Bug 2407341 (CVE-2025-40099) - CVE-2025-40099 kernel: cifs: parse_dfs_referrals: prevent oob on malformed input
Summary: CVE-2025-40099 kernel: cifs: parse_dfs_referrals: prevent oob on malformed input
Keywords:
Status: NEW
Alias: CVE-2025-40099
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-10-30 10:02 UTC by OSIDB Bzimport
Modified: 2025-10-30 16:31 UTC (History)
0 users

Fixed In Version:
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Description OSIDB Bzimport 2025-10-30 10:02:36 UTC 
In the Linux kernel, the following vulnerability has been resolved:

cifs: parse_dfs_referrals: prevent oob on malformed input

Malicious SMB server can send invalid reply to FSCTL_DFS_GET_REFERRALS

- reply smaller than sizeof(struct get_dfs_referral_rsp)
- reply with number of referrals smaller than NumberOfReferrals in the
header

Processing of such replies will cause oob.

Return -EINVAL error on such replies to prevent oob-s.
Comment 1 Jon Moroney 2025-10-30 16:29:14 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025103017-CVE-2025-40099-fdf0@gregkh/T
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