Review reviewCritical

CVE-2025-40099

Linux

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.

CVSS: 9.4
EPSS: 0.38%
CISA KEV: Not listed
Published: 2025.10.30

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.38%

Technical severityCVSS 9.4

Vulnerability overview

Affected product and versions

Product: Linux
Affected versions: >= 4ecce920e13ace16a5ba45efe8909946c28fb2ad < cfacc7441f760e4a73cc71b6ff1635261d534657, >= 4ecce920e13ace16a5ba45efe8909946c28fb2ad < 15c73964da9df994302f579ed14ee5fdbce7a332, >= 4ecce920e13ace16a5ba45efe8909946c28fb2ad < 8bc4a8d39bac23d8b044fd3e2dbfd965f1d9b058, >= 4ecce920e13ace16a5ba45efe8909946c28fb2ad < bb0f2e66e1ac043a5b238f5bcab4f26f3c317039, >= 4ecce920e13ace16a5ba45efe8909946c28fb2ad < 6447b0e355562a1ff748c4a2ffb89aae7e84d2c9, >= 4.11
Fixed versions: No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that Linux and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H
CWE: Not available