CVE-2026-5265
Ovn: ovn: heap over-read in icmp error response generation - security issue
CVSS Score
6.5
EPSS Score
0.1%
EPSS Percentile
27th
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 |
| Vendor | red hat |
| Product | fast datapath for red hat enterprise linux 10 |
| Published | Apr 24, 2026 |
| Last Updated | Jun 1, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
High
Affected Versions
Red Hat / Fast Datapath for Red Hat Enterprise Linux 10
All versions affected Red Hat / Fast Datapath for Red Hat Enterprise Linux 10
All versions affected Red Hat / Fast Datapath for Red Hat Enterprise Linux 8
All versions affected Red Hat / Fast Datapath for Red Hat Enterprise Linux 8
All versions affected Red Hat / Fast Datapath for Red Hat Enterprise Linux 9
All versions affected Red Hat / Fast Datapath for Red Hat Enterprise Linux 9
All versions affected Red Hat / Fast Datapath for Red Hat Enterprise Linux 9
All versions affected Red Hat / Fast Datapath for Red Hat Enterprise Linux 9
All versions affected Red Hat / Fast Datapath for Red Hat Enterprise Linux 9
All versions affected Red Hat / Fast Datapath for RHEL 7
All versions affected Red Hat / Fast Datapath for RHEL 7
All versions affected Red Hat / Fast Datapath for RHEL 7
All versions affected Red Hat / Fast Datapath for RHEL 8
All versions affected Red Hat / Fast Datapath for RHEL 8
All versions affected Red Hat / Fast Datapath for RHEL 8
All versions affected Red Hat / Fast Datapath for RHEL 8
All versions affected Red Hat / Fast Datapath for RHEL 8
All versions affected Red Hat / Fast Datapath for RHEL 8
All versions affected Red Hat / Fast Datapath for RHEL 8
All versions affected Red Hat / Fast Datapath for RHEL 8
All versions affected Red Hat / Fast Datapath for RHEL 9
All versions affected Red Hat / Fast Datapath for RHEL 9
All versions affected Red Hat / Fast Datapath for RHEL 9
All versions affected Red Hat / Fast Datapath for RHEL 9
All versions affected Red Hat / Fast Datapath for RHEL 9
All versions affected Red Hat / Fast Datapath for RHEL 9
All versions affected Red Hat / Fast Datapath for RHEL 9
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2026:11694 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:11695 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:11696 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:11698 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:11700 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:11701 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:11702 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:22110 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:22111 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-5265 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2453458 openwall.com: http://www.openwall.com/lists/oss-security/2026/04/20/2 openwall.com: http://www.openwall.com/lists/oss-security/2026/04/20/4