This Red Hat kernel security update addresses four vulnerabilities, including CVE-2026-43198, a critical race condition in TCP/IPv6 connection handling with a CVSS score of 9.8. Affected Linux kernel versions are broadly from 2.6.12.1 up to 6.18.15 and from 6.19 to 6.19.5, with fixes provided in kernel versions 6.18.16 and 6.19.6 respectively. The advisory rates the overall update as Important and requires a system reboot after applying the patch via the Red Hat customer portal.
Red Hat Product Errata RHSA-2026:34443 - Security Advisory Issued: 2026-07-01 Updated: 2026-07-01 RHSA-2026:34443 - Security Advisory Overview Updated Packages Synopsis Important: kernel security update Type/Severity Security Advisory: Important Red Hat Lightspeed patch analysis Identify and remediate systems affected by this advisory. View affected systems Topic An update for kernel is now available for Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions. 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 packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): kernel: tcp: fix potential race in tcp_v6_syn_recv_sock() (CVE-2026-43198) kernel: ALSA: aloop: Fix peer runtime UAF during format-change stop (CVE-2026-46090) kernel: RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event() (CVE-2026-46181) kernel: netfilter: nft_inner: Fix IPv6 inner_thoff desync (CVE-2026-46244) 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 Server - AUS 9.4 x86_64 Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.4 ppc64le Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.4 x86_64 Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.4 aarch64 Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.4 s390x Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 9.4 x86_64 Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 9.4 aarch64 Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 9.4 ppc64le Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 9.4 s390x Fixes BZ - 2467228 - CVE-2026-43198 kernel: tcp: fix potential race in tcp_v6_syn_recv_sock() BZ - 2481980 - CVE-2026-46090 kernel: ALSA: aloop: Fix peer runtime UAF during format-change stop BZ - 2482532 - CVE-2026-46181 kernel: RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event() BZ - 2484451 - CVE-2026-46244 kernel: netfilter: nft_inner: Fix IPv6 inner_thoff desync CVEs CVE-2026-43198 CVE-2026-46090 CVE-2026-46181 CVE-2026-46244 References https://access.redhat.com/security/updates/classification/#important Note: More recent versions of these packages may be available. Click a package name for more details. 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