CVE-2025-37947: debian linux Memory Corruption — Fix

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.

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CVSS v3.1 Score

7.8

HIGH

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

Weakness Type (CWE)

CWE-787 Out-of-bounds Write

Affected Products

Vendor	Product	Versions
linux	linux_kernel	5.15 — 6.1.139
linux	linux_kernel	6.2 — 6.6.91
linux	linux_kernel	6.7 — 6.12.29
linux	linux_kernel	6.13 — 6.14.7
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
debian	debian_linux	All

References

Advisories & Patches

https://git.kernel.org/stable/c/04c8a38c60346bb5a7c49b276de7233f703ce9cb https://git.kernel.org/stable/c/0ca6df4f40cf4c32487944aaf48319cb6c25accc https://git.kernel.org/stable/c/7f61da79df86fd140c7768e668ad846bfa7ec8e1 https://git.kernel.org/stable/c/d62ba16563a86aae052f96d270b3b6f78fca154c https://git.kernel.org/stable/c/e6356499fd216ed6343ae0363f4c9303f02c5034

Other References

https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html https://github.com/doyensec/KSMBD-CVE-2025-37947/blob/main/CVE-2025-37947.c

Frequently Asked Questions

What is CVE-2025-37947? +

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. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-37947? +

CVE-2025-37947 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-37947? +

CVE-2025-37947 affects products from debian, linux, specifically: debian_linux, linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-37947? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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