Red Hat Product Errata RHSA-2026:49857 - Security Advisory Issued: 2026-08-04 Updated: 2026-08-04 RHSA-2026:49857 - Security Advisory Overview Updated Packages Synopsis Moderate: kernel security, bug fix, and enhancement update Type/Severity Security Advisory: Moderate 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 8. 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): kernel: ipc: limit next_id allocation to the valid ID range (CVE-2026-52923) Bug Fix(es) and Enhancement(s): RHEL8.10 - KVM: s390: Limit adapter indicator access to mapped page (JIRA:RHEL-183880) CIFS mounts do not work with the latest kernel (JIRA:RHEL-213976) 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. Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture. Because of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat's CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available. Affected Products Red Hat Enterprise Linux for x86_64 8 x86_64 Red Hat Enterprise Linux for IBM z Systems 8 s390x Red Hat Enterprise Linux for Power, little endian 8 ppc64le Red Hat Enterprise Linux for ARM 64 8 aarch64 Red Hat CodeReady Linux Builder for x86_64 8 x86_64 Red Hat CodeReady Linux Builder for Power, little endian 8 ppc64le Red Hat CodeReady Linux Builder for ARM 64 8 aarch64 Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 8.10 x86_64 Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 8.10 aarch64 Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 8.10 ppc64le Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 8.10 s390x Fixes BZ - 2492094 - CVE-2026-52923 kernel: ipc: limit next_id allocation to the valid ID range CVEs CVE-2026-52923 References https://access.redhat.com/security/updates/classification/#moderate Note: More recent versions of these packages may be available. Click a package name for more details. Red Hat Enterprise Linux for x86_64 8 SRPM kernel-4.18.0-553.151.1.el8_10.src.rpm SHA-256: f263001cfaeb90502cc27799e8f5cc3ac0d26ced6edf9a5453d4acb1bd31f724 x86_64 bpftool-4.18.0-553.151.1.el8_10.x86_64.rpm SHA-256: 3005d7d8b23def92632049d3b68fd719ab8ad2d6a27bb48b48bcdf970baa5a14 bpftool-debuginfo-4.18.0-553.151.1.el8_10.x86_64.rpm SHA-256: c967d8fa71f64f0cf5dc7c0ccc53a500e6287a1ed0cc94946124556b8ac3c262 kernel-4.18.0-553.151.1.el8_10.x86_64.rpm SHA-256: 5d0e2de270b3463c3e5cacd54604ee93a692a1c89a7bfe2132bb60ae078b6790 kernel-abi-stablelists-4.18.0-553.151.1.el8_10.noarch.rpm SHA-256: 3eec5974e79905053a08b02b74028e545264037c19f2c9a884bcb9afbd85d7a7 kernel-core-4.18.0-553.151.1.el8_10.x86_64.rpm SHA-256: b5d50646412f76c745df0836418fd1fe214f18b1ef82131368c41188af3601b9 kernel-cross-headers-4.18.0-553.151.1.el8_10.x86_64.rpm SHA-256: 6348a0b3124de470839e7c34de17c64f63bbf95581a147566a61da06133886f2 kernel-debug-4.18.0-553.151.1.el8_10.x86_64.rpm SHA-256: 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perf-4.18.0-553.151.1.el8_10.x86_64.rpm SHA-256: be67cbb79599ddfad6372a727b3fb03bda7e5de391483bdfed5e79cc7b39b486 perf-debuginfo-4.18.0-553.151.1.el8_10.x86_64.rpm SHA-256: 1e33d40f12a9c9b945dcc46746fd1d749b24c87ab8723759fefc4532a319d535 python3-perf-4.18.0-553.151.1.el8_10.x86_64.rpm SHA-256: 016c510cafb7f977c1b25983fd8b90a3c1ffa5e6534e09d60204369cf69fe7ab python3-perf-debuginfo-4.18.0-553.151.1.el8_10.x86_64.rpm SHA-256: efcdf73c567153da7bd14d9a90f1f51139de94e99839d4a14f3dfe4b7492721e Red Hat Enterprise Linux for IBM z Systems 8 SRPM kernel-4.18.0-553.151.1.el8_10.src.rpm SHA-256: f263001cfaeb90502cc27799e8f5cc3ac0d26ced6edf9a5453d4acb1bd31f724 s390x bpftool-4.18.0-553.151.1.el8_10.s390x.rpm SHA-256: b3a28849433740b8b9c2a62ef23e32e88e3285c31bfc3742bbed81f77cd133a6 bpftool-debuginfo-4.18.0-553.151.1.el8_10.s390x.rpm SHA-256: 6887c93f2f4be3fd3eaf541842215cdd3a8adcc9b38d2ccbe2aae2ecd909a514 kernel-4.18.0-553.151.1.el8_10.s390x.rpm SHA-256: 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