CVE-2025-40099
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.
Affected versions
Linux kernel versions
4.11
and later are affected. Fixed in
6.1.158,
6.6.114,
6.12.55,
6.17.5,
6.18
and their respective stable series.
References
The following references provide additional information about CVE-2025-40099 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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PatchKernel patch commithttps://git.kernel.org/stable/c/15c73964da9df994302f579ed14ee5fdbce7a332
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PatchKernel patch commithttps://git.kernel.org/stable/c/6447b0e355562a1ff748c4a2ffb89aae7e84d2c9
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PatchKernel patch commithttps://git.kernel.org/stable/c/8bc4a8d39bac23d8b044fd3e2dbfd965f1d9b058
Frequently asked questions
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What is CVE-2025-40099?
CVE-2025-40099 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 4.11 onward and has been patched in 6.1.158, 6.6.114, 6.12.55 and others. CVE-2025-40099 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2025-40099?
Yes — CVE-2025-40099 has been patched. Fixed versions include 6.1.158, 6.6.114, 6.12.55 and others. If you are running Linux kernel 4.11 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2025-40099 actively exploited?
No — CVE-2025-40099 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.