Bug 2418832 (CVE-2025-40240) - CVE-2025-40240 kernel: sctp: avoid NULL dereference when chunk data buffer is missing
Summary: CVE-2025-40240 kernel: sctp: avoid NULL dereference when chunk data buffer is...
Keywords:
Status: NEW
Alias: CVE-2025-40240
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-12-04 16:03 UTC by OSIDB Bzimport
Modified: 2026-04-08 08:32 UTC (History)
0 users

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:0443 0 None None None 2026-01-12 02:37:14 UTC
Red Hat Product Errata RHSA-2026:0444 0 None None None 2026-01-12 03:27:53 UTC
Red Hat Product Errata RHSA-2026:0445 0 None None None 2026-01-12 04:42:31 UTC
Red Hat Product Errata RHSA-2026:0453 0 None None None 2026-01-12 09:10:53 UTC
Red Hat Product Errata RHSA-2026:1727 0 None None None 2026-02-02 15:25:20 UTC
Red Hat Product Errata RHSA-2026:2535 0 None None None 2026-02-11 11:50:53 UTC
Red Hat Product Errata RHSA-2026:4745 0 None None None 2026-03-17 14:32:50 UTC
Red Hat Product Errata RHSA-2026:4899 0 None None None 2026-03-18 09:49:49 UTC
Red Hat Product Errata RHSA-2026:5690 0 None None None 2026-03-25 00:20:31 UTC
Red Hat Product Errata RHSA-2026:5691 0 None None None 2026-03-25 00:35:07 UTC
Red Hat Product Errata RHSA-2026:5693 0 None None None 2026-03-25 00:26:47 UTC
Red Hat Product Errata RHSA-2026:5727 0 None None None 2026-03-25 04:10:13 UTC
Red Hat Product Errata RHSA-2026:5732 0 None None None 2026-03-25 05:30:04 UTC
Red Hat Product Errata RHSA-2026:5813 0 None None None 2026-03-25 14:30:53 UTC
Red Hat Product Errata RHSA-2026:7003 0 None None None 2026-04-08 08:32:12 UTC

Description OSIDB Bzimport 2025-12-04 16:03:06 UTC 
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.
Comment 1 Alexander B 2025-12-05 15:29:30 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025120403-CVE-2025-40240-745a@gregkh/T
Comment 6 errata-xmlrpc 2026-01-12 02:37:13 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:0443 https://access.redhat.com/errata/RHSA-2026:0443
Comment 7 errata-xmlrpc 2026-01-12 03:27:52 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:0444 https://access.redhat.com/errata/RHSA-2026:0444
Comment 8 errata-xmlrpc 2026-01-12 04:42:30 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:0445 https://access.redhat.com/errata/RHSA-2026:0445
Comment 9 errata-xmlrpc 2026-01-12 09:10:52 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:0453 https://access.redhat.com/errata/RHSA-2026:0453
Comment 10 errata-xmlrpc 2026-02-02 15:25:19 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:1727 https://access.redhat.com/errata/RHSA-2026:1727
Comment 11 errata-xmlrpc 2026-02-11 11:50:51 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:2535 https://access.redhat.com/errata/RHSA-2026:2535
Comment 12 errata-xmlrpc 2026-03-17 14:32:49 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:4745 https://access.redhat.com/errata/RHSA-2026:4745
Comment 13 errata-xmlrpc 2026-03-18 09:49:48 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:4899 https://access.redhat.com/errata/RHSA-2026:4899
Comment 14 errata-xmlrpc 2026-03-25 00:20:30 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:5690 https://access.redhat.com/errata/RHSA-2026:5690
Comment 15 errata-xmlrpc 2026-03-25 00:26:46 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2026:5693 https://access.redhat.com/errata/RHSA-2026:5693
Comment 16 errata-xmlrpc 2026-03-25 00:35:06 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.6 Telecommunications Update Service

Via RHSA-2026:5691 https://access.redhat.com/errata/RHSA-2026:5691
Comment 17 errata-xmlrpc 2026-03-25 04:10:11 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Advanced Update Support

Via RHSA-2026:5727 https://access.redhat.com/errata/RHSA-2026:5727
Comment 18 errata-xmlrpc 2026-03-25 05:30:03 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2026:5732 https://access.redhat.com/errata/RHSA-2026:5732
Comment 19 errata-xmlrpc 2026-03-25 14:30:52 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:5813 https://access.redhat.com/errata/RHSA-2026:5813
Comment 20 errata-xmlrpc 2026-04-08 08:32:11 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Via RHSA-2026:7003 https://access.redhat.com/errata/RHSA-2026:7003
Note You need to log in before you can comment on or make changes to this bug.