{"id":"UBUNTU-CVE-2026-71968","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 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-\u003evm_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.","modified":"2026-08-13T03:01:06.034311453Z","published":"2026-08-10T19:17:00Z","upstream":["CVE-2026-71968"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-71968"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-71968"},{"type":"REPORT","url":"https://github.com/OP-TEE/optee_os/commit/8794043c4065c26a2b8b1313794ba5ba5f06d296"},{"type":"REPORT","url":"https://github.com/OP-TEE/optee_os/pull/7900"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/op-tee-os-use-after-free-via-trusted-application-loader-ta-flag-concurrent"}],"affected":[{"package":{"name":"optee-os","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/optee-os?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["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-2026-71968.json"}}],"schema_version":"1.9.0","severity":[{"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"}]}