Critical 9.4Published Oct 30, 2025

CVE-2025-40099cifs: parse_dfs_referrals: prevent oob on malformed input

Updated under an hour ago (Oct 26, 2026, 11:50 PM ET)

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Exploited in the last 30 days

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 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Deferred
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 4ecce920e13ace16a5ba45efe8909946c28fb2ad before cfacc7441f760e4a73cc71b6ff1635261d534657; from 4ecce920e13ace16a5ba45efe8909946c28fb2ad before 15c73964da9df994302f579ed14ee5fdbce7a332; from 4ecce920e13ace16a5ba45efe8909946c28fb2ad before 8bc4a8d39bac23d8b044fd3e2dbfd965f1d9b058; from 4ecce920e13ace16a5ba45efe8909946c28fb2ad before bb0f2e66e1ac043a5b238f5bcab4f26f3c317039; from 4ecce920e13ace16a5ba45efe8909946c28fb2ad before 6447b0e355562a1ff748c4a2ffb89aae7e84d2c9	CNA record

References

References

https://git.kernel.org/stable/c/cfacc7441f760e4a73cc71b6ff1635261d534657
https://git.kernel.org/stable/c/15c73964da9df994302f579ed14ee5fdbce7a332
https://git.kernel.org/stable/c/8bc4a8d39bac23d8b044fd3e2dbfd965f1d9b058
https://git.kernel.org/stable/c/bb0f2e66e1ac043a5b238f5bcab4f26f3c317039
https://git.kernel.org/stable/c/6447b0e355562a1ff748c4a2ffb89aae7e84d2c9

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.