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CVE-2025-39681— x86/cpu/hygon: Add missing resctrl_cpu_detect() in bsp_init helper

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于缺少resctrl_cpu_detect调用，可能导致除零错误。

AI Predicted 7.8 Difficulty: Theoretical EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9< 62f12cde10118253348a7540e85606869bd69432 affected
923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9< 873f32201df8876bdb2563e3187e79149427cab4 affected
923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9< fb81222c1559f89bfe3aa1010f6d112531d55353 affected
923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9< 7207923d8453ebfb35667c1736169f2dd796772e affected
923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9< a9e5924daa954c9f585c1ca00358afe71d6781c4 affected
923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9< d23264c257a70dbe021b43b3bc2ee16134cd2c69 affected
923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9< d8df126349dad855cdfedd6bbf315bad2e901c2f affected
5.8 affected
… +8 more rows
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I. Basic Information for CVE-2025-39681

Vulnerability Information
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Vulnerability Title
x86/cpu/hygon: Add missing resctrl_cpu_detect() in bsp_init helper
Source: CVE Program / CVE List V5
Vulnerability 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. ]
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于缺少resctrl_cpu_detect调用，可能导致除零错误。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9 ~ 62f12cde10118253348a7540e85606869bd69432 -
Linux Linux 5.8 -

II. Public POCs for CVE-2025-39681

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III. Intelligence Information for CVE-2025-39681

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Same Patch Batch · Linux · 2025-09-05 · 60 CVEs total

CVE-2025-39726 9.8 CRITICAL s390/ism: fix concurrency management in ism_cmd()
CVE-2025-39682 9.8 CRITICAL tls: fix handling of zero-length records on the rx_list
CVE-2025-38734 9.8 CRITICAL net/smc: fix UAF on smcsk after smc_listen_out()
CVE-2025-39702 9.8 CRITICAL ipv6: sr: Fix MAC comparison to be constant-time
CVE-2025-39703 9.8 CRITICAL net, hsr: reject HSR frame if skb can't hold tag
CVE-2025-38737 9.8 CRITICAL cifs: Fix oops due to uninitialised variable
CVE-2025-39673 9.8 CRITICAL ppp: fix race conditions in ppp_fill_forward_path
CVE-2025-39704 8.8 HIGH LoongArch: KVM: Fix stack protector issue in send_ipi_data()
CVE-2025-39718 8.4 HIGH vsock/virtio: Validate length in packet header before skb_put()
CVE-2025-39711 7.8 HIGH media: ivsc: Fix crash at shutdown due to missing mei_cldev_disable() calls
CVE-2025-39710 7.8 HIGH media: venus: Add a check for packet size after reading from shared memory
CVE-2025-39697 7.8 HIGH NFS: Fix a race when updating an existing write
CVE-2025-39714 7.8 HIGH media: usbtv: Lock resolution while streaming
CVE-2025-39717 7.8 HIGH open_tree_attr: do not allow id-mapping changes without OPEN_TREE_CLONE
CVE-2025-39698 7.8 HIGH io_uring/futex: ensure io_futex_wait() cleans up properly on failure
CVE-2025-38731 7.8 HIGH drm/xe: Fix vm_bind_ioctl double free bug
CVE-2025-39696 7.8 HIGH ALSA: hda: tas2781: Fix wrong reference of tasdevice_priv
CVE-2025-39691 7.8 HIGH fs/buffer: fix use-after-free when call bh_read() helper
CVE-2025-39689 7.8 HIGH ftrace: Also allocate and copy hash for reading of filter files
CVE-2025-39677 7.8 HIGH net/sched: Fix backlog accounting in qdisc_dequeue_internal

Showing top 20 of 60 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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