ESB-2026.4106

=========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2026.4106 kernel security update 23 April 2026 =========================================================================== AUSCERT Security Bulletin Summary --------------------------------- Product: kernel Publisher: Red Hat Operating System: Red Hat Resolution: Patch/Upgrade CVE Names: CVE-2026-23216 CVE-2025-71238 CVE-2025-38024 CVE-2023-53539 CVE-2025-38180 CVE-2026-23193 CVE-2026-23231 CVE-2022-50053 CVE-2026-23204 Original Bulletin: https://access.redhat.com/errata/RHSA-2026:9870 Comment: CVSS (Max): 7.5 CVE-2026-23231 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H) CVSS Source: Red Hat Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H EPSS (Max): 0.1% (24th) CVE-2025-38024 2026-04-22 - --------------------------BEGIN INCLUDED TEXT-------------------- RHSA-2026:9870 - Security Advisory Issued: 2026-04-22 Updated: 2026-04-22 Synopsis Kernel security update Type/Severity Security Advisory: Moderate Topic An update for kernel is now available for Red Hat Enterprise Linux 7 Extended Lifecycle Support. Red Hat Product Security has rated this update as having a security impact of Moderate. 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): o kernel: Linux kernel: RDMA/rxe use-after-free vulnerability leading to potential arbitrary code execution (CVE-2025-38024) o kernel: iavf: Fix reset error handling (CVE-2022-50053) o kernel: Linux kernel: Use-After-Free vulnerability in ATM subsystem (CVE-2025-38180) o kernel: RDMA/rxe: Fix incomplete state save in rxe_requester (CVE-2023-53539) o kernel: scsi: target: iscsi: Fix use-after-free in iscsit_dec_session_usage_count() (CVE-2026-23193) o kernel: net/sched: cls_u32: use skb_header_pointer_careful() (CVE-2026-23204) o kernel: scsi: target: iscsi: Fix use-after-free in iscsit_dec_conn_usage_count() (CVE-2026-23216) o kernel: kernel: Privilege escalation or denial of service via use-after-free in nf_tables_addchain() (CVE-2026-23231) o kernel: Linux kernel (qla2xxx): Double free vulnerability leads to denial of service and potential privilege escalation. (CVE-2025-71238) 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 o Red Hat Enterprise Linux Server - Extended Life Cycle Support 7 x86_64 o Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 7 s390x o Red Hat Enterprise Linux Server - Extended Life Cycle Support for IBM Power, big endian 7 ppc64 o Red Hat Enterprise Linux Server - Extended Life Cycle Support for IBM Power, little endian 7 ppc64le Fixes o BZ - 2373354 - CVE-2025-38024 kernel: Linux kernel: RDMA/rxe use-after-free vulnerability leading to potential arbitrary code execution o BZ - 2373553 - CVE-2022-50053 kernel: iavf: Fix reset error handling o BZ - 2376376 - CVE-2025-38180 kernel: Linux kernel: Use-After-Free vulnerability in ATM subsystem o BZ - 2401510 - CVE-2023-53539 kernel: RDMA/rxe: Fix incomplete state save in rxe_requester o BZ - 2439887 - CVE-2026-23193 kernel: scsi: target: iscsi: Fix use-after-free in iscsit_dec_session_usage_count() o BZ - 2439931 - CVE-2026-23204 kernel: net/sched: cls_u32: use skb_header_pointer_careful() o BZ - 2440630 - CVE-2026-23216 kernel: scsi: target: iscsi: Fix use-after-free in iscsit_dec_conn_usage_count() o BZ - 2444376 - CVE-2026-23231 kernel: kernel: Privilege escalation or denial of service via use-after-free in nf_tables_addchain() o BZ - 2444398 - CVE-2025-71238 kernel: Linux kernel (qla2xxx): Double free vulnerability leads to denial of service and potential privilege escalation. CVEs o CVE-2022-50053 o CVE-2023-53539 o CVE-2025-38024 o CVE-2025-38180 o CVE-2025-71238 o CVE-2026-23193 o CVE-2026-23204 o CVE-2026-23216 o CVE-2026-23231 References o https://access.redhat.com/security/updates/classification/#moderate - --------------------------END INCLUDED TEXT---------------------- You have received this e-mail bulletin as a result of your organisation's registration with AUSCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AUSCERT's members. As AUSCERT did not write the document quoted above, AUSCERT has had no control over its content. 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