A vulnerability (CVE-2026-43499, CVSS 7.8 HIGH) in the Linux kernel's rtmutex subsystem could allow for potential security impacts. Affected versions include Linux kernel 2.6.39 through 6.1.174, 6.2 through 6.6.139, 6.7 through 6.12.85, 6.13 through 6.18.26, and 6.19 through 7.0.3. The fix is applied in kernel versions 6.1.175, 6.6.140, 6.12.86, 6.18.27, and 7.0.4, and Red Hat has released patched packages for RHEL 6 ELS requiring a system reboot.
Red Hat Product Errata RHSA-2026:41920 - Security Advisory Issued: 2026-07-20 Updated: 2026-07-20 RHSA-2026:41920 - 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 6 Extended Lifecycle Support - EXTENSION. 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: rtmutex: Use waiter::task instead of current in remove_waiter() (CVE-2026-43499) 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 - 2480453 - CVE-2026-43499 kernel: rtmutex: Use waiter::task instead of current in remove_waiter() CVEs CVE-2026-43499 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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