Bug 2569973 (CVE-2026-56435)

Summary: CVE-2026-56435 XmlCliCommonDxe: XmlCliCommonDxe: Privilege escalation via out-of-bounds write
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerability-draftAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in XmlCliCommonDxe within Intel server board Unified Extensible Firmware Interface (UEFI) firmware. An out-of-bounds memory write allows a local, highly privileged attacker to corrupt system memory. Successful exploitation enables privilege escalation and arbitrary code execution within System Management Mode (SMM), compromising the security and integrity of the host system.
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Description OSIDB Bzimport 2026-11-10 19:28:13 UTC 
Out-of-bounds write in the XmlCliCommonDxe for the Intel(R) Server Board D50DNP and Intel(R) Server Board M50FCP within Ring 0 UEFI may allow an escalation of privilege. Startup code and smm adversary with a privileged user combined with a high complexity attack may enable local code execution. This result may potentially occur via local access when attack requirements are present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (high), integrity (high) and availability (high) of the vulnerable system, resulting in subsequent system confidentiality (high), integrity (high) and availability (high) impacts.