CVE-2025-39681

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

State: Published
Severity: Not scored
Published: Sep 5, 2025
Updated: Oct 15, 2026
Reserved: Apr 16, 2025

Description

In 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. ]

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 to before 62f12cde10118253348a7540e85606869bd69432Affected 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 to before 873f32201df8876bdb2563e3187e79149427cab4Affected 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 to before fb81222c1559f89bfe3aa1010f6d112531d55353Affected 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 to before 7207923d8453ebfb35667c1736169f2dd796772eAffected 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 to before a9e5924daa954c9f585c1ca00358afe71d6781c4Affected 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 to before d23264c257a70dbe021b43b3bc2ee16134cd2c69Affected 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 to before d8df126349dad855cdfedd6bbf315bad2e901c2fAffected
LinuxLinux	5.8Affected before 5.8Not affected 5.10.242 through 5.10.Not affected 5.15.190 through 5.15.Not affected 6.1.149 through 6.1.Not affected 6.6.103 through 6.6.Not affected 6.12.44 through 6.12.Not affected 6.16.4 through 6.16.Not affected 6.17 and laterNot affected

Product

Versions

LinuxLinux

923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 to before 62f12cde10118253348a7540e85606869bd69432Affected
923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 to before 873f32201df8876bdb2563e3187e79149427cab4Affected
923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 to before fb81222c1559f89bfe3aa1010f6d112531d55353Affected
923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 to before 7207923d8453ebfb35667c1736169f2dd796772eAffected
923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 to before a9e5924daa954c9f585c1ca00358afe71d6781c4Affected
923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 to before d23264c257a70dbe021b43b3bc2ee16134cd2c69Affected
923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 to before d8df126349dad855cdfedd6bbf315bad2e901c2fAffected

LinuxLinux

5.8Affected
before 5.8Not affected
5.10.242 through 5.10.*Not affected
5.15.190 through 5.15.*Not affected
6.1.149 through 6.1.*Not affected
6.6.103 through 6.6.*Not affected
6.12.44 through 6.12.*Not affected
6.16.4 through 6.16.*Not affected
6.17 and laterNot affected

References

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