Linux Kernel: security vulnerability (CVE-2025-68239)
Published Last modified Sources: Debian, Debian LTS, SUSE, Siemens ProductCERT, Ubuntu, BSI, Msrc Update Guide, CVE.org, EUVD
What is affected, what to do
In the Linux kernel, the following vulnerability has been resolved: binfmt_misc: restore write access before closing files opened by open_exec() bm_register_write() opens an executable file using open_exec(), which internally calls do_open_execat() and denies write access on the file to avoid modification while it is being executed. However, when an error occurs, bm_register_write() closes the file using filp_close() directly.
The available sources name no fixed version. Check the vendor guidance in the references below.
Conflicting version data — version display is hidden until the data is resolved.
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Metrics
6.2
Priority
XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.
Source: Vendor (CNA), CVSS v3
6.2
CVSS v3
Severity Medium on the scale from 0 to 10.
Source: Debian, Debian LTS, SUSE, Siemens ProductCERT, Ubuntu, BSI, Msrc Update Guide, CVE.org, EUVD
0.2 %
EPSS score
Low — model estimates < 1% exploitation likelihood.
Source: FIRST EPSS, percentile 9.4
Show all metrics
- Severity
- Medium
Priority (0–325)
The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?
Read in glossary- 44.46 Methodology
Exploit maturity
An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.
Read in glossary- no public PoC known
XIEM Effective CVSS
XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.
Read in glossary- 6.2 Methodology
CVSS v3
CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.
Read in glossary- 6.2
EPSS score
The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.
Read in glossary- 0.2 %
- Low — model estimates < 1% exploitation likelihood.
EPSS percentile
The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.
Read in glossary- 9.4
- Low — this CVE sits in the lower 10% of all CVEs scored today.
KEV status
The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.
Read in glossary- —
- Published
Detection rules
No NEOSEC detection rule is available for this vulnerability yet.
Classification under NIS2 and CRA
Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.
NIS2
NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.
Read in glossary- Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.
CRA
The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.
Read in glossary- From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
ISO/IEC 27001
ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.
Read in glossary- Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.
Description
In the Linux kernel, the following vulnerability has been resolved: binfmt_misc: restore write access before closing files opened by open_exec() bm_register_write() opens an executable file using open_exec(), which internally calls do_open_execat() and denies write access on the file to avoid modification while it is being executed. However, when an error occurs, bm_register_write() closes the file using filp_close() directly. This does not restore the write permission, which may cause subsequent write operations on the same file to fail. Fix this by calling exe_file_allow_write_access() before filp_close() to restore the write permission properly.
Source: Debian Security Advisories, Debian LTS Advisories, suse_csaf, siemens_advisory, Ubuntu Security Notices, BSI WID Portal, BSI CSAF, Microsoft Security Update Guide, cvelistv5, NVD (NIST), CVE.org (MITRE), ENISA EUVD
Affected products
The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.
| Affected versions | Fixed in | ||
|---|---|---|---|
| Linux | Linux |
|
|
| Siemens | SIMATIC S7 |
|
|
Vendors and products
Affected operating systems
| Linux | debian | linux | bookworm |
| Linux | debian | linux | trixie |
| Linux | debian | linux-6.1 | bullseye |
References & sources
- git.kernel.orgstable/c/54274ff90488b6c0f595a6518faed3cf0bc966eb
- git.kernel.orgstable/c/480ac88431703f2adbb8e6b5bd73c3f3cf9f3d7f
- git.kernel.orgstable/c/fbab8c08e1a6dbaef81e22d672a7647553101d16
- git.kernel.orgstable/c/6cce7bc7fac8471c832696720d9c8f2a976d9c54
- git.kernel.orgstable/c/e785f552ab04dbca01d31f0334f4561240b04459
- git.kernel.orgstable/c/90f601b497d76f40fa66795c3ecf625b6aced9fd
- Siemens ProductCERTproductcert/html/ssa-784472.html
Changes to this CVE
Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).
Record modifiedLinux
New references:- https://git.kernel.org/stable/c/480ac88431703f2adbb8e6b5bd73c3f3cf9f3d7f
- https://git.kernel.org/stable/c/54274ff90488b6c0f595a6518faed3cf0bc966eb
- https://git.kernel.org/stable/c/6cce7bc7fac8471c832696720d9c8f2a976d9c54
- https://git.kernel.org/stable/c/90f601b497d76f40fa66795c3ecf625b6aced9fd
and 2 more references
Show 12 original changes
Individual changes of this event as published by NVD Type Action Before After Reference added —https://git.kernel.org/stable/c/480ac88431703f2adbb8e6b5bd73c3f3cf9f3d7fReference added —https://git.kernel.org/stable/c/54274ff90488b6c0f595a6518faed3cf0bc966ebReference added —https://git.kernel.org/stable/c/6cce7bc7fac8471c832696720d9c8f2a976d9c54Reference added —https://git.kernel.org/stable/c/90f601b497d76f40fa66795c3ecf625b6aced9fdReference added —https://git.kernel.org/stable/c/e785f552ab04dbca01d31f0334f4561240b04459Reference added —https://git.kernel.org/stable/c/fbab8c08e1a6dbaef81e22d672a7647553101d16Reference removed https://git.kernel.org/stable/c/480ac88431703f2adbb8e6b5bd73c3f3cf9f3d7f—Reference removed https://git.kernel.org/stable/c/54274ff90488b6c0f595a6518faed3cf0bc966eb—Reference removed https://git.kernel.org/stable/c/6cce7bc7fac8471c832696720d9c8f2a976d9c54—Reference removed https://git.kernel.org/stable/c/90f601b497d76f40fa66795c3ecf625b6aced9fd—Reference removed https://git.kernel.org/stable/c/e785f552ab04dbca01d31f0334f4561240b04459—Reference removed https://git.kernel.org/stable/c/fbab8c08e1a6dbaef81e22d672a7647553101d16—Source identifier: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Record modifiedSiemens ADP
Show 2 original changes
Individual changes of this event as published by NVD Type Action Before After Affected versions (publisher) added —New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2025/68xxx/CVE-2025-68239.json">CVE-2025-68239</a>Reference added —https://cert-portal.siemens.com/productcert/html/ssa-784472.htmlSource identifier: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
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<a href="https://intel.neosec.eu/en/cve/CVE-2025-68239"><img src="https://intel.neosec.eu/badge/cve/CVE-2025-68239.svg?lang=en" alt="CVE-2025-68239 – NEOSEC Intel" height="20"></a>