Intel Q35, GM45, PM45 Express, Q45, and Q43 Express chipsets in the SINIT Authenticated Code Module (ACM), which allows local users to bypas
Intel Q35, GM45, PM45 Express, Q45, and Q43 Express chipsets in the SINIT Authenticated Code Module (ACM), which allows local users to bypass the Trusted Execution Technology protection mechanism and gain privileges by modifying the MCHBAR register to point to an attacker-controlled region, which prevents the SENTER instruction from properly applying VT-d protection while an MLE is being loaded.
- Published
- Dec 24, 2009
- Updated
- Jun 16, 2026
- EPSS
- 0.4% · 34th percentile
- CWE
- CWE-16
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Report tools
Action score
28
Monitor
Low priority for now.
- CVSS
- 28 / 40 · 7.2 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.4%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| intel | gm45 chipset | cpe:2.3:h:intel:gm45_chipset |
| intel | pm45 express chipset | cpe:2.3:h:intel:pm45_express_chipset |
| intel | q35 chipset | cpe:2.3:h:intel:q35_chipset |
| intel | q43 express chipset | cpe:2.3:h:intel:q43_express_chipset |
| intel | q45 chipset | cpe:2.3:h:intel:q45_chipset |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- intel gm45 chipsetall versions
- intel pm45 express chipsetall versions
- intel q35 chipsetall versions
- intel q43 express chipsetall versions
- intel q45 chipsetall versions
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
No fix version is recorded for this entry. Check the references for vendor advisories.
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.
Technical details
Attack conditions
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- C · data can be read
- Integrity
- C · data or configuration can be modified
- Availability
- C · the service can be disrupted
- Attack complexity
- Low
- Confidentiality impact
- C
- Integrity impact
- C
- Availability impact
- C
Weakness class (CWE)
CWE-16 · ConfigurationCVSS vector
AV:L/AC:L/Au:N/C:C/I:C/A:C
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.
References
- invisiblethingslab.com/resources/misc09/Another%20TXT%20Attack.pdf
- osvdb.org/61248
- secunia.com/advisories/37900
- security-center.intel.com/advisory.aspx?intelid=INTEL-SA-00021&languageid=en-fr
- theinvisiblethings.blogspot.com/2009/12/another-txt-attack.html
- www.securityfocus.com/bid/37430
- www.securitytracker.com/id?1023382
- www.vupen.com/english/advisories/2009/3618
- exchange.xforce.ibmcloud.com/vulnerabilities/54963
Vendor advisories and official records. Exploit/PoC links are deliberately left out.