UBUNTU-CVE-2026-71968

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Source
https://ubuntu.com/security/CVE-2026-71968
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71968.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-71968
Upstream
Published
2026-08-10T19:17:00Z
Modified
2026-08-13T03:01:06.034311453Z
Severity
  • 6.7 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • 8.4 (High) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/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 8794043, contains a use-after-free vulnerability in the Trusted Application loader that allows attackers with the ability to load a signed Trusted Application to corrupt secure-world kernel memory by setting the TAFLAGCONCURRENT flag in a user TA signed header. Attackers can cause two concurrent sessions to operate on the same shared context without locking, corrupting the uctx->vminfo.regions list during memref parameter mapping and unmapping to free vmregion nodes still in use, resulting in a use-after-free in S-EL1 secure-world kernel memory.

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_version": "4.8.0-1",
            "binary_name": "optee-os"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71968.json"