EUVD-2026-45899
GHSA-32vg-vj46-3h6w
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
Network-accessible reassembly engine reachable without authentication; AC:H reflects required precision in fragment crafting; A:H for crash/heap corruption, I:L for incidental memory modification, C:N as no data disclosure path exists.
Primary rating from Vendor (redhat).
CVSS VectorNVD
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
Lifecycle Timeline
2DescriptionNVD
A vulnerability was found in the network packet de-fragmentation engine of kronosnet (Version affected <= 1.34). The internal reassembly code does not properly validate sequence numbers of incoming payload fragments. An attacker can exploit this lack of verification by transmitting malformed packets with corrupted sequence parameters. Under specific conditions, this forces the packet processing layer to parse data outside the designated bounds of the internal memory structures, causing an out-of-bounds memory access or heap corruption. This behavior can result in sudden application crashes or system instability.
AnalysisAI
Out-of-bounds memory corruption in kronosnet's packet reassembly engine (versions ≤ 1.34) enables a remote, unauthenticated network attacker to crash the kronosnet process or cause heap corruption by transmitting malformed fragmented packets carrying invalid sequence numbers. Affected deployments span Red Hat Enterprise Linux 8, 9, and 10, and Red Hat OpenShift Container Platform 4, making this relevant to HA clustering infrastructure that depends on kronosnet for inter-node communication via Corosync or Pacemaker. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the ability to send crafted fragmented network packets directly to a host running kronosnet with the packet processing engine active - meaning kronosnet must be deployed and operational, typically as part of a Corosync HA cluster. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 6.5 with vector AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H captures a dual reality: the attack requires no authentication or user interaction and is network-accessible (elevating base concern), but AC:H significantly reduces exploitability by requiring the attacker to craft packets that meet precise fragment reassembly state conditions - correct ordering, timing, or protocol state - making opportunistic or automated mass exploitation unlikely. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with access to the cluster interconnect network segment - such as a compromised node on the same VLAN or a rogue host with routing access to the cluster heartbeat network - transmits a crafted sequence of fragmented packets with deliberately malformed or out-of-range sequence number fields to the kronosnet listener. The reassembly engine, lacking proper bounds validation, uses the corrupted sequence value to index outside the allocated fragment buffer, corrupting adjacent heap memory. … |
| Remediation | No specific patched version number is confirmed in the available data at time of analysis; the definitive remediation is to apply the updated kronosnet package once Red Hat publishes it via their advisory at https://access.redhat.com/security/cve/CVE-2026-15813 - monitor that URL and the Bugzilla entry at https://bugzilla.redhat.com/show_bug.cgi?id=2500854 for package availability. … Detailed patch versions, workarounds, and compensating controls in full report. |
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View allVendor StatusVendor
SUSE
Severity: Moderate| Product | Status |
|---|---|
| SUSE Linux Enterprise High Availability Extension 16.0 | Affected |
| SUSE Linux Enterprise High Availability Extension 16.1 | Affected |
| SUSE Linux Enterprise Server for SAP applications 16.0 | Affected |
| SUSE Linux Enterprise Server for SAP applications 16.1 | Affected |
| openSUSE Leap 16.0 | Affected |
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