BaseFortify

Publication date: 2025-10-28

Last updated on: 2025-10-30

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: tee: fix register_shm_helper() In register_shm_helper(), fix incorrect error handling for a call to iov_iter_extract_pages(). A case is missing for when iov_iter_extract_pages() only got some pages and return a number larger than 0, but not the requested amount. This fixes a possible NULL pointer dereference following a bad input from ioctl(TEE_IOC_SHM_REGISTER) where parts of the buffer isn't mapped.

CVSS Scores

EPSS Scores

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Meta Information

Published

2025-10-28

Last Modified

2025-10-30

Generated

2026-07-06

AI Q&A

2025-10-28

EPSS Evaluated

2026-07-05

NVD

CVE-2025-40031

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability is in the Linux kernel's TEE (Trusted Execution Environment) subsystem, specifically in the register_shm_helper() function. The issue is due to incorrect error handling when calling iov_iter_extract_pages(). The function did not properly handle the case where iov_iter_extract_pages() returns a positive number that is less than the requested amount of pages, which can lead to a NULL pointer dereference if parts of the buffer are not mapped correctly after a bad input from ioctl(TEE_IOC_SHM_REGISTER).

Impact Analysis

The vulnerability can cause a NULL pointer dereference in the Linux kernel, which may lead to a kernel crash or system instability. This could potentially be exploited to cause denial of service or other unintended behavior in systems using the affected TEE subsystem.

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