(RHSA-2023:6901) Important: kernel-rt security, bug fix, and enhancement update

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.