CVE-2025-37947
ksmbd: prevent out-of-bounds stream writes by validating *pos
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.
INFO
Published Date :
May 20, 2025, 4:15 p.m.
Last Modified :
Nov. 3, 2025, 8:18 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Update the Linux kernel to the latest patched version.
- Verify the integrity of the ksmbd module.
- Test the application after the update.
Public PoC/Exploit Available at Github
CVE-2025-37947 has a 2 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-37947.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-37947 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-37947
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Blog Post: https://blog.doyensec.com/2025/10/08/ksmbd-3.html
exploit linux ksmbd
C Makefile Shell
📡 PoC auto collect from GitHub. ⚠️ Be careful Malware.
security cve exploit poc vulnerability
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-37947 vulnerability anywhere in the article.
-
CybersecurityNews
Linux Kernel ksmbd Filesystem Vulnerability Exploited – PoC Released
Security researchers have released a full proof-of-concept (PoC) exploit for a high-severity vulnerability in the Linux kernel’s ksmbd module, demonstrating a reliable path to local privilege escalati ... Read more
The following table lists the changes that have been made to the
CVE-2025-37947 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 03, 2025
Action Type Old Value New Value Added Reference https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Oct. 27, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-787 Added Reference https://github.com/doyensec/KSMBD-CVE-2025-37947/blob/main/CVE-2025-37947.c -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 20, 2025
Action Type Old Value New Value 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. Added Reference https://git.kernel.org/stable/c/04c8a38c60346bb5a7c49b276de7233f703ce9cb Added Reference https://git.kernel.org/stable/c/0ca6df4f40cf4c32487944aaf48319cb6c25accc Added Reference https://git.kernel.org/stable/c/7f61da79df86fd140c7768e668ad846bfa7ec8e1 Added Reference https://git.kernel.org/stable/c/d62ba16563a86aae052f96d270b3b6f78fca154c Added Reference https://git.kernel.org/stable/c/e6356499fd216ed6343ae0363f4c9303f02c5034