CVE-2026-5265: Ovn: heap over-read in icmp error response generation
Red Hat · Fast Datapath for Red Hat Enterprise Linux 10
Vendor fix available · Affected: Red Hat Fast Datapath for Red Hat Enterprise Linux 10 · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 50% of scored CVEs
DescriptionCVE.org
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.
Affected products20
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- Red Hat · Fast Datapath for Red Hat Enterprise Linux 10Versions not stated
- Red Hat · Fast Datapath for Red Hat Enterprise Linux 10Versions not stated
- Red Hat · Fast Datapath for Red Hat Enterprise Linux 8Versions not stated
- Red Hat · Fast Datapath for Red Hat Enterprise Linux 8Versions not stated
- Red Hat · Fast Datapath for Red Hat Enterprise Linux 9Versions not stated
- Red Hat · Fast Datapath for Red Hat Enterprise Linux 9Versions not stated
- Red Hat · Fast Datapath for Red Hat Enterprise Linux 9Versions not stated
- Red Hat · Fast Datapath for Red Hat Enterprise Linux 9Versions not stated
- Red Hat · Fast Datapath for Red Hat Enterprise Linux 9Versions not stated
- Red Hat · Fast Datapath for RHEL 7Versions not stated
- Red Hat · Fast Datapath for RHEL 7Versions not stated
- Red Hat · Fast Datapath for RHEL 7Versions not stated
- Red Hat · Fast Datapath for RHEL 8Versions not stated
- Red Hat · Fast Datapath for RHEL 8Versions not stated
- Red Hat · Fast Datapath for RHEL 8Versions not stated
- Red Hat · Fast Datapath for RHEL 8Versions not stated
- Red Hat · Fast Datapath for RHEL 8Versions not stated
- Red Hat · Fast Datapath for RHEL 8Versions not stated
- Red Hat · Fast Datapath for RHEL 8Versions not stated
- Red Hat · Fast Datapath for RHEL 8Versions not stated
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- Red Hat
- Published
- April 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-5265 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.
References
- NVD entrynvd.nist.gov
- CVE recordcve.org
- Weakness CWE-130cwe.mitre.org
- Vendor advisoryaccess.redhat.com
- Vendor advisoryaccess.redhat.com
- Vendor advisoryaccess.redhat.com
- Vendor advisoryaccess.redhat.com
- Vendor advisoryaccess.redhat.com
- Vendor advisoryaccess.redhat.com
- Vendor advisoryaccess.redhat.com
- Vendor advisoryaccess.redhat.com
- Vendor advisoryaccess.redhat.com
- access.redhat.com/security/cve/CVE-2026-5265access.redhat.com
- Issue trackerbugzilla.redhat.com
- openwall.com/lists/oss-security/2026/04/20/2openwall.com
1 more reference is in the CVE record.