CVE-2020-24455

Severity: medium (CVSS 6.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-02-26 · updated 2026-06-17
Weakness: CWE-909

Description

Missing initialization of a variable in the TPM2 source may allow a privileged user to potentially enable an escalation of privilege via local access. This affects tpm2-tss before 3.0.1 and before 2.4.3.

Affected products

Fedoraproject Fedora: 34
tpm2-software tpm2-tss: before 2.4.3; from 3.0.0 before 3.0.1 — fixed in 2.4.3, 3.0.1

How to fix

Upgrade to a fixed version: tpm2-software tpm2-tss 2.4.3, 3.0.1. Check the vendor advisory for mitigations.

References

https://bugzilla.redhat.com/show_bug.cgi?id=1902167
https://github.com/tpm2-software/tpm2-tss/releases/tag/2.4.3
https://github.com/tpm2-software/tpm2-tss/releases/tag/3.0.1
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7KPOENCMJU4DMT3BDNUBRK25B3DJ47UO/
https://security.gentoo.org/glsa/202107-10
https://bugzilla.redhat.com/show_bug.cgi?id=1902167
https://github.com/tpm2-software/tpm2-tss/releases/tag/2.4.3
https://github.com/tpm2-software/tpm2-tss/releases/tag/3.0.1
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7KPOENCMJU4DMT3BDNUBRK25B3DJ47UO/
https://security.gentoo.org/glsa/202107-10

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