A critical use-after-free vulnerability (CVE-2026-53006, CVSS 9.8) in the Linux kernel's IPv6 ICMPv6 handling allows for potential remote code execution. The vulnerability affects a wide range of kernel versions, specifically Linux kernels from 4.4 to 5.10.257, 5.11 to 5.15.208, 5.16 to 6.1.174, 6.2 to 6.6.140, and 6.7 to 6.12.90. Patches are available in kernel versions 5.10.258, 5.15.209, 6.1.175, 6.6.141, 6.12.91, 6.18.33, and 7.0.10, with Red Hat providing the fix in kernel-rt packages for RHEL 8 via update RHSA-2026:47010, which requires a system reboot.
Red Hat Product Errata RHSA-2026:47010 - Security Advisory Issued: 2026-07-28 Updated: 2026-07-28 RHSA-2026:47010 - Security Advisory Overview Updated Packages Synopsis Important: kernel-rt 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-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: ipv6: fix possible UAF in icmpv6_rcv() (CVE-2026-53006) 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 Real Time 8 x86_64 Red Hat Enterprise Linux for Real Time for NFV 8 x86_64 Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 8.10 x86_64 Fixes BZ - 2492363 - CVE-2026-53006 kernel: ipv6: fix possible UAF in icmpv6_rcv() CVEs CVE-2026-53006 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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