Red Hat Security Advisory

RHSA-2026:9643

kernel security update

Released 2026-04-22 · Red Hat rating Moderate · View on Red Hat →

Fixed in

Red Hat Enterprise Linux BaseOS AUS (v.8.4) bpftool-4.18.0-305.189.1.el8_4, kernel-4.18.0-305.189.1.el8_4, kernel-abi-stablelists-4.18.0-305.189.1.el8_4 +14
Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) bpftool-4.18.0-305.189.1.el8_4, kernel-4.18.0-305.189.1.el8_4, kernel-abi-stablelists-4.18.0-305.189.1.el8_4 +14

Fixes 4 records

TI-2026-18668 CVE-2026-23231 · GHSA-gxm6-px42-mpjc

netfilter: nf_tables: fix use-after-free in nf_tables_addchain()

LOW 38

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: fix use-after-free in nf_tables_addchain() nf_tables_addchain() publishes the chain to table->chains via list_add_tail_rcu() (in n…

CVSS 3.1HIGH 7.8 Local Low privileges No interaction EPSS 0.01045 Published 2026-03-04 Partial fix · 6.1.165, 6.6.128 +4 CWE-416

TI-2025-26838 CVE-2025-40168 · GHSA-9cp7-m95w-q87h

smc: Use __sk_dst_get() and dst_dev_rcu() in smc_clc_prfx_match().

LOW 36

In the Linux kernel, the following vulnerability has been resolved: smc: Use __sk_dst_get() and dst_dev_rcu() in smc_clc_prfx_match().

CVSS 3.1HIGH 8.1 Network No auth No interaction EPSS 0.0042 Published 2025-11-12 Partial fix · 6.1.187, 6.6.156 +3

TI-2025-26736 CVE-2025-40064 · GHSA-c442-5cxr-p4xq

smc: Fix use-after-free in __pnet_find_base_ndev().

LOW 33

In the Linux kernel, the following vulnerability has been resolved: smc: Fix use-after-free in __pnet_find_base_ndev().

CVSS 3.1HIGH 7.8 Local Low privileges No interaction EPSS 0.0015 Published 2025-10-28 Partial fix · 6.1.187, 6.6.156 +3

TI-2026-18641 CVE-2026-23204 · GHSA-rf63-9f5h-hhg6

net/sched: cls_u32: use skb_header_pointer_careful()

LOW 30

In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_u32: use skb_header_pointer_careful() skb_header_pointer() does not fully validate negative @offset values.

CVSS 3.1HIGH 7.1 Local Low privileges No interaction EPSS 0.00152 Published 2026-02-14 Partial fix · 5.10.260, 5.15.209 +5 CWE-125