Answer in brief
CVE-2025-40240 records a High severity (CVSS 7.5) vulnerability in sctp: avoid NULL dereference when chunk data buffer is missing. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=90017accff61ae89283ad9a51f9ac46ca01633fb <61cda2777b07d27459f5cac5a047c3edf9c8a1a9 || >=90017accff61ae89283ad9a51f9ac46ca01633fb <08165c296597075763130919f2aae59b5822f016 || >=90017accff61ae89283ad9a51f9ac46ca01633fb <03e80a4b04ef1fb2c61dd63216ab8d3a5dcb196f || >=90017accff61ae89283ad9a51f9ac46ca01633fb <4f6da435fb5d8a21cbf8cae5ca5a2ba0e1012b71 || >=90017accff61ae89283ad9a51f9ac46ca01633fb <cb9055ba30306ede4ad920002233d0659982f1cb || >=90017accff61ae89283ad9a51f9ac46ca01633fb <7a832b0f99be19df608cb75c023f8027b1789bd1 || >=90017accff61ae89283ad9a51f9ac46ca01633fb <89b465b54227c245ddc7cc9ed822231af21123ef || >=90017accff61ae89283ad9a51f9ac46ca01633fb <441f0647f7673e0e64d4910ef61a5fb8f16bfb82 | 61cda2777b07d27459f5cac5a047c3edf9c8a1a9, 08165c296597075763130919f2aae59b5822f016, 03e80a4b04ef1fb2c61dd63216ab8d3a5dcb196f, 4f6da435fb5d8a21cbf8cae5ca5a2ba0e1012b71, cb9055ba30306ede4ad920002233d0659982f1cb, 7a832b0f99be19df608cb75c023f8027b1789bd1, 89b465b54227c245ddc7cc9ed822231af21123ef, 441f0647f7673e0e64d4910ef61a5fb8f16bfb82 |
| Linux/Linuxgeneric | 4.8 | Not reported |
Published upstream
Dec 4, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.