A vulnerability was found in openvswitch. A limitation in the implementation of userspace packet parsing can allow a malicious user to send a specially crafted packet causing the resulting megaflow in the kernel to be too wide, potentially causing a denial of service. The highest threat from this vulnerability is to system availability.
An official patch is available. Apply the patch as soon as possible.
CVSS v4.0 Metrics
Exploitability
Attack VectorNetwork
ComplexityLow
RequirementsPresent
PrivilegesNone
User InteractionNone
Threat
Exploit MaturityPoC
Vulnerable System
ConfidentialityNone
IntegrityNone
AvailabilityHigh
Subsequent System
ConfidentialityNone
IntegrityNone
AvailabilityNone
Supplemental
SafetyNegligible
AutomatableYes
RecoveryAutomatic
Value DensityConcentrated
UrgencyMedium
Patch StatusOfficial Patch
Change Log
| Date | Source | Changes | Score |
|---|
| 2026-07-21 | PoC | E: U→P | 4.6 → 6.9 |
| 2026-07-21 | nvd | patch: Unavailable→Official Patch | 4.6 → 4.6 |
| 2026-07-21 | cve.org | initial, patch: Unavailable | 4.6 |
Affected Software
| Vendor | Product | Version |
|---|
| debian | debian_linux | 10.0 |
| debian | debian_linux | 9.0 |
| fedoraproject | fedora | 33 |
| n/a | openvswitch | openvswitch 2.5.12, openvswitch 2.6.10, openvswitch 2.7.13, openvswitch 2.8.11, openvswitch 2.9.9, openvswitch 2.10.7, openvswit |
| openvswitch | openvswitch | ≥ 2.10.0, < 2.10.7 |
| openvswitch | openvswitch | ≥ 2.11.0, < 2.11.6 |
| openvswitch | openvswitch | ≥ 2.12.0, < 2.12.3 |
| openvswitch | openvswitch | ≥ 2.13.0, < 2.13.3 |
| openvswitch | openvswitch | ≥ 2.14.0, < 2.14.2 |
| openvswitch | openvswitch | ≥ 2.5.0, < 2.5.12 |
| openvswitch | openvswitch | ≥ 2.6.0, < 2.6.10 |
| openvswitch | openvswitch | ≥ 2.7.0, < 2.7.13 |
| openvswitch | openvswitch | ≥ 2.8.0, < 2.8.11 |
| openvswitch | openvswitch | ≥ 2.9.0, < 2.9.9 |
Published: 2021-02-11
