CVE-2026-5265

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.

The following products are affected by CVE-2026-5265 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-5265.

URL	Resource
http://www.openwall.com/lists/oss-security/2026/04/20/2
http://www.openwall.com/lists/oss-security/2026/04/20/4
https://access.redhat.com/security/cve/CVE-2026-5265
https://bugzilla.redhat.com/show_bug.cgi?id=2453458
https://nvd.nist.gov/vuln/detail/CVE-2026-5265
https://www.cve.org/CVERecord?id=CVE-2026-5265