CVE-2026-5265

Summary

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 Software

VendorProductVersion RangeStatus
Red HatFast Datapath for Red Hat Enterprise Linux 100:25.03.2-100.el10fdp < *unaffected
Red HatFast Datapath for Red Hat Enterprise Linux 100:25.09.2-103.el10fdp < *unaffected
Red HatFast Datapath for Red Hat Enterprise Linux 80:21.12.0-145.el8fdp < *unaffected
Red HatFast Datapath for Red Hat Enterprise Linux 80:23.06.4-30.el8fdp < *unaffected
Red HatFast Datapath for Red Hat Enterprise Linux 90:23.06.4-30.el9fdp < *unaffected
Red HatFast Datapath for Red Hat Enterprise Linux 90:23.09.6-16.el9fdp < *unaffected
Red HatFast Datapath for Red Hat Enterprise Linux 90:24.03.7-82.el9fdp < *unaffected
Red HatFast Datapath for Red Hat Enterprise Linux 90:25.03.2-100.el9fdp < *unaffected
Red HatFast Datapath for Red Hat Enterprise Linux 90:25.09.2-103.el9fdp < *unaffected

Weaknesses

  • CWE-130: Improper Handling of Length Parameter Inconsistency

Workarounds

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References