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CVE-2026-5367 is an out-of-bounds read / heap over-read vulnerability in OVN (Open Virtual Network), specifically in ovn-controller's DHCPv6 processing path in the userspace pinctrl thread. When handling a DHCPv6 SOLICIT message and constructing a DHCPv6 ADVERTISE reply, the vulnerable code echoes the Client ID option back to the requester using the option length declared in the attacker-controlled DHCPv6 option header without validating that the declared length fits within the actual received packet bounds. As described in the supporting content, the vulnerable copy operation used attacker-influenced length data when copying the Client ID option, allowing a crafted SOLICIT packet with an inflated Client ID length to make ovn-controller read past the end of the packet buffer and copy adjacent heap memory into the reply. The issue affects OVN deployments where DHCPv6 options are configured on logical switch ports, making the DHCPv6 server code path reachable from attached workloads or tenant VMs.
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No public exploit code observed for this vulnerability.
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8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An out-of-bounds read information disclosure vulnerability in OVN's ovn-controller triggered by crafted DHCPv6 SOLICIT packets with an inflated Client ID length.
A heap over-read information disclosure vulnerability in OVN's DHCPv6 Client ID option processing within ovn-controller/pinctrl, where attacker-controlled option length fields can cause out-of-bounds reads and leak heap memory back to a tenant VM.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.