Important: kernel-rt security update

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: bpf: Incorrect verifier pruning leads to unsafe code paths being incorrectly marked as safe (CVE-2023-2163)
• kernel: tun: bugs for oversize packet when napi frags enabled in tun_napi_alloc_frags (CVE-2023-3812)
• kernel: use after free in nvmet_tcp_free_crypto in NVMe (CVE-2023-5178)
• kernel: use-after-free due to race condition occurring in dvb_register_device() (CVE-2022-45884)
• kernel: use-after-free due to race condition occurring in dvb_net.c (CVE-2022-45886)
• kernel: use-after-free due to race condition occurring in dvb_ca_en50221.c (CVE-2022-45919)
• kernel: use-after-free in smb2_is_status_io_timeout() (CVE-2023-1192)

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 - 2148510 - CVE-2022-45884 kernel: use-after-free due to race condition occurring in dvb_register_device()
• BZ - 2148517 - CVE-2022-45886 kernel: use-after-free due to race condition occurring in dvb_net.c
• BZ - 2151956 - CVE-2022-45919 kernel: use-after-free due to race condition occurring in dvb_ca_en50221.c
• BZ - 2154178 - CVE-2023-1192 kernel: use-after-free in smb2_is_status_io_timeout()
• BZ - 2224048 - CVE-2023-3812 kernel: tun: bugs for oversize packet when napi frags enabled in tun_napi_alloc_frags
• BZ - 2240249 - CVE-2023-2163 kernel: bpf: Incorrect verifier pruning leads to unsafe code paths being incorrectly marked as safe
• BZ - 2241924 - CVE-2023-5178 kernel: use after free in nvmet_tcp_free_crypto in NVMe

CVEs

• CVE-2022-45884
• CVE-2022-45886
• CVE-2022-45919
• CVE-2023-1192
• CVE-2023-2163
• CVE-2023-3812
• CVE-2023-5178

References

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