{"id":"CVE-2026-81016","title":"kernel: platform/x86/amd/pmc: Propagate SMU errors and validate S2D address (CVE-2026-81016)","summary":"A flaw was found in the Linux kernel. Specifically, within the AMD Platform Management Controller (PMC) component, the `amd_stb_s2d_init()` function does not properly validate memory addresses returned by System Management Unit (SMU) comma…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-908","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-14","sourceUpdated":"2026-09-14T17:36:44+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81016.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81016.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-81016"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532049"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-81016"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-81016"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-81016.mbox"},{"url":"https://git.kernel.org/stable/c/0225c1d637687b03726f00ac65b6def843d2c464"},{"url":"https://git.kernel.org/stable/c/775d4cde1f9737796ce7d8393521e9e8c5b49891"},{"url":"https://git.kernel.org/stable/c/8178f59d76570b152d836bde07f5997f15861f04"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.0018,"epssPercentile":0.07884,"scores":{"vendor":4.1,"cna":7.7},"ingestedAt":"2026-09-14T15:23:07.475Z","slug":"CVE-2026-81016","body":"## Overview\n\nA flaw was found in the Linux kernel. Specifically, within the AMD Platform Management Controller (PMC) component, the `amd_stb_s2d_init()` function does not properly validate memory addresses returned by System Management Unit (SMU) commands. This can result in the kernel attempting to map a critical memory region at address zero, leading to system warnings and potential instability. This issue could be exploited by a local attacker to cause a denial of service.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81016.json)\n\n**kernel: platform/x86/amd/pmc: Propagate SMU errors and validate S2D address** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-14.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNot affected:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nFix deferred","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":204227,"id":"CVE-2026-81016","ts":1789490240392,"field":"cvss","old":"4.1","new":"5.5"},{"seq":202915,"id":"CVE-2026-81016","ts":1789403732927,"field":"cvss","old":"7.7","new":"4.1"},{"seq":202914,"id":"CVE-2026-81016","ts":1789403732927,"field":"severity","old":"high","new":"medium"},{"seq":183558,"id":"CVE-2026-81016","ts":1789356675879,"field":"cvss","old":"7.7","new":"4.1"},{"seq":183557,"id":"CVE-2026-81016","ts":1789356675879,"field":"severity","old":"high","new":"medium"},{"seq":153214,"id":"CVE-2026-81016","ts":1789285349578,"field":"cvss","old":null,"new":"7.7"},{"seq":153213,"id":"CVE-2026-81016","ts":1789285349578,"field":"severity","old":"none","new":"high"},{"seq":109562,"id":"CVE-2026-81016","ts":1789183732424,"field":"cvss","old":null,"new":"4.1"},{"seq":109561,"id":"CVE-2026-81016","ts":1789183732424,"field":"severity","old":"none","new":"medium"}]}