CVE-2018-5390
HighLinux kernel versions 4.9+ can be forced to make very expensive calls to tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() for every incoming packet which can lead to a denial of service.
Published Aug 6, 2018 · Updated Aug 4, 2026 · Also known as DEBIAN-CVE-2018-5390, SUSE-SU-2019:0955-1, SUSE-SU-2019:1425-1, SUSE-SU-2019:1767-1, SUSE-SU-2019:2230-1, SUSE-SU-2019:2601-1, SUSE-SU-2019:2821-1, UBUNTU-CVE-2018-5390, USN-3732-1, USN-3732-2
Key Facts
Patch immediately- CVE-2018-5390 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting Collaboration Meeting Rooms (Cisco), Digital Network Architecture Center (Cisco), Expressway Series (Cisco) and 22 more products.
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 71% probability of exploitation in the next 30 days.
- Fixed versions are available, including cluster-md-kmp-default 4.12.14-25.6.1, cluster-md-kmp-default 4.4.121-92.92.1, cluster-md-kmp-default 4.4.143-94.47.1.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (30-day exploit likelihood)
71%
Higher than 99.4% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
None known
Get the full CVE-2018-5390 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
Linux kernel versions 4.9+ can be forced to make very expensive calls to tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() for every incoming packet which can lead to a denial of service.
Affected Products
765 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Collaboration Meeting RoomsCisco | 1.0 | n/a |
| Digital Network Architecture CenterCisco | 1.2 | n/a |
| Expressway SeriesCisco | See advisory | n/a |
| ExpresswayCisco | x8.10, x8.10.1, x8.10.2, x8.10.3, x8.10.4, x8.11 | n/a |
| Meeting ManagementCisco | 1.0, 1.0.1 | n/a |
Patched Releases
cluster-md-kmp-default
4.12.14-25.6.1, 4.4.121-92.92.1, 4.4.143-94.47.1
cluster-md-kmp-rt
4.4.147-3.20.1
cluster-network-kmp-default
4.4.121-92.92.1
dlm-kmp-default
4.12.14-25.6.1, 4.4.121-92.92.1, 4.4.143-94.47.1
dlm-kmp-rt
4.4.147-3.20.1
dpdk
16.11.6-8.7.2
dpdk-devel
16.11.6-8.7.2
dpdk-kmp-default
16.11.6_k4.4.143_94.47-8.7.2
dpdk-thunderx
16.11.6-8.7.2
dpdk-thunderx-devel
16.11.6-8.7.2
dpdk-thunderx-kmp-default
16.11.6_k4.4.143_94.47-8.7.2
dpdk-tools
16.11.6-8.7.2
Big-Ip Access Policy Manager
<=11.6.3
Big-Ip Advanced Firewall Manager
<=11.6.3
Big-Ip Analytics
<=11.6.3
Big-Ip Application Acceleration Manager
<=11.6.3
Big-Ip Application Security Manager
<=11.6.3
Big-Ip Domain Name System
<=11.6.3
Big-Ip Edge Gateway
<=11.6.3
Big-Ip Fraud Protection Service
<=11.6.3
Big-Ip Global Traffic Manager
<=11.6.3
Big-Ip Link Controller
<=11.6.3
Big-Ip Local Traffic Manager
<=11.6.3
Big-Ip Policy Enforcement Manager
<=11.6.3
Big-Ip Webaccelerator
<=11.6.3
Timeline
Publicly disclosed
Aug 6, 2018
Last updated
Aug 4, 2026
Weakness Type
- CWE-400 Uncontrolled Resource Consumption
References
- advisoryRHSA-2018:2384
- advisoryRHSA-2018:2390
- advisoryRHSA-2018:2395
- advisoryRHSA-2018:2402
- advisoryRHSA-2018:2403
FAQ
Common Questions.
Linux kernel versions 4.9+ can be forced to make very expensive calls to tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() for every incoming packet which can lead to a denial of service.
Affected: Collaboration Meeting Rooms (Cisco) versions 1.0; Digital Network Architecture Center (Cisco) versions 1.2; Expressway Series (Cisco), among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including cluster-md-kmp-default 4.12.14-25.6.1, cluster-md-kmp-default 4.4.121-92.92.1, cluster-md-kmp-default 4.4.143-94.47.1.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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