CVE-2026-5265
Last modified
CVE-2026-5265 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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.. EPSS estimates a 0.63% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Fast Datapath for Red Hat Enterprise Linux 10 | All versions |
| Red Hat | Fast Datapath for Red Hat Enterprise Linux 8 | All versions |
| Red Hat | Fast Datapath for Red Hat Enterprise Linux 9 | All versions |
| Red Hat | Fast Datapath for RHEL 7 | All versions |
| Red Hat | Fast Datapath for RHEL 8 | All versions |
| Red Hat | Fast Datapath for RHEL 9 | All versions |
References
Timeline
- Published
- Last Modified
- Status
- Awaiting Analysis
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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