Executive Summary

This vulnerability exists in the Linux kernel's drm/komeda component, specifically in the AFBC framebuffer size check. The issue is due to an integer overflow when calculating the minimum required buffer size by adding the AFBC payload size to the framebuffer offset without verifying if the addition overflows.

If an overflow occurs, the size check may incorrectly succeed, allowing userspace to provide an undersized drm_gem_object. This can potentially lead to out-of-bounds memory access.

The fix involves using a safe addition function, check_add_overflow(), to detect and reject any framebuffer sizes that cause an overflow, making the validation more robust against malformed inputs.

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Impact Analysis

This vulnerability can lead to out-of-bounds memory access in the Linux kernel's graphics subsystem. Such memory access issues can cause system instability, crashes, or potentially allow an attacker to execute arbitrary code or escalate privileges by exploiting the memory corruption.

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Mitigation Strategies

The vulnerability has been resolved by adding a check for integer overflow in the AFBC framebuffer size validation within the Linux kernel. To mitigate this vulnerability, you should update your Linux kernel to a version that includes this fix.

• Apply the latest Linux kernel updates or patches that address the drm/komeda integer overflow issue.
• Avoid using vulnerable kernel versions that do not include the check_add_overflow() safeguard in the AFBC framebuffer size calculation.

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