Andrei Lutas

Name of the Vulnerable Software and Affected Versions: Intel(R) Processors (affected versions not specified) Description: The issue concerns a load value injection in some Intel(R) Processors utilizing speculative execution, which may allow an authenticated user to potentially enable information disclosure via a side channel with local access. This could lead to the disclosure of protected information. The vulnerability exploits the speculative execution mechanism, potentially allowing attackers to bypass existing defenses and access sensitive data from Intel SGX enclaves and other processes. Recommendations: At the moment, there is no information about a newer version that contains a fix for this vulnerability.

The issue is related to Microarchitectural Fill Buffer Data Sampling (MFBDS), which may allow an authenticated user to potentially enable information disclosure via a side channel with local access. This is due to the speculative execution utilized by some microprocessors.

The issue is related to the x86 emulate function in Xen, which does not properly check supervisor mode permissions. This allows local HVM users to cause a denial of service, resulting in a guest crash, or gain guest kernel mode privileges. The exploitation vectors involve specific instructions, including `HLT`, `LGDT`, `LIDT`, or `LMSW`.

The issue is related to the x86 emulate function in Xen, which does not properly check supervisor mode permissions for certain instructions. This allows local HVM guest users to cause a denial of service, resulting in a guest crash, via unspecified vectors.