Vulnerability · Published Jul 20, 2026 · Assigned by redhat
CVE-2026-15813Kronosnet: kronosnet: memory corruption and out-of-bounds access via malformed network packet defragmentation
Medium 6.5
In plain English
A medium-severity out-of-bounds write in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | kronosnet | no fix listed | DEBIAN-CVE-2026-15813 |
| Debian:13 | kronosnet | no fix listed | DEBIAN-CVE-2026-15813 |
| Debian:14 | kronosnet | 1.35-1 | DEBIAN-CVE-2026-15813 |
| Ubuntu:22.04:LTS | kronosnet | no fix listed | UBUNTU-CVE-2026-15813 |
| Ubuntu:24.04:LTS | kronosnet | no fix listed | UBUNTU-CVE-2026-15813 |
| Ubuntu:26.04:LTS | kronosnet | no fix listed | UBUNTU-CVE-2026-15813 |
| Ubuntu:26.10 | kronosnet | no fix listed | UBUNTU-CVE-2026-15813 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
| Red Hat | Red Hat OpenShift Container Platform 4 | see references |
| Red Hat | Red Hat OpenShift Container Platform 5 | see references |
Weakness: CWE-787 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
References
- https://access.redhat.com/security/cve/CVE-2026-15813 vdb-entry, x_refsource_REDHAT
- RHBZ#2500854 issue-tracking, x_refsource_REDHAT