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Description

Missing cryptographic step in Caliptra Core Firmware (aes_256_gcm_update module) results in an incorrect GCM authentication tag. When the streaming AES-256-GCM API is used with empty AAD, the hardware GHASH accumulator state is not saved after the first update call, causing the final tag to exclude the first batch of processed ciphertext. Ciphertext produced by that call may be modified without the tag reflecting the change. This issue affects Core Runtime Firmware: from 2.0.0 through 2.0.1, 2.1.0.

PUBLISHED Reserved 2026-04-16 | Published 2026-06-23 | Updated 2026-06-24 | Assigner Caliptra




MEDIUM: 5.1CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N

Problem types

CWE-325 Missing Cryptographic Step

Product status

Default status
unaffected

2.0.0 (semver)
affected

2.1.0 (semver)
affected

2.0.2 (semver)
unaffected

2.1.1 (semver)
unaffected

Credits

NVIDIA Offensive Security Research (OSR) team finder

References

github.com/...tra-sw/security/advisories/GHSA-834g-h5x6-2hqr

cve.org (CVE-2026-6458)

nvd.nist.gov (CVE-2026-6458)

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