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Fencer Intel
medium 5.6

CVE-2026-18448 json

Leak SMM RAM from the kernel (Simply TSA after an SMI)

published 2d ago modified yesterday also EUVD-2026-122789 , GHSA-7v86-66vf-h88j

Unreviewed: the maintainers' own advisory

Published by the maintainers on their GitHub repository tianocore/edk2. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.

cvss
5.6
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 2%
public exploits
0
none known

Summary

EDK2 contains a vulnerability in BIOS where a privileged attacker may cause “Exposure of Sensitive Information during Transient Execution” by local access. Successful exploitation of this vulnerability may result in disclosure of SMRAM contents. It could also impact Confidentiality.

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Exploit prediction

0.13% chance of exploitation in the next 30 days, higher than 2% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 4.0 5.6 CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CNA 4.0 5.6 CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • TianoCore EDK2

Classification

Weakness
  • CWE-1420 Exposure of Sensitive Information during Transient Execution

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of tianocore/edk2 published their own advisory on GitHub. Reviewed sources take precedence over it.