CVE-2025-39681
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. ]
How to fix
- linux linux_kernel5.10.242, 5.15.190, 6.1.149, 6.6.103, 6.12.44, 6.16.4 or later
- git.kernel.org/stable/c/62f12cde10118253348a7540e85606869bd69432
- git.kernel.org/stable/c/7207923d8453ebfb35667c1736169f2dd796772e
- git.kernel.org/stable/c/873f32201df8876bdb2563e3187e79149427cab4
- git.kernel.org/stable/c/a9e5924daa954c9f585c1ca00358afe71d6781c4
- git.kernel.org/stable/c/d23264c257a70dbe021b43b3bc2ee16134cd2c69
- git.kernel.org/stable/c/d8df126349dad855cdfedd6bbf315bad2e901c2f
- git.kernel.org/stable/c/fb81222c1559f89bfe3aa1010f6d112531d55353
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 5.8 ≤ v < 5.10.242, 5.11 ≤ v < 5.15.190, 5.16 ≤ v < 6.1.149, 6.2 ≤ v < 6.6.103, 6.7 ≤ v < 6.12.44, 6.13 ≤ v < 6.16.4, 6.17 | 5.10.242, 5.15.190, 6.1.149, 6.6.103, 6.12.44, 6.16.4 |
| debian debian_linux | 11.0 | — |
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