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: 2026-01-12 09:10 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

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
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