chain. (BZ#2230268)

* [Hyper-V][RHEL 8]incomplete fc_transport implementation in storvsc causes null dereference in fc_timed_out() (BZ#2230744)

* Withdrawal: GFS2: couldn't freeze filesystem: -16 (BZ#2231826)

* [RHEL 8][Hyper-V]Excessive hv_storvsc driver logging with srb_status SRB_STATUS_INTERNAL_ERROR (0x30) (BZ#2231989)

* kernel-devel RPM cross-compiled by CKI contains host-arch scripts (BZ#2232138)

* RHEL-8: crypto: rng - Fix lock imbalance in crypto_del_rng (BZ#2232216)

* [Intel 8.9] iavf: Driver Update (BZ#2232400)

* Important iavf bug fixes July 2023 (BZ#2232401)

* iavf: hang in iavf_remove() - SNO node hangs after running systemctl reboot (BZ#2232404)

* [RHEL 8.9] Proactively backport locking fixes from upstream (BZ#2235394)

* NAT sport clash in OCP causing 1 second TCP connection establishment delay. (BZ#2236515)

* xfs: mount fails when device file name is long (BZ#2236814)

* netfilter: RHEL 8.8 phase 2 backports from upstream (BZ#2236817)

* swap deadlock when attempt to charge a page to a cgroup stalls waiting on I/O plugged on another task in swap code (BZ#2237686)

Enhancement(s):

* [Intel 8.7 FEAT] TSC: Avoid clock watchdog when not needed (BZ#2216051)

Solution:

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

CVEs:

CVE-2020-36558

References:

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