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CVE-2026-97631— Pre-boot RCE in EDK II PXE driver

Quick assessment

Affected
TianoCore EDK2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

EDK2 的 BIOS 中存在一个漏洞，攻击者可通过远程访问触发“越界写入”、经典缓冲区溢出以及“缓冲区大小计算错误”。成功利用该漏洞可导致任意代码执行，并可能影响系统的机密性、完整性和可用性。

CVSS 9.5 · Critical

Affected Version Matrix 1

VendorProduct Version RangeStatus
TianoCore EDK2 ≤ edk2-stable202608 affected
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I. Basic Information for CVE-2026-97631

Vulnerability Information
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Vulnerability Title
Pre-boot RCE in EDK II PXE driver
Source: CVE Program / CVE List V5
Vulnerability Description
EDK2 contains a vulnerability in BIOS where a user may cause “Out-of-bounds Write”, Classic Buffer Overflow, and “Incorrect Calculation of Buffer Size” by remote access. Successful exploitation of this vulnerability can lead to arbitrary code execution. It could also impact Confidentiality, Integrity, and Availability.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
TianoCore EDK2 0 ~ edk2-stable202608 -

II. Public POCs for CVE-2026-97631

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III. Intelligence Information for CVE-2026-97631

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Vendor Advisories for CVE-2026-97631 (1)

IV. Related Vulnerabilities

Same product: EDK2
Same vendor: TianoCore
Same weakness: CWE-120

V. Comments for CVE-2026-97631

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