A critical kernel security update addresses two vulnerabilities: CVE-2026-43037 in the ip6_tunnel module and CVE-2026-46243 (CVSS 7.1 High) in the SMB client which could allow userspace cifs.spnego descriptions. The SMB client vulnerability affects Linux kernel versions from 2.6.24.1 through 5.10.257, 5.11 through 5.15.208, 5.16 through 6.1.174, 6.2 through 6.6.141, and 6.7 through 6.12.91, with fixes available in versions 5.10.258, 5.15.209, 6.1.175, 6.6.142, 6.12.92, and 6.18.34. A system reboot is required after applying the update.
Red Hat Product Errata RHSA-2026:27719 - Security Advisory Issued: 2026-06-22 Updated: 2026-06-22 RHSA-2026:27719 - Security Advisory Overview Updated Packages Synopsis Critical: kernel security update Type/Severity Security Advisory: Critical 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 6 Extended Lifecycle Support - EXTENSION. Red Hat Product Security has rated this update as having a security impact of Critical. 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: ip6_tunnel: clear skb2->cb[] in ip4ip6_err() (CVE-2026-43037) 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 Server - Extended Life Cycle Support Extension 6 x86_64 Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 i386 Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension (for IBM z Systems) 6 s390x Fixes BZ - 2464351 - CVE-2026-43037 kernel: ip6_tunnel: clear skb2->cb[] in ip4ip6_err() BZ - 2481486 - CVE-2026-46243 kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions CVEs CVE-2026-43037 CVE-2026-46243 References https://access.redhat.com/security/updates/classification/#critical Note: More recent versions of these packages may be available. Click a package name for more details. 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SHA-256: 8399e22c501872398dfaacfbf15b3f5d5f390a2d4ed562f79247b88d56a21009 kernel-doc-2.6.32-754.61.1.el6.noarch.rpm SHA-256: 9c3412e3f95e7a3a8ecdd254ce69e56bb2780aea0a683ea84efc164fa8b45e26 kernel-firmware-2.6.32-754.61.1.el6.noarch.rpm SHA-256: 875a6ce4dd3717c72b377039ac951c47e41cf30cd8888d278521d167c6a7d45e kernel-headers-2.6.32-754.61.1.el6.x86_64.rpm SHA-256: 6986b658eff968b3694c4fa2bfc140a344c2680556565953fa15c7bdb94c3684 perf-2.6.32-754.61.1.el6.x86_64.rpm SHA-256: e50b4d33919b7bafca681b28efc81e7850db0d6871177eef9d9547e40938f5f6 perf-debuginfo-2.6.32-754.61.1.el6.i686.rpm SHA-256: fcf05023fc8fe67f91388337630a1defb34134b0303601483f47516d738139fa perf-debuginfo-2.6.32-754.61.1.el6.x86_64.rpm SHA-256: caed18487495cea231dfce6e06d9c18f6f99030ff1300982821695bcc8d3beee perf-debuginfo-2.6.32-754.61.1.el6.x86_64.rpm SHA-256: caed18487495cea231dfce6e06d9c18f6f99030ff1300982821695bcc8d3beee python-perf-2.6.32-754.61.1.el6.x86_64.rpm SHA-256: 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