Out-of-Bounds Read in TCG TPM 2.0 CryptHmacSign
CVE-2025-2884 is an out-of-bounds read vulnerability in the Trusted Computing Group (TCG) TPM 2.0 reference implementation, specifically in the CryptHmacSign helper function. The flaw is caused by insufficient validation that the selected signature scheme is compatible with the signature key's algorithm. When a malformed or incompatible signing request is processed, the TPM implementation can read memory outside the intended bounds. The issue is documented in TCG TPM 2.0 Errata Revision 1.83 and advisory TCGVRT0009. Affected implementations include TPM 2.0 reference-library-derived code prior to the corrected errata, and downstream vendor implementations may inherit the flaw depending on how closely they track the reference implementation.
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Impact
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Mitigation
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Remediation
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Exploits
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No public exploit code observed for this vulnerability.
Affected products & vendors
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Recent activity
14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Out-of-bounds read in the TCG TPM 2.0 reference implementation (CryptHmacSign helper) that can cause information disclosure or denial of service.
A publicly disclosed vulnerability affecting TPM 2.0 (as described in the article).
Out-of-bounds read in the TPM2.0 reference implementation (CryptHmacSign helper) that could enable secret theft; publicly known per the content.
An out-of-bounds read (CWE-125) in the TCG TPM2.0 reference implementation's CryptHmacSign helper function caused by missing validation of the signature scheme against the signature key's algorithm.
The version that knows your environment.
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.