linux-cve-announce - CVE-2025-21913: x86/amd_nb: Use rdmsr_safe() in amd_get_mmconfig

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Message-ID: <2025040130-CVE-2025-21913-b942@gregkh>
Date: Tue,  1 Apr 2025 16:39:37 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-21913: x86/amd_nb: Use rdmsr_safe() in amd_get_mmconfig_range()

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

x86/amd_nb: Use rdmsr_safe() in amd_get_mmconfig_range()

Xen doesn't offer MSR_FAM10H_MMIO_CONF_BASE to all guests.  This results
in the following warning:

  unchecked MSR access error: RDMSR from 0xc0010058 at rIP: 0xffffffff8101d19f (xen_do_read_msr+0x7f/0xa0)
  Call Trace:
   xen_read_msr+0x1e/0x30
   amd_get_mmconfig_range+0x2b/0x80
   quirk_amd_mmconfig_area+0x28/0x100
   pnp_fixup_device+0x39/0x50
   __pnp_add_device+0xf/0x150
   pnp_add_device+0x3d/0x100
   pnpacpi_add_device_handler+0x1f9/0x280
   acpi_ns_get_device_callback+0x104/0x1c0
   acpi_ns_walk_namespace+0x1d0/0x260
   acpi_get_devices+0x8a/0xb0
   pnpacpi_init+0x50/0x80
   do_one_initcall+0x46/0x2e0
   kernel_init_freeable+0x1da/0x2f0
   kernel_init+0x16/0x1b0
   ret_from_fork+0x30/0x50
   ret_from_fork_asm+0x1b/0x30

based on quirks for a "PNP0c01" device.  Treating MMCFG as disabled is the
right course of action, so no change is needed there.

This was most likely exposed by fixing the Xen MSR accessors to not be
silently-safe.

The Linux kernel CVE team has assigned CVE-2025-21913 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 6.1 with commit 3fac3734c43a2e21fefeb72124d8bd31dff3956f and fixed in 6.1.131 with commit 0c65d13bdcc54e5b924ebe790f85a7f01bfe1cb1
	Issue introduced in 6.1 with commit 3fac3734c43a2e21fefeb72124d8bd31dff3956f and fixed in 6.6.83 with commit 8f43ba5ee498fe037d1570f6868d9aeaf49dda80
	Issue introduced in 6.1 with commit 3fac3734c43a2e21fefeb72124d8bd31dff3956f and fixed in 6.12.19 with commit ebf6a763904e42dabeb2e270ceb0bbe0f825d7ae
	Issue introduced in 6.1 with commit 3fac3734c43a2e21fefeb72124d8bd31dff3956f and fixed in 6.13.7 with commit 923fede9eae9865af305bcdf8f111e4b62ae4bda
	Issue introduced in 6.1 with commit 3fac3734c43a2e21fefeb72124d8bd31dff3956f and fixed in 6.14 with commit 14cb5d83068ecf15d2da6f7d0e9ea9edbcbc0457

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2025-21913
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	arch/x86/kernel/amd_nb.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/0c65d13bdcc54e5b924ebe790f85a7f01bfe1cb1
	https://git.kernel.org/stable/c/8f43ba5ee498fe037d1570f6868d9aeaf49dda80
	https://git.kernel.org/stable/c/ebf6a763904e42dabeb2e270ceb0bbe0f825d7ae
	https://git.kernel.org/stable/c/923fede9eae9865af305bcdf8f111e4b62ae4bda
	https://git.kernel.org/stable/c/14cb5d83068ecf15d2da6f7d0e9ea9edbcbc0457