CVE-2026-5367 Ovn: ovn: information disclosure via crafted dhcpv6 packets
Remote attackers can send crafted DHCPv6 packets to trigger an out-of-bounds read in OVN, disclosing sensitive heap memory contents.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-5367?
CVE-2026-5367 is a high-severity vulnerability in Red Hat Fast Datapath for RHEL 8, published on 24 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A flaw was found in OVN (Open Virtual Network). A remote attacker, by sending crafted DHCPv6 (Dynamic Host Configuration Protocol for IPv6) SOLICIT packets with an inflated Client ID length, could cause the ovn-controller to read beyond the bounds of a packet. This out-of-bounds read can lead to the disclosure of sensitive information stored in heap memory, which is then returned to the attacker's virtual machine port.
Weakness: CWE-130
Which versions are affected by CVE-2026-5367?
How do I fix CVE-2026-5367?
Apply the vendor's patch.
Is CVE-2026-5367 being exploited?
There is no known exploitation of CVE-2026-5367 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-5367, GHSA-r8vj-9qgr-m84x, UBUNTU-CVE-2026-5367.