What’s Vulnerable › Vulnerabilities

CVE-2025-40031: tee: fix register_shm_helper()

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-28 · updated 2026-10-19

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.

Affected products

• Linux kernel: 6.8 — fixed in 6.18

How to fix

Upgrade to a fixed version: Linux kernel 6.18. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/6a7874ab814ce12003c46a92f7afc9b035c8e8e9
• https://git.kernel.org/stable/c/9338093db954918558677a468d32e77041c65167
• https://git.kernel.org/stable/c/d5cf5b37064b1699d946e8b7ab4ac7d7d101814c

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