CVE-2026-71967

OP-TEE OS 4.10.0 NULL Pointer Dereference DoS via Widevine PTA open_session

5.7 Medium

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

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

0.17%Up 0.1 points since Aug 11, 2026

What each source reports

CVE List Score used 5.7

OP-TEE OS 4.10.0 NULL Pointer Dereference DoS via Widevine PTA open_session

Record: CVE-2026-71967
CVSS 4.0: 5.7 MediumCVSS: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 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-476
Updated: 2026-11-02

EUVDEUVD-2026-55696 5.7

Record: EUVD-2026-55696
CVSS 4.0: 5.7 MediumCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-cg97-7v4v-qg3v 5.7

OP-TEE OS through 4.10.0, fixed in commit 0aadfc2, contains a null pointer dereference...

Record: GHSA-cg97-7v4v-qg3v
CVSS 4.0: 5.7 MediumCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-476
Updated: 2026-11-02

NVD 5.7

Record: CVE-2026-71967
CVSS 4.0: 5.7 MediumCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-476
Updated: 2026-11-02

OSV 5.7

OP-TEE OS 4.10.0 NULL Pointer Dereference DoS via Widevine PTA open_session

Record: CVE-2026-71967
CVSS 4.0: 5.7 MediumCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness: CWE-476
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-71967 5.7

Record: DEBIAN-CVE-2026-71967
CVSS 4.0: 5.7 MediumCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-71967 5.7

Record: UBUNTU-CVE-2026-71967
CVSS 4.0: 5.7 MediumCVSS: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 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

Affected products

op-tee optee os

Affected packages

Affected packages
Package	Affected	Fixed
`optee-os` Debian:13	All versions, plus listed versions 4.10.0-14.10.0-24.5.0-24.7.0-14.8.0-14.9.0-1	None known
`optee-os` Ubuntu:26.10	All versions, plus listed versions 4.8.0-14.10.0-14.10.0-2	None known
`optee-os` Ubuntu:26.04:LTS	All versions, plus listed versions 4.7.0-14.8.0-1	None known

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-71967 is a medium vulnerability (CVSS 5.7) in Op-tee Optee Os, published August 10, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.17%, the 6th percentile. No source names a fixed version.

References

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