Description
A flaw was found in gnutls. A remote attacker could exploit an issue in the Datagram Transport Layer Security (DTLS) packet reordering logic. The comparator function, responsible for ordering DTLS packets by sequence numbers, did not correctly handle packets with duplicate sequence numbers. This could lead to unstable packet ordering or undefined behavior, resulting in a denial of service.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected products
- gnu / gnutls
- RedHat / enterprise_linux10.0 – 10.0
- RedHat / enterprise_linux10.0 – 10.0
- RedHat / enterprise_linux6.0 – 6.0
- RedHat / enterprise_linux7.0 – 7.0
- RedHat / enterprise_linux8.0 – 8.0
- RedHat / enterprise_linux8.0 – 8.0
- RedHat / enterprise_linux10.2 – 10.2
- RedHat / enterprise_linux9.0 – 9.0
- RedHat / enterprise_linux9.0 – 9.0
- RedHat / enterprise_linux9.8 – 9.8
- RedHat / enterprise_linux10.2 – 10.2
- RedHat / enterprise_linux_for_els8.10 – 8.10
- RedHat / enterprise_linux_for_els10.2 – 10.2
- RedHat / enterprise_linux_for_els8.10 – 8.10
- RedHat / enterprise_linux_for_els10.2 – 10.2
- RedHat / enterprise_linux_for_els9.8 – 9.8
- RedHat / enterprise_linux_for_els9.8 – 9.8
- RedHat / enterprise_linux_for_eus10.2 – 10.2
- RedHat / enterprise_linux_for_eus9.8 – 9.8
- RedHat / enterprise_linux_for_eus9.8 – 9.8
- RedHat / enterprise_linux_for_eus10.2 – 10.2
- RedHat / enterprise_linux_for_ibm_z_systems8.0_s390x – 8.0_s390x
- RedHat / enterprise_linux_for_ibm_z_systems10.2 – 10.2
- RedHat / enterprise_linux_for_ibm_z_systems9.0_s390x – 9.0_s390x
- RedHat / enterprise_linux_for_ibm_z_systems_els10.2 – 10.2
- RedHat / enterprise_linux_for_ibm_z_systems_els8.10 – 8.10
- RedHat / enterprise_linux_for_ibm_z_systems_els9.8 – 9.8
- RedHat / enterprise_linux_for_ibm_z_systems_eus9.8 – 9.8
- RedHat / enterprise_linux_for_ibm_z_systems_eus10.2 – 10.2
- RedHat / enterprise_linux_for_power_little_endian10.2 – 10.2
- RedHat / enterprise_linux_for_power_little_endian9.0_ppc64le – 9.0_ppc64le
- RedHat / enterprise_linux_for_power_little_endian8.0_ppc64le – 8.0_ppc64le
- RedHat / enterprise_linux_for_power_little_endian10.0 – 10.0
- RedHat / enterprise_linux_for_power_little_endian_els9.8 – 9.8
- RedHat / enterprise_linux_for_power_little_endian_els8.10 – 8.10
- RedHat / enterprise_linux_for_power_little_endian_els10.2 – 10.2
- RedHat / enterprise_linux_for_power_little_endian_eus10.2 – 10.2
- RedHat / enterprise_linux_for_power_little_endian_eus9.8 – 9.8
- RedHat / enterprise_linux_for_update_services_for_sap_solutions9.8 – 9.8
- RedHat / enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions9.8 – 9.8
- RedHat / hardened_images
- RedHat / openshift_container_platform4.0 – 4.0
References
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:13274
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:20611
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:20612
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:20613
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:26319
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:26409
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:29197
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:29794
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:30004
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:30849
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:30850
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:32962
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:33125
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:34372
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:34764
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:34788
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:36004
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:36005
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:36006
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:40762
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:41921
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:57483
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:58981
- VENDOR_ADVISORYhttps://access.redhat.com/security/cve/CVE-2026-42009
- MISChttps://bugzilla.redhat.com/show_bug.cgi?id=2467279
- MISChttps://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-2
Updated 21m ago · 8 sources