CVE-2025-37947

Published May 20, 2025

Last updated 4 days ago

Overview

AI description

Automated description summarized from trusted sources.

CVE-2025-37947 is a vulnerability found in the Linux kernel's ksmbd filesystem component, specifically within the `ksmbdvfsstream_write()` function. Disclosed on May 20, 2025, the vulnerability arises from a missing bounds check in the `ksmbdvfsstreamwrite()` function. The function doesn't validate if the write offset (`*pos`) is within the bounds of the existing stream data length (`vlen`). If `*pos` is greater than or equal to `v_len`, it can lead to an out-of-bounds memory write. Successful exploitation of this vulnerability could result in out-of-bounds memory writes in the Linux kernel, potentially causing memory corruption or system crashes. A patch has been implemented to address this issue by adding a validation check for the write offset in `ksmbdvfsstreamwrite()`. The fix ensures that `*pos` is less than `vlen` before proceeding with the write operation, returning `-EINVAL` if the condition fails.

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.
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
NVD status: Modified
Products: linux_kernel, debian_linux

Risk scores

CVSS 3.1

Type: Primary
Base score: 7.8
Impact score: 5.9
Exploitability score: 1.8
Vector string: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Severity: HIGH

Weaknesses

nvd@nist.gov: CWE-787
134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-787

Hype score: Not currently trending

Configurations

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References

Sources include official advisories and independent security research.