RHSA-2023:5255 - 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: bluetooth: Unauthorized management command execution (CVE-2023-2002)
• kernel: UAF in nftables when nft_set_lookup_global triggered after handling

named and anonymous sets in batch requests (CVE-2023-3390)

• kernel: cls_flower: out-of-bounds write in fl_set_geneve_opt()

(CVE-2023-35788)

• hw: amd: Cross-Process Information Leak (CVE-2023-20593,zenbleed)
• kernel: ipvlan: out-of-bounds write caused by unclear skb->cb (CVE-2023-3090)
• kernel: nf_tables: stack-out-of-bounds-read in nft_byteorder_eval()

(CVE-2023-35001,ZDI-CAN-20721)

• kernel: net/sched: cls_fw component can be exploited as result of failure in

tcf_change_indev function (CVE-2023-3776)

• kernel: netfilter: use-after-free due to improper element removal in

nft_pipapo_remove() (CVE-2023-4004)

Bug Fix(es):

• kernel-rt: update RT source tree to the RHEL-8.8.z3 source tree (BZ#2227068)
• pods get restarted due to failed probes (BZ#2227238)

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
• Red Hat Enterprise Linux for Real Time - Telecommunications Update Service 8.8 x86_64
• Red Hat Enterprise Linux for Real Time for NFV - Telecommunications Update Service 8.8 x86_64

Fixes

• BZ - 2187308 - CVE-2023-2002 Kernel: bluetooth: Unauthorized management command execution
• BZ - 2213260 - CVE-2023-3390 kernel: UAF in nftables when nft_set_lookup_global triggered after handling named and anonymous sets in batch requests
• BZ - 2215768 - CVE-2023-35788 kernel: cls_flower: out-of-bounds write in fl_set_geneve_opt()
• BZ - 2217845 - CVE-2023-20593 hw: amd: Cross-Process Information Leak
• BZ - 2218672 - CVE-2023-3090 kernel: ipvlan: out-of-bounds write caused by unclear skb->cb
• BZ - 2220892 - CVE-2023-35001 kernel: nf_tables: stack-out-of-bounds-read in nft_byteorder_eval()
• BZ - 2225097 - CVE-2023-3776 kernel: net/sched: cls_fw component can be exploited as result of failure in tcf_change_indev function
• BZ - 2225275 - CVE-2023-4004 kernel: netfilter: use-after-free due to improper element removal in nft_pipapo_remove()

CVEs

• CVE-2023-1637
• CVE-2023-2002
• CVE-2023-3090
• CVE-2023-3390
• CVE-2023-3776
• CVE-2023-4004
• CVE-2023-20593
• CVE-2023-35001
• CVE-2023-35788

References

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