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CVE-2025-40240

HIGHCVSS 7.5/10EPSS 0.19%

Last modified

CVE-2025-40240 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.19% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability
0.19%

8.7th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 90017accff61ae89283ad9a51f9ac46ca01633fb, < 61cda2777b07d27459f5cac5a047c3edf9c8a1a9; >= 90017accff61ae89283ad9a51f9ac46ca01633fb, < 08165c296597075763130919f2aae59b5822f016; >= 90017accff61ae89283ad9a51f9ac46ca01633fb, < 03e80a4b04ef1fb2c61dd63216ab8d3a5dcb196f; >= 90017accff61ae89283ad9a51f9ac46ca01633fb, < 4f6da435fb5d8a21cbf8cae5ca5a2ba0e1012b71; >= 90017accff61ae89283ad9a51f9ac46ca01633fb, < cb9055ba30306ede4ad920002233d0659982f1cb; >= 90017accff61ae89283ad9a51f9ac46ca01633fb, < 7a832b0f99be19df608cb75c023f8027b1789bd1; >= 90017accff61ae89283ad9a51f9ac46ca01633fb, < 89b465b54227c245ddc7cc9ed822231af21123ef; >= 90017accff61ae89283ad9a51f9ac46ca01633fb, < 441f0647f7673e0e64d4910ef61a5fb8f16bfb82
LinuxLinux4.8

References

Timeline

Published
Last Modified
Status
Deferred

Frequently Asked Questions

What is CVE-2025-40240?
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.
How severe is CVE-2025-40240?
CVE-2025-40240 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.19% probability of exploitation in the next 30 days.
How do I fix CVE-2025-40240?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST