TianoCore Edk2 up to edk2-stable202608 SMM out-of-bounds write

Summaryinfo

A vulnerability marked as very critical has been reported in TianoCore Edk2 up to edk2-stable202608. This issue affects some unknown processing of the component SMM Handler. The manipulation leads to out-of-bounds write. This vulnerability is uniquely identified as CVE-2026-14968. Local access is required to approach this attack. No exploit exists.

Detailsinfo

A vulnerability, which was classified as very critical, has been found in TianoCore Edk2 up to edk2-stable202608. This issue affects an unknown code of the component SMM Handler. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. Using CWE to declare the problem leads to CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

EDK2 contains vulnerabilities in BIOS where skilled and privileged users or attackers may cause “Out-of-bounds Write” by local access. Successful exploitation of this vulnerability could compromise SMM handler integrity, cause system instability, and lead to denial of service. It could also impact Integrity and Availability.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-14968 since 07/07/2026. The exploitation is known to be easy. Attacking locally is a requirement. Additional levels of successful authentication are required for exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/10/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• TianoCore

Name

• Edk2

Version

• edk2-stable202608

Website

• Product: https://github.com/tianocore/edk2/

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