CVE-2026-7328
Unverified AXI Address in Subsystem Mode Commands Enables Denial of Service
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.
INFO
Published Date :
July 22, 2026, 5:16 p.m.
Last Modified :
July 22, 2026, 5:16 p.m.
Remotely Exploit :
No
Source :
b01ddd03-5ef6-483b-b2c5-acba77f1a554
Affected Products
The following products are affected by CVE-2026-7328
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | MEDIUM | b01ddd03-5ef6-483b-b2c5-acba77f1a554 | ||||
| CVSS 4.0 | MEDIUM | b01ddd03-5ef6-483b-b2c5-acba77f1a554 |
Solution
- Update Caliptra Core Runtime Firmware to the latest version.
- Verify all mailbox commands for proper authorization.
- Ensure AXI addresses are validated before processing.
- Limit privileged access to the subsystem.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-7328.
| URL | Resource |
|---|---|
| https://github.com/chipsalliance/caliptra-sw/security/advisories/GHSA-c5v4-q445-wv84 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-7328 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-7328
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-7328 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-7328 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by b01ddd03-5ef6-483b-b2c5-acba77f1a554
Jul. 22, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Caliptra', 'modules': ['INVOKE_DPE_MLDSA87', 'CM_AES_GCM_DECRYPT_DMA', 'EXTERNAL_MAILBOX_CMD'], 'product': 'Core Runtime Firmware', 'versions': [{'status': 'affected', 'version': '2.1.0', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '2.1.1', 'versionType': 'semver'}], 'packageName': 'Core Runtime Firmware', 'collectionURL': 'https://github.com/chipsalliance/caliptra-sw', 'defaultStatus': 'unaffected'}] Added 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. Added CVSS V4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-862 Added Reference https://github.com/chipsalliance/caliptra-sw/security/advisories/GHSA-c5v4-q445-wv84