CVE-2026-81016High· 7.7▾ TwilightIn 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 co…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.4 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.2%
— → 4.1
none → medium
— → 7.7
none → high
7.7 → 4.1
high → medium
7.7 → 4.1
high → medium
4.1 → 5.5
Last analysed / modified upstream
5.5 → 7.7
medium → high
In 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().
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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