CVE-2025-40240
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-12-04

Last updated on: 2025-12-04

Assigner: kernel.org

Description
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.
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Meta Information
Published
2025-12-04
Last Modified
2025-12-04
Generated
2026-06-16
AI Q&A
2025-12-04
EPSS Evaluated
2026-06-15
NVD
CVE-2025-40240
EUVD
EUVD-2025-201219
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability in the Linux kernel involves a NULL pointer dereference in the SCTP (Stream Control Transmission Protocol) implementation. Specifically, the chunk->skb pointer is dereferenced in a code block where it is expected to be NULL, which can lead to a crash or unexpected behavior. The fix involves checking the frag_list before replacing chunk->skb to ensure it is not NULL when accessed.

Impact Analysis

This vulnerability can cause the Linux kernel to crash or behave unexpectedly due to a NULL pointer dereference in the SCTP protocol handling. This could lead to denial of service or instability on systems using affected kernel versions.

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