This Red Hat kernel security update addresses multiple vulnerabilities rated Important, including use-after-free flaws in Bluetooth MGMT (CVE-2025-39981), the bonding module (CVE-2026-23171), and nf_tables (CVE-2026-23231) that can lead to privilege escalation, denial of service, or arbitrary code execution, alongside other denial-of-service flaws in hugetlb folio migration (CVE-2026-23097, CVSS 5.5) and rxrpc_recvmsg. Affected kernel versions include Linux 5.9.9 through 5.10.248, 5.10.1 through 5.10.248, 5.11 through 5.15.198, 5.16 through 6.1.161, and 6.2 through 6.6.121, with fixes provided in versions 5.10.249, 5.15.199, 6.1.162, 6.6.122, and subsequent stable releases. A system reboot is required after applying the update.
Red Hat Product Errata RHSA-2026:10108 - Security Advisory Issued: 2026-04-23 Updated: 2026-04-23 RHSA-2026:10108 - 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 9.4 Extended Update Support. 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: Bluetooth: MGMT: Fix possible UAFs (CVE-2025-39981) kernel: mlxsw: spectrum_mr: Fix use-after-free when updating multicast route stats (CVE-2025-68800) kernel: Linux kernel: Denial of Service due to a deadlock in hugetlb folio migration (CVE-2026-23097) kernel: Linux kernel: Denial of Service via unsafe requeue in rxrpc_recvmsg (CVE-2026-23066) kernel: Kernel: Privilege escalation or denial of service in nf_tables via inverted element activity check (CVE-2026-23111) kernel: Linux kernel: Local denial of service and memory leak in DAMON sysfs via setup failure (CVE-2026-23144) kernel: Linux kernel: Use-after-free in bonding module can cause system crash or arbitrary code execution (CVE-2026-23171) kernel: scsi: target: iscsi: Fix use-after-free in iscsit_dec_session_usage_count() (CVE-2026-23193) kernel: net/sched: cls_u32: use skb_header_pointer_careful() (CVE-2026-23204) kernel: kernel: Privilege escalation or denial of service via use-after-free in nf_tables_addchain() (CVE-2026-23231) kernel: nfsd: fix heap overflow in NFSv4.0 LOCK replay cache (CVE-2026-31402) 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 - Extended Update Support 9.4 x86_64 Red Hat Enterprise Linux Server - AUS 9.4 x86_64 Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 9.4 s390x Red Hat Enterprise Linux for Power, little endian - Extended Update Support 9.4 ppc64le Red Hat Enterprise Linux for ARM 64 - Extended Update Support 9.4 aarch64 Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.4 ppc64le Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.4 x86_64 Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support 9.4 x86_64 Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support 9.4 ppc64le Red Hat CodeReady Linux Builder for IBM z Systems - Extended Update Support 9.4 s390x Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support 9.4 aarch64 Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.4 aarch64 Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.4 s390x Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 9.4 x86_64 Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 9.4 aarch64 Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 9.4 ppc64le Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 9.4 s390x Fixes BZ - 2404105 - CVE-2025-39981 kernel: Bluetooth: MGMT: Fix possible UAFs BZ - 2429065 - CVE-2025-68800 kernel: mlxsw: spectrum_mr: Fix use-after-free when updating multicast route stats BZ - 2436802 - CVE-2026-23097 kernel: Linux kernel: Denial of Service due to a deadlock in hugetlb folio migration BZ - 2436805 - CVE-2026-23066 kernel: Linux kernel: Denial of Service via unsafe requeue in rxrpc_recvmsg BZ - 2439687 - CVE-2026-23111 kernel: Kernel: Privilege escalation or denial of service in nf_tables via inverted element activity check BZ - 2439872 - CVE-2026-23144 kernel: Linux kernel: Local denial of service and memory leak in DAMON sysfs via setup failure BZ - 2439886 - CVE-2026-23171 kernel: Linux kernel: Use-after-free in bonding module can cause system crash or arbitrary code execution BZ - 2439887 - CVE-2026-23193 kernel: scsi: target: iscsi: Fix use-after-free in iscsit_dec_session_usage_count() BZ - 2439931 - CVE-2026-23204 kernel: net/sched: cls_u32: use skb_header_pointer_careful() BZ - 2444376 - CVE-2026-23231 kernel: kernel: Privilege escalation or denial of service via use-after-free in nf_tables_addchain() BZ - 2454844 - CVE-2026-31402 kernel: nfsd: fix heap overflow in NFSv4.0 LOCK replay cache CVEs CVE-2025-39981 CVE-2025-68800 CVE-2026-23066 CVE-2026-23097 CVE-2026-23111 CVE-2026-23144 CVE-2026-23171 CVE-2026-23193 CVE-2026-23204 CVE-2026-23231 CVE-2026-31402 References https://access.redhat.com/security/updates/classification/#important Note: More recent versions of these packages may be available. 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