CVE-2025-40266
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Publication date: 2025-12-04

Last updated on: 2025-12-04

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Check the untrusted offset in FF-A memory share Verify the offset to prevent OOB access in the hypervisor FF-A buffer in case an untrusted large enough value [U32_MAX - sizeof(struct ffa_composite_mem_region) + 1, U32_MAX] is set from the host kernel.
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Meta Information
Published
2025-12-04
Last Modified
2025-12-04
Generated
2026-06-16
AI Q&A
2025-12-04
EPSS Evaluated
2026-06-15
NVD
CVE-2025-40266
Affected Vendors & Products
Currently, no data is known.
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability in the Linux kernel's KVM on arm64 involves improper checking of an untrusted offset in the FF-A memory share. Specifically, the hypervisor did not properly verify the offset value, which could lead to out-of-bounds (OOB) access in the FF-A buffer if a large enough untrusted value is set from the host kernel.

Impact Analysis

The vulnerability could allow an attacker to cause out-of-bounds memory access in the hypervisor, potentially leading to memory corruption, crashes, or escalation of privileges within the virtualized environment.

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