Red Hat Product Errata RHSA-2026:23258 - Security Advisory Issued: 2026-06-04 Updated: 2026-06-04 RHSA-2026:23258 - 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 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 packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions (CVE-2026-46243) 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 x86_64 8 x86_64 Red Hat Enterprise Linux for IBM z Systems 8 s390x Red Hat Enterprise Linux for Power, little endian 8 ppc64le Red Hat Enterprise Linux for ARM 64 8 aarch64 Red Hat CodeReady Linux Builder for x86_64 8 x86_64 Red Hat CodeReady Linux Builder for Power, little endian 8 ppc64le Red Hat CodeReady Linux Builder for ARM 64 8 aarch64 Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 8.10 x86_64 Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 8.10 aarch64 Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 8.10 ppc64le Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 8.10 s390x Fixes BZ - 2481486 - CVE-2026-46243 kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions CVEs CVE-2026-46243 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. Red Hat Enterprise Linux for x86_64 8 SRPM kernel-4.18.0-553.129.1.el8_10.src.rpm SHA-256: 7165d2c67e504425cbfc92333e4c796e77b9e5463de76172fa350d0859cad414 x86_64 bpftool-4.18.0-553.129.1.el8_10.x86_64.rpm SHA-256: 4e709e804d17f15327fcf954f005bed6050ae00ac52960ac820c54bcb527b9dc bpftool-debuginfo-4.18.0-553.129.1.el8_10.x86_64.rpm SHA-256: d62ae66bdd1cc0c524fc044f12003adbc53792dd1d39a2bddc10a739fec27d85 kernel-4.18.0-553.129.1.el8_10.x86_64.rpm SHA-256: cf6fa8d81ec31dad3bfae1440bb9118799d032aa10cf67675446123797d2101c kernel-abi-stablelists-4.18.0-553.129.1.el8_10.noarch.rpm SHA-256: 27d4d17ebe5933b88afc55d96351e07a926dbdf3ee2a01bd5a799cc6d12e8302 kernel-core-4.18.0-553.129.1.el8_10.x86_64.rpm SHA-256: 965ffb4fe6610003b59229fd026809ee335b4e2314e5517d2270c359672afabe kernel-cross-headers-4.18.0-553.129.1.el8_10.x86_64.rpm SHA-256: e3a7075a4e5bc9171be8cb4819275a00d5dd5e6003c33f694ab3a1b96a224fcf kernel-debug-4.18.0-553.129.1.el8_10.x86_64.rpm SHA-256: 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kernel-devel-4.18.0-553.129.1.el8_10.x86_64.rpm SHA-256: 81c98771ff79ec6b8ce10639d22c4c5ce2de663ad8702d220315a8178ad17fdd kernel-doc-4.18.0-553.129.1.el8_10.noarch.rpm SHA-256: fc2ac2ecbb00cd608d07079afe7295410121af3eb2c3270fd5cdf4b121b9953c kernel-headers-4.18.0-553.129.1.el8_10.x86_64.rpm SHA-256: e440f07aec313cb9b628ac964d06945e3173b34693bb51679adbd75fb8c7e847 kernel-modules-4.18.0-553.129.1.el8_10.x86_64.rpm SHA-256: 89673b49847ff75084c5de46dd0fee9263fc296510b828624cd5c161e05c8c41 kernel-modules-extra-4.18.0-553.129.1.el8_10.x86_64.rpm SHA-256: 5f36d660121c80dfccba3a5ed6d728eba5c14c293f0e43dbfdf988647669ec8d kernel-tools-4.18.0-553.129.1.el8_10.x86_64.rpm SHA-256: 6f35767e565a2a746fdc2f18467668b391e67c75c457cef9f6a9f830405258b5 kernel-tools-debuginfo-4.18.0-553.129.1.el8_10.x86_64.rpm SHA-256: 565d5e5aed2f6e1ed335485a2e1ac85f03d9084a0322b48cbefabddafd736c93 kernel-tools-libs-4.18.0-553.129.1.el8_10.x86_64.rpm SHA-256: 337ef582b39262a2a0d671dd14f73f5c36c644c040ec24a4922517985da92113 perf-4.18.0-553.129.1.el8_10.x86_64.rpm SHA-256: 7ad9dc5d4c8718b5691558ef8e65ba7705acbc2d69b1cfd855d9f1a0a3b0951b perf-debuginfo-4.18.0-553.129.1.el8_10.x86_64.rpm SHA-256: d43a28499ae38ce765a488b8cecf3ff5adbc21883e53a7264c06879f2b6457cb python3-perf-4.18.0-553.129.1.el8_10.x86_64.rpm SHA-256: 9ccb2afb9280896b0486b62842439d2f896dab309f35b97e49f503f2d404695b python3-perf-debuginfo-4.18.0-553.129.1.el8_10.x86_64.rpm SHA-256: ec4399853904dfd97cbec2f100fc816f5c1978556c7dbb98cc4c0236d061ff6d Red Hat Enterprise Linux for IBM z Systems 8 SRPM kernel-4.18.0-553.129.1.el8_10.src.rpm SHA-256: 7165d2c67e504425cbfc92333e4c796e77b9e5463de76172fa350d0859cad414 s390x bpftool-4.18.0-553.129.1.el8_10.s390x.rpm SHA-256: 9667fb5064be0509317c5ea1b10a573a608b82be626238f9cf71133e8b4a13eb bpftool-debuginfo-4.18.0-553.129.1.el8_10.s390x.rpm SHA-256: d3f47ac6e3ab6e064a8599b1df0cf6d0900c5a658d6585ae051b4090175052be kernel-4.18.0-553.129.1.el8_10.s390x.rpm SHA-256: 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