CVE-2026-82926: Samsung mTower NULL pointer dereference in TEE invoke

CVE-2026-82926 · Severity: medium · CVSS 5.5 · Published 2026-09-01

mTower is Samsung's trusted execution environment (TEE) for Arm processors, used to run sensitive operations in isolation from the main OS. A vulnerability allows an attacker on the normal (non-secure) system to crash the TEE and deny service by sending a specially crafted ioctl call with an invalid session identifier, exploiting missing null-pointer validation in the TEE's invoke handler.

Technologies: Samsung mTower. Vendors: Samsung.

Quick answers

Is CVE-2026-82926 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-82926 being exploited in the wild.
How severe is CVE-2026-82926?
Medium severity, with a CVSS score of 5.5, published 1 September 2026.
Which products and versions are affected?
Samsung mTower before afef59aa6f55c5d5ebf9b14bc020bf1c2c37489a.
Is there a fix for CVE-2026-82926?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-82926 attacked?
It is attacked with local access, in device firmware.
Am I affected by CVE-2026-82926?
Check whether you run Samsung mTower at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A NULL pointer dereference vulnerability exists in the tee_ioctl_invoke() function within tee/kernel/entry_std.c. The vulnerability occurs because the function does not validate the return value from tee_ta_get_session() before passing the session pointer to tee_ta_invoke_command(), which unconditionally dereferences it via sess->ctx->ops->enter_invoke_cmd(). An unauthenticated local attacker can trigger this by sending TEE_IOC_INVOKE ioctl calls with invalid, zero, or stale session identifiers, causing a NULL pointer dereference in the secure world and resulting in denial of service. The attack is reachable through the live cmse_nonsecure_entry ioctl veneer and requires no special privileges. The fix, merged in commit afef59aa6f55c5d5ebf9b14bc020bf1c2c37489a, adds proper null-pointer checks to reject invalid sessions.

Affected products

  • Samsung mTower before afef59aa6f55c5d5ebf9b14bc020bf1c2c37489a

Timeline

  • 2026-09-01: disclosed

References

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