CVE-2021-46922 (GCVE-0-2021-46922)

Vulnerability from cvelistv5 – Published: 2024-02-27 09:36 – Updated: 2026-08-05 08:45
VLAI
Title
KEYS: trusted: Fix TPM reservation for seal/unseal
Summary
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()
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-07-25 16:00 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 67118bb78d72aab5b831f054a74ae856339a1974 , < bf84ef2dd2ccdcd8f2658476d34b51455f970ce4 (git)
Affected: 498b8fc1cdc13b57b02dd28544b18323900fae10 , < 39c8d760d44cb3fa0d67e8cd505df81cf4d80999 (git)
Affected: 8c657a0590de585b1115847c17b34a58025f2f4b , < 9d5171eab462a63e2fbebfccf6026e92be018f20 (git)
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Linux Linux Affected: 5.10.20 , < 5.10.33 (semver)
Affected: 5.11.3 , < 5.11.17 (semver)
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Show details on NVD website
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      "product_status:known_affected": "42",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: KEYS: trusted: Fix TPM reservation for seal/unseal",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-46922.json",
      "version": "3"
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      "current_release_date": "2026-08-26T02:25:12Z",
      "cve": "CVE-2021-46922",
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      "product_status:known_affected": "388",
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      "product_status:recommended": "91",
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      "status": "interim",
      "title": "SUSE CVE CVE-2021-46922",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-46922.json",
      "version": "43"
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              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKEYS: trusted: Fix TPM reservation for seal/unseal\n\nThe original patch 8c657a0590de (\"KEYS: trusted: Reserve TPM for seal\nand unseal operations\") was correct on the mailing list:\n\nhttps://lore.kernel.org/linux-integrity/20210128235621.127925-4-jarkko@kernel.org/\n\nBut somehow got rebased so that the tpm_try_get_ops() in\ntpm2_seal_trusted() got lost.  This causes an imbalanced put of the\nTPM ops and causes oopses on TIS based hardware.\n\nThis fix puts back the lost tpm_try_get_ops()"
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                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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                  "value": "AV:L - The bug is reached via the local add_key/keyctl syscall path (trusted_instantiate \u2192 trusted_tpm_seal \u2192 tpm2_seal_trusted), not via network packets or physical device I/O.\nAC:L - An attacker can reliably trigger the imbalanced tpm_put_ops by creating a TPM2 trusted key (e.g. keyctl add trusted ... \"new 32\"); no race or attacker-uncontrollable condition is required, and put runs even when the TPM command fails.\nPR:L - Creating a trusted key requires only an unprivileged local account with write access to a keyring the caller possesses (documented as keyctl add trusted ... @u); there is no capability check in the trusted-key instantiate path.\nUI:N - The attacker invokes add_key/keyctl directly; no separate victim action is required.\nS:U - Impact is confined to the host kernel privilege domain (lock/refcount corruption and potential tpm_chip UAF); it does not cross a VM, IOMMU, or other security authority boundary.\nC:H - tpm_put_ops without a matching tpm_try_get_ops drops a real device reference via put_device and can free the still-referenced tpm_chip, yielding a heap use-after-free that can be leveraged for arbitrary memory disclosure.\nI:H - The same premature free of tpm_chip (which contains ops function pointers), plus unlocking an unheld tpm_mutex and up_read of ops_sem, enables heap reuse and control-flow hijacking primitives under UAF guidance.\nA:H - The fix commit documents kernel oopses on TIS hardware from the imbalanced put, and the resulting UAF/lock corruption can crash or destabilize the kernel."
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        "dateReserved": "2024-02-25T13:45:52.719Z",
        "dateUpdated": "2026-08-05T08:45:06.331Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
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    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.