UBUNTU-CVE-2026-71967

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Source
https://ubuntu.com/security/CVE-2026-71967
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71967.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-71967
Upstream
Published
2026-08-10T19:17:00Z
Modified
2026-08-13T03:01:05.318905150Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • 5.7 (Medium) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

OP-TEE OS through 4.10.0, fixed in commit 0aadfc2, contains a null pointer dereference vulnerability in the Widevine pseudo-TA opensession handler that allows Normal World clients to cause a denial of service when CFGWIDEVINEPTA is enabled. Attackers can open a session directly on the Widevine PTA to trigger an unconditional dereference of a NULL calling session pointer via isusertactx(), faulting the TEE at S-EL1 and crashing the trusted execution environment.

References

Affected packages

Ubuntu:26.04:LTS / optee-os

Package

Name
optee-os
Purl
pkg:deb/ubuntu/optee-os?arch=source&distro=resolute

Affected ranges

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

Affected versions

4.*
4.7.0-1
4.8.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "optee-os",
            "binary_version": "4.8.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71967.json"