altera-cvp Out-of-Bounds Read in Linux Kernel

Executive Summary

This vulnerability is in the Linux kernel's FPGA driver for Altera CVP devices. It involves an out-of-bounds read when writing trailing bytes of data. The function altera_cvp_send_block() incorrectly reads a 32-bit value even when only 1-3 bytes remain in the input buffer, which can cause a memory access fault if the buffer ends at a page or scatterlist boundary.

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Detection Guidance

This vulnerability is specific to the Linux kernel's FPGA altera-cvp driver and involves out-of-bounds memory reads during buffer handling. Detection requires checking kernel logs for errors related to altera-cvp or FPGA operations. Commands like dmesg | grep altera or journalctl -k | grep altera may help identify issues. Ensure your kernel version is updated to a patched release.

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Impact Analysis

This vulnerability could lead to system crashes or instability if exploited. It may allow unauthorized memory access, potentially causing denial-of-service conditions or unexpected behavior in systems using Altera CVP FPGA devices.

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Compliance Impact

This vulnerability does not directly affect compliance with GDPR, HIPAA, or similar standards as it is a low-level kernel issue related to memory access in FPGA driver code. Compliance impacts would depend on system-specific implementations and data handling practices rather than this specific vulnerability.

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Mitigation Strategies

Update your Linux kernel to the latest stable version that includes the fix for CVE-2026-89730. If immediate patching is not possible, disable the altera-cvp driver if not in use by blacklisting the module or restricting FPGA operations.

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