{"id":"CVE-2026-81016","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nplatform/x86/amd/pmc: Propagate SMU errors and validate S2D address\n\namd_stb_s2d_init() discards the return value of several S2D SMU commands.\nWhen the SMU refuses a co…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nplatform/x86/amd/pmc: Propagate SMU errors and validate S2D address\n\namd_stb_s2d_init() discards the return value of several S2D SMU commands.\nWhen the SMU refuses a co…","severity":"high","cvss":7.7,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","cwe":["CWE-908"],"vendor":"Linux","product":"Linux","affected":["Linux >= 3d7d407dfb05b257e15cb0c6b056428a4a8c2e5d < 638e1ca5d4e2b4fdbb209db64926d013b34f3b79","Linux >= 3d7d407dfb05b257e15cb0c6b056428a4a8c2e5d < 8178f59d76570b152d836bde07f5997f15861f04","Linux >= 3d7d407dfb05b257e15cb0c6b056428a4a8c2e5d < 775d4cde1f9737796ce7d8393521e9e8c5b49891","Linux >= 3d7d407dfb05b257e15cb0c6b056428a4a8c2e5d < 0225c1d637687b03726f00ac65b6def843d2c464","Linux 5.18"],"published":"2026-09-11","updated":"2026-10-03","sourceUpdated":"2026-10-03T11:17:41.710","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-81016","references":[{"url":"https://git.kernel.org/stable/c/0225c1d637687b03726f00ac65b6def843d2c464","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/638e1ca5d4e2b4fdbb209db64926d013b34f3b79","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/775d4cde1f9737796ce7d8393521e9e8c5b49891","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8178f59d76570b152d836bde07f5997f15861f04","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"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/85ef9d4c384c1d143c51580933674d94dba3b8d9"}],"tags":["nvd","cve.org","csaf","vex","red-hat","score-dispute"],"epss":0.00186,"epssPercentile":0.0808,"scores":{"nvd":7.7,"vendor":5.5,"cna":7.7},"ingestedAt":"2026-09-14T15:23:07.475Z","slug":"CVE-2026-81016","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nplatform/x86/amd/pmc: Propagate SMU errors and validate S2D address\n\namd_stb_s2d_init() discards the return value of several S2D SMU commands.\nWhen the SMU refuses a command (e.g. \"SMU cmd failed. err: 0xff\") the\nfailure is only noticed indirectly - if at all - and reported as -EIO,\nmasking the real error.\n\nMore seriously, the S2D_PHYS_ADDR_LOW/HIGH return values are ignored, so\non failure phys_addr_low/hi are left uninitialised and the assembled\naddress is passed straight to devm_ioremap().  When the SMU leaves them at\nzero this maps physical address 0 and trips the ioremap-on-RAM warning:\n\n  amd_pmc AMDI000B:00: SMU cmd failed. err: 0xff\n  ioremap on RAM at 0x0000000000000000 - 0x0000000000ffffff\n  WARNING: CPU: 13 PID: 4592 at arch/x86/mm/ioremap.c:...\n\nCheck the return value of each SMU command and propagate it, and reject a\nzero physical address before calling devm_ioremap().\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\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 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81016.json)","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":42.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":215290,"id":"CVE-2026-81016","ts":1791027880972,"field":"cvss","old":"5.5","new":"7.7"},{"seq":215289,"id":"CVE-2026-81016","ts":1791027880972,"field":"severity","old":"medium","new":"high"},{"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"}]}