CVE-2026-5265

medium Red Hat
CVSS v3 Base Score
6.5
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H
EPSS Score
0.1%
Exploitation probability in 30 days
Top 73% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Confidentiality
Low
Integrity
None
Availability
High
Published: April 6, 2026 (95 days ago)
Last Modified: April 6, 2026
Vendor: Red Hat
Fix Available: ✓ Yes
Source: REDHAT

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.

CWE

CWE-130

Affected Products

Fast Datapath for RHEL 10Fast Datapath for RHEL 7Fast Datapath for RHEL 8Fast Datapath for RHEL 9Fast Datapath for Red Hat Enterprise Linux 8Fast Datapath for Red Hat Enterprise Linux 9

Fix Status

✅ Fix Available

References

🔗 bugzilla.redhat.com 🔗 www.cve.org 🔗 nvd.nist.gov