GHSA-WV8R-9HH3-P28X
Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-10-30 15:33In the Linux kernel, the following vulnerability has been resolved:
platform/x86/amd/pmc: Propagate SMU errors and validate S2D address
amd_stb_s2d_init() discards the return value of several S2D SMU commands. When the SMU refuses a command (e.g. "SMU cmd failed. err: 0xff") the failure is only noticed indirectly - if at all - and reported as -EIO, masking the real error.
More seriously, the S2D_PHYS_ADDR_LOW/HIGH return values are ignored, so on failure phys_addr_low/hi are left uninitialised and the assembled address is passed straight to devm_ioremap(). When the SMU leaves them at zero this maps physical address 0 and trips the ioremap-on-RAM warning:
amd_pmc AMDI000B:00: SMU cmd failed. err: 0xff ioremap on RAM at 0x0000000000000000 - 0x0000000000ffffff WARNING: CPU: 13 PID: 4592 at arch/x86/mm/ioremap.c:...
Check the return value of each SMU command and propagate it, and reject a zero physical address before calling devm_ioremap().
{
"affected": [],
"aliases": [
"CVE-2026-81016"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-11T20:19:10Z",
"severity": "HIGH"
},
"details": "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 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().",
"id": "GHSA-wv8r-9hh3-p28x",
"modified": "2026-10-30T15:33:17Z",
"published": "2026-09-11T21:31:24Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-81016"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0225c1d637687b03726f00ac65b6def843d2c464"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/638e1ca5d4e2b4fdbb209db64926d013b34f3b79"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/646cdcc6c7594d8ad81577b2cb05276a927edc28"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/775d4cde1f9737796ce7d8393521e9e8c5b49891"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8178f59d76570b152d836bde07f5997f15861f04"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/85ef9d4c384c1d143c51580933674d94dba3b8d9"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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