This Important Red Hat kernel-rt update addresses two high-severity vulnerabilities: CVE-2026-46117 (CVSS 7.8), a user-triggerable WARN_ON() in the RDMA mana driver, and CVE-2026-53071 (CVSS 8.8), a missing lock in the Bluetooth L2CAP implementation. For CVE-2026-46117, the authoritative NVD data indicates affected Linux kernel versions are 6.8 through 6.12.90, 6.13 through 6.18.29, and 6.19 through 7.0.6, with fixes available in kernel versions 6.12.91, 6.18.30, and 7.0.7. The advisory requires a system reboot after applying the update.
Red Hat Product Errata RHSA-2026:42550 - Security Advisory Issued: 2026-07-21 Updated: 2026-07-21 RHSA-2026:42550 - Security Advisory Overview Updated Packages Synopsis Important: kernel-rt security, bug fix, and enhancement 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: RDMA/mana: Remove user triggerable WARN_ON() in mana_ib_create_qp_rss() (CVE-2026-46117) kernel: Bluetooth: l2cap: Add missing chan lock in l2cap_ecred_reconf_rsp (CVE-2026-53071) Bug Fix(es) and Enhancement(s): [rhel-8] WARNING: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected - at: vmd_pci_write+0x85/0xe0 - deadlock (JIRA:RHEL-174916) 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 - 2482576 - CVE-2026-46117 kernel: RDMA/mana: Remove user triggerable WARN_ON() in mana_ib_create_qp_rss() BZ - 2492458 - CVE-2026-53071 kernel: Bluetooth: l2cap: Add missing chan lock in l2cap_ecred_reconf_rsp CVEs CVE-2026-46117 CVE-2026-53071 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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