CVE-2025-38178 Information

Jul 05, 2025 cve

Description

In the Linux kernel the following vulnerability has been resolved:

EDAC/igen6: Fix NULL pointer dereference

A kernel panic was reported with the following kernel log:

EDAC igen6: Expected 2 mcs but only 1 detected. BUG: unable to handle page fault for address: 000000000000d570 … Hardware name: Notebook V54x_6x_TU/V54x_6x_TU BIOS Dasharo (coreboot+UEFI) v0.9.0 07/17/2024 RIP: e030:ecclog_handler+0x7e/0xf0 [igen6_edac] … igen6_probe+0x2a0/0x343 [igen6_edac] … igen6_init+0xc5/0xff0 [igen6_edac] …

This issue occurred because one memory controller was disabled by the BIOS but the igen6_edac driver still checked all the memory controllers including this absent one to identify the source of the error. Accessing the null MMIO for the absent memory controller resulted in the oops above.

Fix this issue by reverting the configuration structure to non-const and updating the field ‘res_cfg->num_imc’ to reflect the number of detected memory controllers.

Reference

https://git.kernel.org/stable/c/40e69c93d6dadc5355bfe90f3940c402d171289c https://git.kernel.org/stable/c/88efa0de3285be66969b71ec137d9dab1ee19e52

CNNVD-202507-448 (Published: 2025-07-04)

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