🔐 CVE Alert

CVE-2025-39681

UNKNOWN 0.0

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

CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th

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. ]

Vendor linux
Product linux
Ecosystems
Industries
Technology
Published Sep 5, 2025
Last Updated May 12, 2026
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Affected Versions

Linux / Linux
923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 < 62f12cde10118253348a7540e85606869bd69432 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 < 873f32201df8876bdb2563e3187e79149427cab4 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 < fb81222c1559f89bfe3aa1010f6d112531d55353 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 < 7207923d8453ebfb35667c1736169f2dd796772e 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 < a9e5924daa954c9f585c1ca00358afe71d6781c4 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 < d23264c257a70dbe021b43b3bc2ee16134cd2c69 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 < d8df126349dad855cdfedd6bbf315bad2e901c2f
Linux / Linux
5.8

References

NVD ↗ CVE.org ↗ EPSS Data ↗
git.kernel.org: https://git.kernel.org/stable/c/62f12cde10118253348a7540e85606869bd69432 git.kernel.org: https://git.kernel.org/stable/c/873f32201df8876bdb2563e3187e79149427cab4 git.kernel.org: https://git.kernel.org/stable/c/fb81222c1559f89bfe3aa1010f6d112531d55353 git.kernel.org: https://git.kernel.org/stable/c/7207923d8453ebfb35667c1736169f2dd796772e git.kernel.org: https://git.kernel.org/stable/c/a9e5924daa954c9f585c1ca00358afe71d6781c4 git.kernel.org: https://git.kernel.org/stable/c/d23264c257a70dbe021b43b3bc2ee16134cd2c69 git.kernel.org: https://git.kernel.org/stable/c/d8df126349dad855cdfedd6bbf315bad2e901c2f lists.debian.org: https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html lists.debian.org: https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html cert-portal.siemens.com: https://cert-portal.siemens.com/productcert/html/ssa-032379.html