CVE-2025-39681Medium· 5.5▾ SunlitIn 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…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 30.3 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.2%
0.2% → 0.2%
Last analysed / modified upstream
— → 5.5
none → medium
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. ]
linux_kernel >= 5.8, < 5.10.242linux_kernel >= 5.11, < 5.15.190linux_kernel >= 5.16, < 6.1.149linux_kernel >= 6.2, < 6.6.103linux_kernel >= 6.7, < 6.12.44linux_kernel >= 6.13, < 6.16.4linux_kernel = 6.17debian_linux = 11.0Upgrade past the affected range:
linux_kernel 6.16.4Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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