DEBIAN-CVE-2026-85769

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    DEBIAN-CVE-2026-85769

    Published: 4 Sept 2026Last Modified: 9 Sept 2026
    Upstream:
    CVE-2026-85769

    Summary:

    Details: 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.

    References: https://security-tracker.debian.org/tracker/CVE-2026-85769

    Affected packages

    Package

    Name: libtpms

    Purl: pkg:deb/debian/libtpms?arch=source&distro=bookworm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    0.10.1-1
    0.10.1-2
    0.10.2-1
    0.10.2-2
    0.10.2-3
    0.10.2-4
    0.10.2-5

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    DEBIAN-CVE-2026-85769 | CVE-DB