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 products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 5 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | kronosnet | 1.35-1 | — |
| Debian 13 | kronosnet | No fix yet | — |
| Debian 12 | kronosnet | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | kronosnet | No fix yet | — |
| Ubuntu 26.04 LTS | kronosnet | No fix yet | — |
| Ubuntu 24.04 LTS | kronosnet | No fix yet | — |
| Ubuntu 22.04 LTS | kronosnet | No fix yet | — |
| Ubuntu 20.04 LTS | kronosnet | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | kronosnet | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | kronosnet | 1.30-160000.4.1 | SUSE-SU-2026:23792-1 |
| SLES 16.0 | kronosnet | 1.30-160000.4.1 | SUSE-SU-2026:23782-1 |
| SLE Micro 6.2 | kernel-livepatch-SLE16-RT_Update_15 | 3-160000.1.1 | SUSE-SU-2026:23792-1 |
| SLE Micro 6.2 | rpm | 4.20.1-160000.3.1 | SUSE-SU-2026:23782-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | kronosnet | 1.33-2.1 | openSUSE-SU-2026:11364-1 |
| openSUSE Leap 16.0 | kronosnet | 1.30-160000.4.1 | openSUSE-SU-2026:21851-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | kronosnet | No fix yet | — |
Advisories 4
- SUSE-SU-2026:23792-1 Security update for kronosnet SUSE / openSUSE Security Updates · Sep 27, 2026
- SUSE-SU-2026:23782-1 Security update for kronosnet SUSE / openSUSE Security Updates · Sep 27, 2026
- openSUSE-SU-2026:21851-1 Security update for kronosnet SUSE / openSUSE Security Updates · Sep 17, 2026
- openSUSE-SU-2026:11364-1 libknet-devel-1.33-2.1 on GA media SUSE / openSUSE Security Updates · Jul 25, 2026
References
- https://access.redhat.com/security/cve/CVE-2026-15813 vdb-entry
- RHBZ#2500854 issue-tracking