High 7.5Published Dec 4, 2025

CVE-2025-40240sctp: avoid NULL dereference when chunk data buffer is missing

Updated under an hour ago (Oct 26, 2026, 7:50 PM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: sctp: avoid NULL dereference when chunk data buffer is missing chunk->skb pointer is dereferenced in the if-block where it's supposed to be NULL only. chunk->skb can only be NULL if chunk->head_skb is not. Check for frag_list instead and do it just before replacing chunk->skb. We're sure that otherwise chunk->skb is non-NULL because of outer if() condition.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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: Aug 5, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	90017accff61ae89283ad9a51f9ac46ca01633fb builds before 61cda2777b07d27459f5cac5a047c3edf9c8a1a9; 90017accff61ae89283ad9a51f9ac46ca01633fb builds before 08165c296597075763130919f2aae59b5822f016; 90017accff61ae89283ad9a51f9ac46ca01633fb builds before 03e80a4b04ef1fb2c61dd63216ab8d3a5dcb196f; 90017accff61ae89283ad9a51f9ac46ca01633fb builds before 4f6da435fb5d8a21cbf8cae5ca5a2ba0e1012b71; from 90017accff61ae89283ad9a51f9ac46ca01633fb before cb9055ba30306ede4ad920002233d0659982f1cb; 90017accff61ae89283ad9a51f9ac46ca01633fb builds before 7a832b0f99be19df608cb75c023f8027b1789bd1; 90017accff61ae89283ad9a51f9ac46ca01633fb builds before 89b465b54227c245ddc7cc9ed822231af21123ef; 90017accff61ae89283ad9a51f9ac46ca01633fb builds before 441f0647f7673e0e64d4910ef61a5fb8f16bfb82	CNA record

References

References

https://git.kernel.org/stable/c/61cda2777b07d27459f5cac5a047c3edf9c8a1a9
https://git.kernel.org/stable/c/08165c296597075763130919f2aae59b5822f016
https://git.kernel.org/stable/c/03e80a4b04ef1fb2c61dd63216ab8d3a5dcb196f
https://git.kernel.org/stable/c/4f6da435fb5d8a21cbf8cae5ca5a2ba0e1012b71
https://git.kernel.org/stable/c/cb9055ba30306ede4ad920002233d0659982f1cb
https://git.kernel.org/stable/c/7a832b0f99be19df608cb75c023f8027b1789bd1
https://git.kernel.org/stable/c/89b465b54227c245ddc7cc9ed822231af21123ef
https://git.kernel.org/stable/c/441f0647f7673e0e64d4910ef61a5fb8f16bfb82

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.