CVE-2026-15813 Kronosnet: kronosnet: memory corruption and out-of-bounds access via malformed network packet defragmentation
An attacker can cause application crashes or system instability by sending malformed network packets that trigger out-of-bounds memory access in the packet defragmentation engine.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-15813?
CVE-2026-15813 is a medium-severity memory corruption vulnerability in Red Hat Enterprise Linux 10, published on 20 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-787
Which versions are affected by CVE-2026-15813?
How do I fix CVE-2026-15813?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-15813 being exploited?
There is no known exploitation of CVE-2026-15813 in the wild and no public exploit code.
Sources
Also known as AZL-92898, DEBIAN-CVE-2026-15813, GHSA-32vg-vj46-3h6w, UBUNTU-CVE-2026-15813.