Bug 2367569 (CVE-2025-37947)

Summary: CVE-2025-37947 kernel: ksmbd: prevent out-of-bounds stream writes by validating *pos
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: low    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-05-20 17:01:17 UTC 
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.
Comment 1 Jon Moroney 2025-05-21 01:13:17 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025052059-CVE-2025-37947-8c07@gregkh/T