CVE-2025-39681

Summary

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. ]

Affected Software

VendorProductVersion RangeStatus
LinuxLinux923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 < 62f12cde10118253348a7540e85606869bd69432affected
LinuxLinux923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 < 873f32201df8876bdb2563e3187e79149427cab4affected
LinuxLinux923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 < fb81222c1559f89bfe3aa1010f6d112531d55353affected
LinuxLinux923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 < 7207923d8453ebfb35667c1736169f2dd796772eaffected
LinuxLinux923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 < a9e5924daa954c9f585c1ca00358afe71d6781c4affected
LinuxLinux923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 < d23264c257a70dbe021b43b3bc2ee16134cd2c69affected
LinuxLinux923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 < d8df126349dad855cdfedd6bbf315bad2e901c2faffected
LinuxLinux5.8affected
LinuxLinux0 < 5.8unaffected
LinuxLinux5.10.242 <= 5.10.*unaffected
LinuxLinux5.15.190 <= 5.15.*unaffected
LinuxLinux6.1.149 <= 6.1.*unaffected
LinuxLinux6.6.103 <= 6.6.*unaffected
LinuxLinux6.12.44 <= 6.12.*unaffected
LinuxLinux6.16.4 <= 6.16.*unaffected
LinuxLinux6.17 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

Additional References

References