x86/cpu/hygon: Add missing resctrl_cpu_detect() in bsp_init helper

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Summary

CVECVE-2025-39681
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-09-05 18:15:44 UTC
Updated2026-05-12 13:17:04 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: x86/cpu/hygon: Add missing resctrl_cpu_detect() in bsp_init helper Since 923f3a2b48bd ("x86/resctrl: Query LLC monitoring properties once during boot") resctrl_cpu_detect() has been moved from common CPU initialization code to the vendor-specific BSP init helper, while Hygon didn't put that call in their code. This triggers a division by zero fault during early booting stage on our machines with X86_FEATURE_CQM* supported, where get_rdt_mon_resources() tries to calculate mon_l3_config with uninitialized boot_cpu_data.x86_cache_occ_scale. Add the missing resctrl_cpu_detect() in the Hygon BSP init helper. [ bp: Massage commit message. ]

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: NVD-CWE-noinfo

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 62f12cde10118253348a7540e85606869bd69432 git Not specified
CNA Linux Linux affected 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 873f32201df8876bdb2563e3187e79149427cab4 git Not specified
CNA Linux Linux affected 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 fb81222c1559f89bfe3aa1010f6d112531d55353 git Not specified
CNA Linux Linux affected 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 7207923d8453ebfb35667c1736169f2dd796772e git Not specified
CNA Linux Linux affected 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 a9e5924daa954c9f585c1ca00358afe71d6781c4 git Not specified
CNA Linux Linux affected 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 d23264c257a70dbe021b43b3bc2ee16134cd2c69 git Not specified
CNA Linux Linux affected 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 d8df126349dad855cdfedd6bbf315bad2e901c2f git Not specified
CNA Linux Linux affected 5.8 Not specified
CNA Linux Linux unaffected 5.8 semver Not specified
CNA Linux Linux unaffected 5.10.242 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.190 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.149 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.103 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.44 6.12.* semver Not specified
CNA Linux Linux unaffected 6.16.4 6.16.* semver Not specified
CNA Linux Linux unaffected 6.17 * original_commit_for_fix Not specified
ADP Siemens SIMATIC CN 4100 affected V5.0 custom Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a9e5924daa954c9f585c1ca00358afe71d6781c4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d8df126349dad855cdfedd6bbf315bad2e901c2f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/10/msg00008.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Third Party Advisory
git.kernel.org/stable/c/62f12cde10118253348a7540e85606869bd69432 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-032379.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/fb81222c1559f89bfe3aa1010f6d112531d55353 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d23264c257a70dbe021b43b3bc2ee16134cd2c69 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/7207923d8453ebfb35667c1736169f2dd796772e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/873f32201df8876bdb2563e3187e79149427cab4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/10/msg00007.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Third Party Advisory
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