Critical severity · published Oct 30, 2025
CVE-2025-40099
cifs: parse_dfs_referrals: prevent oob on malformed input
9.4
CVSS
0.4%
EPSS
No
On KEV
Description
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
Low
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 35% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
Linux · Linux
4ecce920e13ace16a5ba45efe8909946c28fb2ad before cfacc7441f760e4a73cc71b6ff1635261d534657; 4ecce920e13ace16a5ba45efe8909946c28fb2ad before 15c73964da9df994302f579ed14ee5fdbce7a332; 4ecce920e13ace16a5ba45efe8909946c28fb2ad before 8bc4a8d39bac23d8b044fd3e2dbfd965f1d9b058; 4ecce920e13ace16a5ba45efe8909946c28fb2ad before bb0f2e66e1ac043a5b238f5bcab4f26f3c317039; 4ecce920e13ace16a5ba45efe8909946c28fb2ad before 6447b0e355562a1ff748c4a2ffb89aae7e84d2c9; 4.11 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-40099
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-40099
git.kernel.org
https://git.kernel.org/stable/c/15c73964da9df994302f579ed14ee5fdbce7a332
git.kernel.org
https://git.kernel.org/stable/c/6447b0e355562a1ff748c4a2ffb89aae7e84d2c9
git.kernel.org
https://git.kernel.org/stable/c/8bc4a8d39bac23d8b044fd3e2dbfd965f1d9b058
git.kernel.org
https://git.kernel.org/stable/c/bb0f2e66e1ac043a5b238f5bcab4f26f3c317039
git.kernel.org
https://git.kernel.org/stable/c/cfacc7441f760e4a73cc71b6ff1635261d534657
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