What’s Vulnerable › Vulnerabilities

CVE-2021-46922: KEYS: trusted: Fix TPM reservation for seal/unseal

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-02-27 · updated 2026-08-04

Description

In the Linux kernel, the following vulnerability has been resolved: KEYS: trusted: Fix TPM reservation for seal/unseal The original patch 8c657a0590de ("KEYS: trusted: Reserve TPM for seal and unseal operations") was correct on the mailing list: https://lore.kernel.org/linux-integrity/20210128235621.127925-4-jarkko@kernel.org/ But somehow got rebased so that the tpm_try_get_ops() in tpm2_seal_trusted() got lost. This causes an imbalanced put of the TPM ops and causes oopses on TIS based hardware. This fix puts back the lost tpm_try_get_ops()

Affected products

• Linux kernel: from 5.10.20 before 5.10.33; from 5.11.3 before 5.11.17 — fixed in 5.10.33, 5.11.17

How to fix

Upgrade to a fixed version: Linux kernel 5.10.33, 5.11.17. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/39c8d760d44cb3fa0d67e8cd505df81cf4d80999
• https://git.kernel.org/stable/c/9d5171eab462a63e2fbebfccf6026e92be018f20
• https://git.kernel.org/stable/c/bf84ef2dd2ccdcd8f2658476d34b51455f970ce4
• https://git.kernel.org/stable/c/39c8d760d44cb3fa0d67e8cd505df81cf4d80999
• https://git.kernel.org/stable/c/9d5171eab462a63e2fbebfccf6026e92be018f20
• https://git.kernel.org/stable/c/bf84ef2dd2ccdcd8f2658476d34b51455f970ce4

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