A missing upper-bound check in the udpif_set_threads() function of Open vSwitch v3.6.90…
Priority MEDIUM 62CWE-770Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-770.
Summary
A missing upper-bound check in the udpif_set_threads() function of Open vSwitch v3.6.90 allows an attacker with OVSDB write access to request an excessive number of handler or revalidation threads. This can cause a denial of service (DoS) via resource exhaustion.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00328 26th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Fast Datapath for RHEL 10 | Affected | No fix yet: Fix deferred |
| Fast Datapath for RHEL 7 | Affected | No fix yet: Fix deferred |
| Fast Datapath for RHEL 8 | Affected | No fix yet: Fix deferred |
| Fast Datapath for RHEL 9 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 7 | Affected | — |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-02 Threatist record created from CVE-2026-36499
- 2026-10-03 Alias added: GHSA-87x4-f37w-27p2
References
Sources
- CVE-2026-36499 · CVE Program
- CVE-2026-36499 · NVD
- FIRST EPSS
- GHSA-87x4-f37w-27p2 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-36499 · Red Hat security data · CC BY 4.0
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