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.
Problem types
Improper Handling of Length Parameter Inconsistency
Product status
0:21.12.0-145.el8fdp (rpm) before *
0:23.06.4-30.el9fdp (rpm) before *
0:25.09.2-103.el9fdp (rpm) before *
Timeline
| 2026-03-24: | Reported to Red Hat. |
| 2026-04-06: | Made public. |
References
www.openwall.com/lists/oss-security/2026/04/20/2
www.openwall.com/lists/oss-security/2026/04/20/4
access.redhat.com/errata/RHSA-2026:11694 (RHSA-2026:11694)
access.redhat.com/errata/RHSA-2026:11696 (RHSA-2026:11696)
access.redhat.com/errata/RHSA-2026:11702 (RHSA-2026:11702)
access.redhat.com/security/cve/CVE-2026-5265
bugzilla.redhat.com/show_bug.cgi?id=2453458 (RHBZ#2453458)