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The overflow happens due to an addition operation involving a user-controlled value parsed from the PE binary being used by Shim. This value is further used for memory allocation operations, leading to a heap-based buffer overflow. This flaw causes memory corruption and can lead to a crash or data integrity issues during the boot phase.", "A buffer overflow was found in Shim in the 32-bit system. The overflow happens due to an addition operation involving a user-controlled value parsed from the PE binary being used by Shim. This value is further used for memory allocation operations, leading to a heap-based buffer overflow. This flaw causes memory corruption and can lead to a crash or data integrity issues during the boot phase."], "mitigation": {"lang": "en:us", "value": "There's no available mitigation for this issue."}, "name": "CVE-2023-40548", "public_date": "2023-10-03T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-40548\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-40548"], "threat_severity": "Moderate", "upstream_fix": "shim 15.8"}