RHSA-2024:0881 - Security Advisory

Topic

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: net/sched: sch_hfsc UAF (CVE-2023-4623)
• kernel: use-after-free in sch_qfq network scheduler (CVE-2023-4921)
• kernel: inactive elements in nft_pipapo_walk (CVE-2023-6817)
• kernel: IGB driver inadequate buffer size for frames larger than MTU (CVE-2023-45871)
• kernel: ktls overwrites readonly memory pages when using function splice with a ktls socket as destination (CVE-2024-0646)
• kernel: nfp: use-after-free in area_cache_get() (CVE-2022-3545)
• kernel: null-ptr-deref vulnerabilities in sl_tx_timeout in drivers/net/slip (CVE-2022-41858)
• kernel: HID: check empty report_list in hid_validate_values() (CVE-2023-1073)
• kernel: Possible use-after-free since the two fdget() during vhost_net_set_backend() (CVE-2023-1838)
• kernel: NULL pointer dereference in can_rcv_filter (CVE-2023-2166)
• kernel: Slab-out-of-bound read in compare_netdev_and_ip (CVE-2023-2176)
• kernel: A heap out-of-bounds write when function perf_read_group is called and sibling_list is smaller than its child's sibling_list (CVE-2023-5717)
• kernel: NULL pointer dereference in nvmet_tcp_build_iovec (CVE-2023-6356)
• kernel: NULL pointer dereference in nvmet_tcp_execute_request (CVE-2023-6535)
• kernel: NULL pointer dereference in __nvmet_req_complete (CVE-2023-6536)
• kernel: Out-Of-Bounds Read vulnerability in smbCalcSize (CVE-2023-6606)
• kernel: OOB Access in smb2_dump_detail (CVE-2023-6610)
• kernel: use-after-free in l2cap_sock_release in net/bluetooth/l2cap_sock.c (CVE-2023-40283)
• kernel: SEV-ES local priv escalation (CVE-2023-46813)

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 for Real Time 8 x86_64
• Red Hat Enterprise Linux for Real Time for NFV 8 x86_64

Fixes

• BZ - 2087568 - CVE-2023-1838 kernel: Possible use-after-free since the two fdget() during vhost_net_set_backend()
• BZ - 2144379 - CVE-2022-41858 kernel: null-ptr-deref vulnerabilities in sl_tx_timeout in drivers/net/slip
• BZ - 2161310 - CVE-2022-3545 kernel: nfp: use-after-free in area_cache_get()
• BZ - 2173403 - CVE-2023-1073 kernel: HID: check empty report_list in hid_validate_values()
• BZ - 2187813 - CVE-2023-2166 kernel: NULL pointer dereference in can_rcv_filter
• BZ - 2187931 - CVE-2023-2176 kernel: Slab-out-of-bound read in compare_netdev_and_ip
• BZ - 2231800 - CVE-2023-40283 kernel: use-after-free in l2cap_sock_release in net/bluetooth/l2cap_sock.c
• BZ - 2237757 - CVE-2023-4623 kernel: net/sched: sch_hfsc UAF
• BZ - 2244723 - CVE-2023-45871 kernel: IGB driver inadequate buffer size for frames larger than MTU
• BZ - 2245514 - CVE-2023-4921 kernel: use-after-free in sch_qfq network scheduler
• BZ - 2246944 - CVE-2023-46813 kernel: SEV-ES local priv escalation
• BZ - 2246945 - CVE-2023-5717 kernel: A heap out-of-bounds write when function perf_read_group is called and sibling_list is smaller than its child's sibling_list
• BZ - 2253611 - CVE-2023-6606 kernel: Out-Of-Bounds Read vulnerability in smbCalcSize
• BZ - 2253614 - CVE-2023-6610 kernel: OOB Access in smb2_dump_detail
• BZ - 2253908 - CVE-2024-0646 kernel: ktls overwrites readonly memory pages when using function splice with a ktls socket as destination
• BZ - 2254052 - CVE-2023-6536 kernel: NULL pointer dereference in __nvmet_req_complete
• BZ - 2254053 - CVE-2023-6535 kernel: NULL pointer dereference in nvmet_tcp_execute_request
• BZ - 2254054 - CVE-2023-6356 kernel: NULL pointer dereference in nvmet_tcp_build_iovec
• BZ - 2255139 - CVE-2023-6817 kernel: inactive elements in nft_pipapo_walk

CVEs

• CVE-2022-3545
• CVE-2022-41858
• CVE-2023-1073
• CVE-2023-1838
• CVE-2023-2166
• CVE-2023-2176
• CVE-2023-4623
• CVE-2023-4921
• CVE-2023-5717
• CVE-2023-6356
• CVE-2023-6535
• CVE-2023-6536
• CVE-2023-6606
• CVE-2023-6610
• CVE-2023-6817
• CVE-2023-40283
• CVE-2023-45871
• CVE-2023-46813
• CVE-2024-0646

References

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