Out-of-bounds Read Affecting libtpms package, versions *


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.42% (34th percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-LIBTPMS-19540200
  • published5 Sept 2026
  • disclosed4 Sept 2026

Introduced: 4 Sep 2026

CVE-2026-85769  (opens in a new tab)
CWE-125  (opens in a new tab)

How to fix?

There is no fixed version for Debian:unstable libtpms.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libtpms package and not the libtpms package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1