RHSA-2023:7389 - Security Advisory

Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 9.0 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-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: cls_fw component can be exploited as result of failure in tcf_change_indev function (CVE-2023-3776)
• kernel: tun: bugs for oversize packet when napi frags enabled in tun_napi_alloc_frags (CVE-2023-3812)
• kernel: netfilter: use-after-free due to improper element removal in nft_pipapo_remove() (CVE-2023-4004)
• kernel: netfilter: nf_tables_newrule when adding a rule with NFTA_RULE_CHAIN_ID leads to use-after-free (CVE-2023-4147)
• kernel: netfilter: potential slab-out-of-bound access due to integer underflow (CVE-2023-42753)
• kernel: use-after-free due to race condition in qdisc_graft() (CVE-2023-0590)
• hw: amd: Cross-Process Information Leak (CVE-2023-20593)

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 for x86_64 - 4 years of updates 9.0 x86_64
• Red Hat Enterprise Linux for Real Time for NFV for x86_64 - 4 years of updates 9.0 x86_64

Fixes

• BZ - 2165741 - CVE-2023-0590 kernel: use-after-free due to race condition in qdisc_graft()
• BZ - 2217845 - CVE-2023-20593 hw: amd: Cross-Process Information Leak
• BZ - 2224048 - CVE-2023-3812 kernel: tun: bugs for oversize packet when napi frags enabled in tun_napi_alloc_frags
• BZ - 2225097 - CVE-2023-3776 kernel: net/sched: cls_fw component can be exploited as result of failure in tcf_change_indev function
• BZ - 2225239 - CVE-2023-4147 kernel: netfilter: nf_tables_newrule when adding a rule with NFTA_RULE_CHAIN_ID leads to use-after-free
• BZ - 2225275 - CVE-2023-4004 kernel: netfilter: use-after-free due to improper element removal in nft_pipapo_remove()
• BZ - 2239843 - CVE-2023-42753 kernel: netfilter: potential slab-out-of-bound access due to integer underflow

CVEs

• CVE-2023-0590
• CVE-2023-3776
• CVE-2023-3812
• CVE-2023-4004
• CVE-2023-4147
• CVE-2023-20593
• CVE-2023-42753

References

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