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_6901.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, 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, bug fix, and enhancement update
Advisory ID:        RHSA-2023:6901-01
Product:            Red Hat Enterprise Linux
Advisory URL:       https://access.redhat.com/errata/RHSA-2023:6901
Issue date:         2023-11-14
Revision:           01
CVE Names:          CVE-2021-43975
====================================================================

Summary: 

An update for kernel-rt 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-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

* kernel: tun: double free in tun_free_netdev (CVE-2022-4744)

* kernel: net/sched: cls_u32 component reference counter leak (CVE-2023-3609)

* kernel: net/sched: sch_qfq vulnerability (CVE-2023-3611)

* kernel: net/sched: Use-after-free vulnerabilities in the net/sched classifiers: cls_fw, cls_u32 and cls_route (CVE-2023-4128, CVE-2023-4206, CVE-2023-4207, CVE-2023-4208)

* kernel: out-of-bounds write in qfq_change_class function (CVE-2023-31436)

* kernel: out-of-bounds write in hw_atl_utils_fw_rpc_wait (CVE-2021-43975)

* kernel: Rate limit overflow messages in r8152 in intr_callback (CVE-2022-3594)

* kernel: use-after-free and info leak in l2cap_conn_del and l2cap_parse_conf_req (CVE-2022-3640, CVE-2022-42895)

* kernel: double free in usb_8dev_start_xmit (CVE-2022-28388)

* kernel: vmwgfx: multiple vulnerabilities (CVE-2022-38457, CVE-2022-40133, CVE-2023-33951, CVE-2023-33952)

* hw: Intel: Gather Data Sampling (GDS) side channel vulnerability (CVE-2022-40982)

* kernel: KVM: multiple vulnerabilities (CVE-2022-45869, CVE-2023-4155, CVE-2023-30456)

* kernel: memory leak in ttusb_dec_exit_dvb (CVE-2022-45887)

* kernel: speculative pointer dereference in do_prlimit in kernel/sys.c (CVE-2023-0458)

* kernel: use-after-free in qdisc_graft (CVE-2023-0590)

* kernel: x86/mm: Randomize per-cpu entry area (CVE-2023-0597)

* kernel: HID: check empty report_list in hid_validate_values (CVE-2023-1073)

* kernel: sctp: fail if no bound addresses can be used for a given scope (CVE-2023-1074)

* kernel: hid: Use After Free in asus_remove (CVE-2023-1079)

* kernel: use-after-free in drivers/media/rc/ene_ir.c (CVE-2023-1118)

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

* kernel: ovl: fix use after free in struct ovl_aio_req (CVE-2023-1252)

* kernel: denial of service in tipc_conn_close (CVE-2023-1382)

* kernel: Use after free bug in btsdio_remove (CVE-2023-1989)

* kernel: Spectre v2 SMT mitigations problem (CVE-2023-1998)

* kernel: ext4: use-after-free in ext4_xattr_set_entry (CVE-2023-2513)

* kernel: fbcon: shift-out-of-bounds in fbcon_set_font (CVE-2023-3161)

* kernel: out-of-bounds access in relay_file_read (CVE-2023-3268)

* kernel: xfrm: NULL pointer dereference in xfrm_update_ae_params (CVE-2023-3772)

* kernel: smsusb: use-after-free caused by do_submit_urb (CVE-2023-4132)

* kernel: Race between task migrating pages and another task calling exit_mmap to release those same pages getting invalid opcode BUG in include/linux/swapops.h (CVE-2023-4732)

* Kernel: denial of service in atm_tc_enqueue (CVE-2023-23455)

* kernel: mpls: double free on sysctl allocation failure (CVE-2023-26545)

* kernel: Denial of service issue in az6027 driver (CVE-2023-28328)

* kernel: lib/seq_buf.c has a seq_buf_putmem_hex buffer overflow (CVE-2023-28772)

* kernel: blocking operation in dvb_frontend_get_event and wait_event_interruptible (CVE-2023-31084)

* kernel: net: qcom/emac: race condition leading to use-after-free in emac_remove (CVE-2023-33203)

* kernel: saa7134: race condition in saa7134_finidev (CVE-2023-35823)

* kernel: dm1105: race condition in dm1105_remove.c (CVE-2023-35824)

* kernel: r592: race condition in r592_remove (CVE-2023-35825)

* kernel: net/tls: tls_is_tx_ready checked list_entry (CVE-2023-1075)

* kernel: use-after-free bug in remove function xgene_hwmon_remove (CVE-2023-1855)

* kernel: Use after free in r592_remove (CVE-2023-3141)

* kernel: gfs2: NULL pointer dereference in gfs2_evict_inode (CVE-2023-3212)

For more details about the security issue(s), refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.9 Release Notes linked from the References section.


Solution:

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



CVEs:

CVE-2021-43975

References:

https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.9_release_notes/index
https://access.redhat.com/solutions/7027704
https://bugzilla.redhat.com/show_bug.cgi?id=2024989
https://bugzilla.redhat.com/show_bug.cgi?id=2073091
https://bugzilla.redhat.com/show_bug.cgi?id=2133453
https://bugzilla.redhat.com/show_bug.cgi?id=2133455
https://bugzilla.redhat.com/show_bug.cgi?id=2139610
https://bugzilla.redhat.com/show_bug.cgi?id=2147356
https://bugzilla.redhat.com/show_bug.cgi?id=2148520
https://bugzilla.redhat.com/show_bug.cgi?id=2149024
https://bugzilla.redhat.com/show_bug.cgi?id=2151317
https://bugzilla.redhat.com/show_bug.cgi?id=2156322
https://bugzilla.redhat.com/show_bug.cgi?id=2165741
https://bugzilla.redhat.com/show_bug.cgi?id=2165926
https://bugzilla.redhat.com/show_bug.cgi?id=2168332
https://bugzilla.redhat.com/show_bug.cgi?id=2173403
https://bugzilla.redhat.com/show_bug.cgi?id=2173430
https://bugzilla.redhat.com/show_bug.cgi?id=2173434
https://bugzilla.redhat.com/show_bug.cgi?id=2173444
https://bugzilla.redhat.com/show_bug.cgi?id=2174400
https://bugzilla.redhat.com/show_bug.cgi?id=2175903
https://bugzilla.redhat.com/show_bug.cgi?id=2176140
https://bugzilla.redhat.com/show_bug.cgi?id=2177371
https://bugzilla.redhat.com/show_bug.cgi?id=2177389
https://bugzilla.redhat.com/show_bug.cgi?id=2181330
https://bugzilla.redhat.com/show_bug.cgi?id=2182443
https://bugzilla.redhat.com/show_bug.cgi?id=2184578
https://bugzilla.redhat.com/show_bug.cgi?id=2185945
https://bugzilla.redhat.com/show_bug.cgi?id=2187257
https://bugzilla.redhat.com/show_bug.cgi?id=2188468
https://bugzilla.redhat.com/show_bug.cgi?id=2192667
https://bugzilla.redhat.com/show_bug.cgi?id=2192671
https://bugzilla.redhat.com/show_bug.cgi?id=2193097
https://bugzilla.redhat.com/show_bug.cgi?id=2193219
https://bugzilla.redhat.com/show_bug.cgi?id=2213139
https://bugzilla.redhat.com/show_bug.cgi?id=2213199
https://bugzilla.redhat.com/show_bug.cgi?id=2213485
https://bugzilla.redhat.com/show_bug.cgi?id=2213802
https://bugzilla.redhat.com/show_bug.cgi?id=2214348
https://bugzilla.redhat.com/show_bug.cgi?id=2215502
https://bugzilla.redhat.com/show_bug.cgi?id=2215835
https://bugzilla.redhat.com/show_bug.cgi?id=2215836
https://bugzilla.redhat.com/show_bug.cgi?id=2215837
https://bugzilla.redhat.com/show_bug.cgi?id=2218195
https://bugzilla.redhat.com/show_bug.cgi?id=2218212
https://bugzilla.redhat.com/show_bug.cgi?id=2218943
https://bugzilla.redhat.com/show_bug.cgi?id=2219530
https://bugzilla.redhat.com/show_bug.cgi?id=2221707
https://bugzilla.redhat.com/show_bug.cgi?id=2223949
https://bugzilla.redhat.com/show_bug.cgi?id=2225191
https://bugzilla.redhat.com/show_bug.cgi?id=2225201
https://bugzilla.redhat.com/show_bug.cgi?id=2225511
https://bugzilla.redhat.com/show_bug.cgi?id=2236982