CVE-2026-81016

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> platform/x86/amd/pmc: Propagate SMU errors and validate S2D address<br /> <br /> amd_stb_s2d_init() discards the return value of several S2D SMU commands.<br /> When the SMU refuses a command (e.g. "SMU cmd failed. err: 0xff") the<br /> failure is only noticed indirectly - if at all - and reported as -EIO,<br /> masking the real error.<br /> <br /> More seriously, the S2D_PHYS_ADDR_LOW/HIGH return values are ignored, so<br /> on failure phys_addr_low/hi are left uninitialised and the assembled<br /> address is passed straight to devm_ioremap(). When the SMU leaves them at<br /> zero this maps physical address 0 and trips the ioremap-on-RAM warning:<br /> <br /> amd_pmc AMDI000B:00: SMU cmd failed. err: 0xff<br /> ioremap on RAM at 0x0000000000000000 - 0x0000000000ffffff<br /> WARNING: CPU: 13 PID: 4592 at arch/x86/mm/ioremap.c:...<br /> <br /> Check the return value of each SMU command and propagate it, and reject a<br /> zero physical address before calling devm_ioremap().