Bug 2467279 (CVE-2026-42009) - CVE-2026-42009 gnutls: gnutls: Denial of Service via DTLS packet reordering vulnerability
Summary: CVE-2026-42009 gnutls: gnutls: Denial of Service via DTLS packet reordering v...
Keywords:
Status: NEW
Alias: CVE-2026-42009
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-05-06 16:35 UTC by OSIDB Bzimport
Modified: 2026-07-07 14:22 UTC (History)
6 users (show)

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 RHBA-2026:20910 0 None None None 2026-05-26 12:27:00 UTC
Red Hat Product Errata RHBA-2026:20937 0 None None None 2026-05-26 15:25:10 UTC
Red Hat Product Errata RHSA-2026:20611 0 None None None 2026-05-26 06:15:28 UTC
Red Hat Product Errata RHSA-2026:20612 0 None None None 2026-05-26 06:20:06 UTC
Red Hat Product Errata RHSA-2026:20613 0 None None None 2026-05-26 06:18:02 UTC
Red Hat Product Errata RHSA-2026:26409 0 None None None 2026-06-16 16:39:23 UTC
Red Hat Product Errata RHSA-2026:29794 0 None None None 2026-06-30 15:49:27 UTC
Red Hat Product Errata RHSA-2026:30004 0 None None None 2026-06-25 18:07:35 UTC
Red Hat Product Errata RHSA-2026:30849 0 None None None 2026-06-29 02:48:30 UTC
Red Hat Product Errata RHSA-2026:30850 0 None None None 2026-06-29 02:30:13 UTC
Red Hat Product Errata RHSA-2026:32962 0 None None None 2026-06-29 09:47:26 UTC
Red Hat Product Errata RHSA-2026:33125 0 None None None 2026-06-29 15:07:29 UTC
Red Hat Product Errata RHSA-2026:34372 0 None None None 2026-07-01 18:45:59 UTC
Red Hat Product Errata RHSA-2026:34764 0 None None None 2026-07-07 14:22:27 UTC
Red Hat Product Errata RHSA-2026:34788 0 None None None 2026-07-07 12:38:51 UTC

Description OSIDB Bzimport 2026-05-06 16:35:48 UTC 
The comparator function used for ordering DTLS packets by sequence numbers did not follow qsort comparator contracts in case of packets with duplicate sequence numbers, which could lead to unstable ordering or undefined behaviour. Return 0 in such cases makes the sorting stable. Additionally, discard packets with same sequence numbers and differing handshake type, so that they don't end up being sorted in the first place.
Comment 2 errata-xmlrpc 2026-05-26 06:15:27 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:20611 https://access.redhat.com/errata/RHSA-2026:20611
Comment 3 errata-xmlrpc 2026-05-26 06:18:00 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:20613 https://access.redhat.com/errata/RHSA-2026:20613
Comment 4 errata-xmlrpc 2026-05-26 06:20:05 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:20612 https://access.redhat.com/errata/RHSA-2026:20612
Comment 10 errata-xmlrpc 2026-06-16 16:39:22 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:26409 https://access.redhat.com/errata/RHSA-2026:26409
Comment 12 errata-xmlrpc 2026-06-25 18:07:33 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:30004 https://access.redhat.com/errata/RHSA-2026:30004
Comment 13 errata-xmlrpc 2026-06-29 02:30:12 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-2026:30850 https://access.redhat.com/errata/RHSA-2026:30850
Comment 14 errata-xmlrpc 2026-06-29 02:48:28 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 Extended Update Support Long-Life Add-On

Via RHSA-2026:30849 https://access.redhat.com/errata/RHSA-2026:30849
Comment 15 errata-xmlrpc 2026-06-29 09:47:25 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:32962 https://access.redhat.com/errata/RHSA-2026:32962
Comment 16 errata-xmlrpc 2026-06-29 15:07:28 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-2026:33125 https://access.redhat.com/errata/RHSA-2026:33125
Comment 17 errata-xmlrpc 2026-06-30 15:49:26 UTC 
This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 4.22

Via RHSA-2026:29794 https://access.redhat.com/errata/RHSA-2026:29794
Comment 18 errata-xmlrpc 2026-07-01 18:45:58 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:34372 https://access.redhat.com/errata/RHSA-2026:34372
Comment 19 errata-xmlrpc 2026-07-07 12:38:50 UTC 
This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 4.20

Via RHSA-2026:34788 https://access.redhat.com/errata/RHSA-2026:34788
Comment 20 errata-xmlrpc 2026-07-07 14:22:25 UTC 
This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 4.21

Via RHSA-2026:34764 https://access.redhat.com/errata/RHSA-2026:34764
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