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Review reviewHigh

CVE-2025-37947

Linux Linux, linux kernel, debian linux

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.

CVSS
7.8
EPSS
0.48%
39.0% percentile
CISA KEV
Not listed
Published
2025.05.21
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.48%
Technical severityCVSS 7.8

Vulnerability overview

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.

Affected product and versions

Product
Linux Linux, linux kernel, debian linux
Affected versions
>= 0626e6641f6b467447c81dd7678a69c66f7746cf < 7f61da79df86fd140c7768e668ad846bfa7ec8e1, >= 0626e6641f6b467447c81dd7678a69c66f7746cf < 04c8a38c60346bb5a7c49b276de7233f703ce9cb, >= 0626e6641f6b467447c81dd7678a69c66f7746cf < d62ba16563a86aae052f96d270b3b6f78fca154c, >= 0626e6641f6b467447c81dd7678a69c66f7746cf < e6356499fd216ed6343ae0363f4c9303f02c5034, >= 0626e6641f6b467447c81dd7678a69c66f7746cf < 0ca6df4f40cf4c32487944aaf48319cb6c25accc, >= 5.15, >= 5.15 < 6.1.139, >= 6.2 < 6.6.91, >= 6.7 < 6.12.29, >= 6.13 < 6.14.7, 6.15, 11.0
Fixed versions
6.1.139, 6.6.91, 6.12.29, 6.14.7

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel, debian linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-787
CVE-2025-37947 — Linux Linux, linux kernel, debian linux | SECUFOCUS NOW