CVE-2026-5265— Ovn: ovn: heap over-read in icmp error response generation - security issue
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I. Basic Information for CVE-2026-5265
Vulnerability Information
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Vulnerability Title
Ovn: ovn: heap over-read in icmp error response generation - security issue
Source: NVD (National Vulnerability Database)
Vulnerability Description
When generating an ICMP Destination Unreachable or Packet Too Big response, the handler copies a portion of the original packet into the ICMP error body using the IP header's self-declared total length (ip_tot_len for IPv4, ip6_plen for IPv6) without validating it against the actual packet buffer size. A VM can send a short packet with an inflated IP length field that triggers an ICMP error (e.g., by hitting a reject ACL), causing ovn-controller to read heap memory beyond the valid packet data and include it in the ICMP response sent back to the VM.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
长度参数不一致性处理不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
OVN 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OVN是OVN开源的一个基于虚拟网络技术的数据中心网络虚拟化平台。 OVN存在安全漏洞，该漏洞源于生成ICMP错误响应时未验证IP头声明的总长度与实际数据包缓冲区大小，可能导致虚拟机发送短数据包触发ICMP错误，造成ovn-controller读取堆内存越界数据并包含在ICMP响应中。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Red Hat | Fast Datapath for Red Hat Enterprise Linux 8 | 0:21.12.0-145.el8fdp ~ * | cpe:/o:redhat:enterprise_linux:8::fastdatapath | |
| Red Hat | Fast Datapath for Red Hat Enterprise Linux 8 | 0:23.06.4-30.el8fdp ~ * | cpe:/o:redhat:enterprise_linux:8::fastdatapath | |
| Red Hat | Fast Datapath for Red Hat Enterprise Linux 9 | 0:23.06.4-30.el9fdp ~ * | cpe:/o:redhat:enterprise_linux:9::fastdatapath | |
| Red Hat | Fast Datapath for Red Hat Enterprise Linux 9 | 0:23.09.6-16.el9fdp ~ * | cpe:/o:redhat:enterprise_linux:9::fastdatapath | |
| Red Hat | Fast Datapath for Red Hat Enterprise Linux 9 | 0:24.03.7-82.el9fdp ~ * | cpe:/o:redhat:enterprise_linux:9::fastdatapath | |
| Red Hat | Fast Datapath for Red Hat Enterprise Linux 9 | 0:25.03.2-100.el9fdp ~ * | cpe:/o:redhat:enterprise_linux:9::fastdatapath | |
| Red Hat | Fast Datapath for Red Hat Enterprise Linux 9 | 0:25.09.2-103.el9fdp ~ * | cpe:/o:redhat:enterprise_linux:9::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 10 | - | cpe:/o:redhat:enterprise_linux:10::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 10 | - | cpe:/o:redhat:enterprise_linux:10::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 7 | - | cpe:/o:redhat:enterprise_linux:7::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 7 | - | cpe:/o:redhat:enterprise_linux:7::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 7 | - | cpe:/o:redhat:enterprise_linux:7::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 8 | - | cpe:/o:redhat:enterprise_linux:8::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 8 | - | cpe:/o:redhat:enterprise_linux:8::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 8 | - | cpe:/o:redhat:enterprise_linux:8::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 8 | - | cpe:/o:redhat:enterprise_linux:8::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 8 | - | cpe:/o:redhat:enterprise_linux:8::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 8 | - | cpe:/o:redhat:enterprise_linux:8::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 8 | - | cpe:/o:redhat:enterprise_linux:8::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 8 | - | cpe:/o:redhat:enterprise_linux:8::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 9 | - | cpe:/o:redhat:enterprise_linux:9::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 9 | - | cpe:/o:redhat:enterprise_linux:9::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 9 | - | cpe:/o:redhat:enterprise_linux:9::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 9 | - | cpe:/o:redhat:enterprise_linux:9::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 9 | - | cpe:/o:redhat:enterprise_linux:9::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 9 | - | cpe:/o:redhat:enterprise_linux:9::fastdatapath | |
| Red Hat | Fast Datapath for RHEL 9 | - | cpe:/o:redhat:enterprise_linux:9::fastdatapath |
II. Public POCs for CVE-2026-5265
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
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V. Comments for CVE-2026-5265
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