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Change History

http://www.openwall.com/lists/oss-security/2026/04/20/2

http://www.openwall.com/lists/oss-security/2026/04/20/4

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.

AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H

CWE-130

https://access.redhat.com/security/cve/CVE-2026-5265

https://bugzilla.redhat.com/show_bug.cgi?id=2453458