Answer in brief
CVE-2025-40240 records a Unknown severity 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.
Answer in brief
CVE-2025-40240 records a Unknown severity 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.
A CVSS score is not reported in the current record. 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
Aug 5, 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.
A CVSS score is not reported in the current record. 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
Aug 5, 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.