UBUNTU-CVE-2026-85769

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/CVE-2026-85769
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-85769.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2026-85769
Upstream
Published
2026-09-04T18:18:00Z
Modified
2026-09-16T14:02:38Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
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

Affected packages

Ubuntu:22.04:LTS / libtpms

Package

Name
libtpms
Purl
pkg:deb/ubuntu/libtpms?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.8.2-1ubuntu1
0.9.0-0ubuntu1
0.9.0-0ubuntu2
0.9.0-0ubuntu3
0.9.0-0ubuntu4
0.9.3-0ubuntu1
0.9.3-0ubuntu1.22.04.1
0.9.3-0ubuntu1.22.04.2

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libtpms0",
            "binary_version":  "0.9.3-0ubuntu1.22.04.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-85769.json"

Ubuntu:24.04:LTS / libtpms

Package

Name
libtpms
Purl
pkg:deb/ubuntu/libtpms?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.9.3-0ubuntu2
0.9.3-0ubuntu3
0.9.3-0ubuntu4
0.9.3-0ubuntu4.24.04.1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libtpms0",
            "binary_version":  "0.9.3-0ubuntu4.24.04.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-85769.json"

Ubuntu:26.04:LTS / libtpms

Package

Name
libtpms
Purl
pkg:deb/ubuntu/libtpms?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.9.3-0ubuntu5
0.10.1-2ubuntu1
0.10.2-1ubuntu1
0.10.2-2ubuntu1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libtpms0",
            "binary_version":  "0.10.2-2ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-85769.json"