Trending
CVE-2025-39681

CVE detail

CVE-2025-39681

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. ]

CVSS 5.5 · MediumBuzz score 42.1

Buzz score

Why this CVE is surfacing

Buzz score total 42.1

This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.

Buzz score components · mention 25.6 · diversity 16.5 · KEV 0.0 · OTX 0.0 · PoC 0.0

Mention score

25.6

12 evidence mentions in the snapshot

Diversity score

16.5

4 sources across 3 categories

KEV score

0.0

No KEV entry observed

OTX score

0.0

0 OTX pulses

PoC score

0.0

0 repos · best confidence N/A

Best PoC traction

Maximum stars on a matched PoC repo

Why it matters now

Mention timeline

Total mentions: 1; within the 30d window
Peak daily: 1; highest bucket

Evidence

Source links by recency

Newest mentions first

12 source links · newest first

Siemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFPCISA Alerts
00 CPU 1518(F)-4 PN/DP MFP are affected: SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) vers:intdot/>=3.1.6 (CVE-2021-41617, CVE-2023-28531, CVE-2023-51384, CVE-2023-52927, CVE-2024-26783, CVE-2024-27056, CVE-2024-28956, CVE-2024-36903, CVE-2024-36927, CVE-2024-42079, CVE-2024-46786, CVE-2024-47736, CVE-2024-47809, CVE-2024-49968, CVE-2024-4
governmentwww.cisa.govJul 28, 2026, 12:00 PM
https://cert-portal.siemens.com/productcert/html/ssa-032379.htmlcert-portal.siemens.com
No excerpt available.
Vendor Advisorycert-portal.siemens.comSep 5, 2025, 6:15 PM
https://cert-portal.siemens.com/productcert/html/ssa-019113.htmlcert-portal.siemens.com
No excerpt available.
Vendor Advisorycert-portal.siemens.comSep 5, 2025, 6:15 PM
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmllists.debian.org
No excerpt available.
Vendor Advisorylists.debian.orgSep 5, 2025, 6:15 PM
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.htmllists.debian.org
No excerpt available.
Vendor Advisorylists.debian.orgSep 5, 2025, 6:15 PM
https://git.kernel.org/stable/c/fb81222c1559f89bfe3aa1010f6d112531d55353git.kernel.org
No excerpt available.
Exploitgit.kernel.orgSep 5, 2025, 6:15 PM
https://git.kernel.org/stable/c/d8df126349dad855cdfedd6bbf315bad2e901c2fgit.kernel.org
No excerpt available.
Exploitgit.kernel.orgSep 5, 2025, 6:15 PM
https://git.kernel.org/stable/c/d23264c257a70dbe021b43b3bc2ee16134cd2c69git.kernel.org
No excerpt available.
Exploitgit.kernel.orgSep 5, 2025, 6:15 PM
https://git.kernel.org/stable/c/a9e5924daa954c9f585c1ca00358afe71d6781c4git.kernel.org
No excerpt available.
Exploitgit.kernel.orgSep 5, 2025, 6:15 PM
https://git.kernel.org/stable/c/873f32201df8876bdb2563e3187e79149427cab4git.kernel.org
No excerpt available.
Exploitgit.kernel.orgSep 5, 2025, 6:15 PM
https://git.kernel.org/stable/c/7207923d8453ebfb35667c1736169f2dd796772egit.kernel.org
No excerpt available.
Exploitgit.kernel.orgSep 5, 2025, 6:15 PM
https://git.kernel.org/stable/c/62f12cde10118253348a7540e85606869bd69432git.kernel.org
No excerpt available.
Exploitgit.kernel.orgSep 5, 2025, 6:15 PM

Exploit code

Public exploit repository references

Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.

0 repository references · best confidence N/A · max 0 stars

No public PoC repositories have been matched yet.

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External lookup

Potential internet exposure

Potential exposure only — not proof of vulnerability.Shodan results indicate potentially internet-exposed products, not confirmed vulnerable systems. They do not confirm that any returned system is vulnerable to CVE-2025-39681.

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Product CPE queries

Derived from this CVE's existing NVD CPE 2.3 records; the application, operating-system, or hardware part is retained.

cpe:2.3:o:debian:debian_linuxSearch this product on Shodan
cpe:2.3:o:linux:linux_kernelSearch this product on Shodan

Exact CVE query

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Metadata

Canonical fields

NVD status

Modified

Published

Sep 5, 2025

Modified

Jul 14, 2026

Official record

Authoritative NVD record

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE IDs

Unavailable

Vendor classifications

How this vector reads

CVSS 3.1 base metrics decoded below. This explanation does not recalculate or change the NVD score.

Attack Vector (AV): Local. The attacker needs local access to the vulnerable system.
Attack Complexity (AC): Low. No special conditions beyond the attacker-controlled steps are required.
Privileges Required (PR): Low. The attacker needs basic user-level privileges.
User Interaction (UI): None. Exploitation does not require another user to act.
Scope (S): Unchanged. Impacts remain within the vulnerable security authority.
Confidentiality Impact (C): None. There is no direct impact to this security property.
Integrity Impact (I): None. There is no direct impact to this security property.
Availability Impact (A): High. There is a total or serious impact to this security property.

Signals

Exploitation indicators

0 stored signals · no KEV · 0 OTX pulses