CVE-2025-40157

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> EDAC/i10nm: Skip DIMM enumeration on a disabled memory controller<br /> <br /> When loading the i10nm_edac driver on some Intel Granite Rapids servers,<br /> a call trace may appear as follows:<br /> <br /> UBSAN: shift-out-of-bounds in drivers/edac/skx_common.c:453:16<br /> shift exponent -66 is negative<br /> ...<br /> __ubsan_handle_shift_out_of_bounds+0x1e3/0x390<br /> skx_get_dimm_info.cold+0x47/0xd40 [skx_edac_common]<br /> i10nm_get_dimm_config+0x23e/0x390 [i10nm_edac]<br /> skx_register_mci+0x159/0x220 [skx_edac_common]<br /> i10nm_init+0xcb0/0x1ff0 [i10nm_edac]<br /> ...<br /> <br /> This occurs because some BIOS may disable a memory controller if there<br /> aren&amp;#39;t any memory DIMMs populated on this memory controller. The DIMMMTR<br /> register of this disabled memory controller contains the invalid value<br /> ~0, resulting in the call trace above.<br /> <br /> Fix this call trace by skipping DIMM enumeration on a disabled memory<br /> controller.