CVE-2025-40187
In the Linux kernel, the following vulnerability has been resolved: net/sctp: fix a null dereference in sctp_disposition sctp_sf_do_5_1D_ce() If new_asoc->peer.adaptation_ind=0 and sctp_ulpevent_make_authkey=0 and sctp_ulpevent_make_authkey() returns 0, then the variable ai_ev remains zero and the zero will be dereferenced in the sctp_ulpevent_free() function.
Affected versions
Linux kernel versions
4.17
and later are affected. Fixed in
5.4.301,
5.10.246,
5.15.195,
6.1.157,
6.6.113,
6.12.54,
6.17.4,
6.18
and their respective stable series.
References
The following references provide additional information about CVE-2025-40187 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/025419f4e216a3ae0d0cec622262e98e8078c447
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PatchKernel patch commithttps://git.kernel.org/stable/c/1014b83778c8677f1d7a57c26dc728baa801ac62
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PatchKernel patch commithttps://git.kernel.org/stable/c/2f3119686ef50319490ccaec81a575973da98815
Frequently asked questions
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What is CVE-2025-40187?
CVE-2025-40187 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 4.17 onward and has been patched in 5.4.301, 5.10.246, 5.15.195 and others. CVE-2025-40187 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-2025-40187?
Yes — CVE-2025-40187 has been patched. Fixed versions include 5.4.301, 5.10.246, 5.15.195 and others. If you are running Linux kernel 4.17 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2025-40187 actively exploited?
No — CVE-2025-40187 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.