CVE-2026-85769
MediumCVSS 6.5Exploitation Probability (EPSS)
Low risk37th percentile - higher than 37% of all known CVEs
Summary
In the libtpms library, which provides software TPM 2.0 emulation, when restoring TPM 2.0 state (e.g., during VM power-on or migration restore), a malformed state blob can supply an oversized skip-block length that is not validated against the remaining size of the input buffer. This can drive an internal size counter negative, bypassing a subsequent bounds check due to an unsafe signed-to-unsigned conversion, causing the parser to read memory outside the bounds of the heap buffer holding the state data. Successful exploitation can crash the process hosting libtpms (such as swtpm), resulting in a denial of service of the emulated TPM device and the virtual machine that depends on it. No data corruption or information disclosure was confirmed.
Risk Assessment
The vulnerability can lead to a crash of the swtpm process, resulting in denial of service for virtual machines using the emulated TPM. This may disrupt critical virtualized systems.
Recommendation
Update libtpms to a patched version and monitor for errors in swtpm processes. Also restrict trust in TPM state blobs from unverified sources.
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Original NVD description (English source)
A flaw was found in libtpms, a library that provides software TPM 2.0 emulation. When restoring TPM 2.0 state (for example during a virtual machine's power-on or state/migration restore), a malformed state blob can supply an oversized skip-block length that is not validated against the remaining size of the input buffer. This can drive an internal size counter negative, which bypasses a subsequent bounds check due to an unsafe signed-to-unsigned conversion, causing the parser to read memory outside the bounds of the heap buffer holding the state data. Successful exploitation can crash the process hosting libtpms (such as swtpm), resulting in a denial of service of the emulated TPM device and the virtual machine that depends on it. No data corruption or information disclosure was confirmed.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

