CVE-2026-7328 Unverified AXI Address in Subsystem Mode Commands Enables Denial of Service
A privileged local attacker can cause denial of service in Caliptra Core Runtime Firmware by sending mailbox commands with unverified AXI addresses due to missing authorization checks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-7328?
CVE-2026-7328 is a medium-severity missing authorization vulnerability in Caliptra Core Runtime Firmware, published on 22 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Missing authorization in Caliptra Core Runtime Firmware (INVOKE_DPE_MLDSA87, CM_AES_GCM_DECRYPT_DMA, EXTERNAL_MAILBOX_CMD commands) in subsystem mode allows a privileged local attacker to cause a denial of service via mailbox commands containing unverified AXI addresses. The security impact beyond availability is integration-specific.
This issue affects Core Runtime Firmware: 2.1.0.
Weakness: CWE-862
Which versions are affected by CVE-2026-7328?
How do I fix CVE-2026-7328?
No fix has been published for CVE-2026-7328 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-7328 being exploited?
There is no known exploitation of CVE-2026-7328 in the wild and no public exploit code.
Sources
Also known as GHSA-c5v4-q445-wv84.