optee-os — security advisory

{
  "id": "deac8d20bfaee8dc69da675959e170bf2d1cf0265e361b9e158a0c531b44ba2a",
  "url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-71968",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "UBUNTU-CVE-2026-71968",
    "summary": "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 TA_FLAG_CONCURRENT 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->vm_info.regions list during memref parameter mapping and unmapping to free vm_region nodes still in use, resulting in a use-after-free in S-EL1 secure-world kernel memory.",
    "evidence": "osv:UBUNTU-CVE-2026-71968",
    "products": [
      {
        "name": {
          "value": "optee-os",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "4.8.0-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.10.0-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.10.0-2",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "optee-os",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "4.7.0-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "4.8.0-1",
            "evidence": "/affected/1/versions"
          }
        ]
      }
    ],
    "severity": "high",
    "structured": {
      "id": "UBUNTU-CVE-2026-71968",
      "aliases": [
        "UBUNTU-CVE-2026-71968"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H"
        },
        {
          "type": "CVSS_V4",
          "score": "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"
        },
        {
          "type": "Ubuntu",
          "score": "medium"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "optee-os",
            "purl": "pkg:deb/ubuntu/optee-os?arch=source&distro=stonking",
            "ecosystem": "Ubuntu:26.10"
          },
          "versions": [
            "4.8.0-1",
            "4.10.0-1",
            "4.10.0-2"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71968.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "optee-os",
                "binary_version": "4.10.0-2"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "optee-os",
            "purl": "pkg:deb/ubuntu/optee-os?arch=source&distro=resolute",
            "ecosystem": "Ubuntu:26.04:LTS"
          },
          "versions": [
            "4.7.0-1",
            "4.8.0-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71968.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "optee-os",
                "binary_version": "4.8.0-1"
              }
            ]
          }
        }
      ],
      "modified": "2026-10-17T13:00:47.561134395Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-71968"
      ],
      "references": [
        "https://ubuntu.com/security/CVE-2026-71968",
        "https://www.cve.org/CVERecord?id=CVE-2026-71968",
        "https://github.com/OP-TEE/optee_os/commit/8794043c4065c26a2b8b1313794ba5ba5f06d296",
        "https://github.com/OP-TEE/optee_os/pull/7900",
        "https://www.vulncheck.com/advisories/op-tee-os-use-after-free-via-trusted-application-loader-ta-flag-concurrent"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-71968",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/1/score"
  },
  "source_id": "core-osv",
  "document_id": 360842,
  "published_at": "2026-08-10T19:17:00+00:00"
}