CVE-2025-37947: debian debian_linux Out-of-bounds Write

Vulnerability summary

CVE-2025-37947 is a high (CVSS 8.8) Out-of-bounds Write vulnerability in debian debian_linux. EPSS estimates a 0.65% chance of exploitation in the next 30 days, higher than 50.3% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 20-05-2025
   PublishedVulnerability first disclosed.
2. 05-08-2026
   Last modifiedVulnerability information updated.

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.

• CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.