In the Linux kernel, the following vulnerability has been resolved:

ksmbd: prevent out-of-bounds stream writes by validating *pos

ksmbd_vfs_stream_write() did not validate whether the write offset
(*pos) was within the bounds of the existing stream data length (v_len).
If *pos was greater than or equal to v_len, this could lead to an
out-of-bounds memory write.

This patch adds a check to ensure *pos is less than v_len before
proceeding. If the condition fails, -EINVAL is returned.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00023.

Exploitation poc

Automatable no

Technical Impact total

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

No data.

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors Products
Linux
  • Linux Kernel
Advisories
Source ID Title
Debian DLA Debian DLA DLA-4271-1 linux-6.1 security update
Debian DSA Debian DSA DSA-5925-1 linux security update
EUVD EUVD EUVD-2025-15903 In the Linux kernel, the following vulnerability has been resolved: ksmbd: prevent out-of-bounds stream writes by validating *pos ksmbd_vfs_stream_write() did not validate whether the write offset (*pos) was within the bounds of the existing stream data length (v_len). If *pos was greater than or equal to v_len, this could lead to an out-of-bounds memory write. This patch adds a check to ensure *pos is less than v_len before proceeding. If the condition fails, -EINVAL is returned.
Ubuntu USN Ubuntu USN USN-7699-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-7699-2 Linux kernel (HWE) vulnerabilities
Ubuntu USN Ubuntu USN USN-7721-1 Linux kernel (Azure) vulnerabilities
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/04c8a38c60346bb5a7c49b276de7233f703ce9cb cve-icon cve-icon
https://git.kernel.org/stable/c/0ca6df4f40cf4c32487944aaf48319cb6c25accc cve-icon cve-icon
https://git.kernel.org/stable/c/7f61da79df86fd140c7768e668ad846bfa7ec8e1 cve-icon cve-icon
https://git.kernel.org/stable/c/d62ba16563a86aae052f96d270b3b6f78fca154c cve-icon cve-icon
https://git.kernel.org/stable/c/e6356499fd216ed6343ae0363f4c9303f02c5034 cve-icon cve-icon
https://github.com/doyensec/KSMBD-CVE-2025-37947/blob/main/CVE-2025-37947.c cve-icon cve-icon
https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html cve-icon
https://lore.kernel.org/linux-cve-announce/2025052059-CVE-2025-37947-8c07@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-37947 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-37947 cve-icon
History

Mon, 03 Nov 2025 20:30:00 +0000

Type Values Removed Values Added
References

Mon, 27 Oct 2025 14:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-787
References
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

 ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

Mon, 14 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.00045}

 epss

{'score': 0.00037}

Thu, 22 May 2025 02:45:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Low

Tue, 20 May 2025 16:15:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: ksmbd: prevent out-of-bounds stream writes by validating *pos ksmbd_vfs_stream_write() did not validate whether the write offset (*pos) was within the bounds of the existing stream data length (v_len). If *pos was greater than or equal to v_len, this could lead to an out-of-bounds memory write. This patch adds a check to ensure *pos is less than v_len before proceeding. If the condition fails, -EINVAL is returned.
Title ksmbd: prevent out-of-bounds stream writes by validating *pos
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2025-11-03T19:57:37.368Z

Reserved: 2025-04-16T04:51:23.972Z

Link: CVE-2025-37947

cve-icon Vulnrichment

Updated: 2025-10-09T12:57:30.347Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-05-20T16:15:32.677

Modified: 2025-11-03T20:18:42.830

Link: CVE-2025-37947

cve-icon Redhat

Severity : Low

Publid Date: 2025-05-20T00:00:00Z

Links: CVE-2025-37947 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2025-06-27T09:26:50Z