UBUNTU-CVE-2026-75900

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Source
https://ubuntu.com/security/CVE-2026-75900
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-75900.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-75900
Upstream
  • CVE-2026-75900
Published
2026-08-19T08:17:00Z
Modified
2026-09-11T20:53:36Z
Severity
  • 6.1 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

An out-of-bounds read vulnerability was found in swtpm's SWTPM_NVRAM_CheckHeader() function. The entry guard checks the buffer length against sizeof(bh), where bh is a pointer, instead of sizeof(*bh), the actual struct size. This allows an undersized buffer to pass validation, causing a 2-byte heap overread on 64-bit systems (6 bytes on 32-bit) when accessing the totlen field. This may cause daemon termination on some platforms and leaks heap data to the log.

References

Affected packages

Ubuntu:22.04:LTS / swtpm

Package

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

Affected ranges

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

Affected versions

0.*
0.6.1-0ubuntu1
0.6.1-0ubuntu2
0.6.1-0ubuntu3
0.6.1-0ubuntu4
0.6.1-0ubuntu5
0.6.3-0ubuntu1
0.6.3-0ubuntu2
0.6.3-0ubuntu3
0.6.3-0ubuntu3.1
0.6.3-0ubuntu3.2
0.6.3-0ubuntu3.3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "swtpm",
            "binary_version": "0.6.3-0ubuntu3.3"
        },
        {
            "binary_name": "swtpm-tools",
            "binary_version": "0.6.3-0ubuntu3.3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-75900.json"

Ubuntu:24.04:LTS / swtpm

Package

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

Affected ranges

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

Affected versions

0.*
0.7.3-0ubuntu2
0.7.3-0ubuntu3
0.7.3-0ubuntu5
0.7.3-0ubuntu5.24.04.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "swtpm",
            "binary_version": "0.7.3-0ubuntu5.24.04.1"
        },
        {
            "binary_name": "swtpm-tools",
            "binary_version": "0.7.3-0ubuntu5.24.04.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-75900.json"

Ubuntu:26.04:LTS / swtpm

Package

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

Affected ranges

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

Affected versions

0.*
0.7.3-0ubuntu8
0.7.3-0ubuntu9
0.10.1+ds-1ubuntu2
0.10.1+ds-1ubuntu3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "swtpm",
            "binary_version": "0.10.1+ds-1ubuntu3"
        },
        {
            "binary_name": "swtpm-libs",
            "binary_version": "0.10.1+ds-1ubuntu3"
        },
        {
            "binary_name": "swtpm-tools",
            "binary_version": "0.10.1+ds-1ubuntu3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-75900.json"