CVE-2021-46922: linux kernel — Fix

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/[email protected]/ 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()

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Products

Vendor	Product	Versions
linux	linux_kernel	5.10.20 — 5.10.33
linux	linux_kernel	5.11.3 — 5.11.17

References

Advisories & Patches

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

Frequently Asked Questions

What is CVE-2021-46922? +

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/[email protected]/ 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() It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-46922? +

CVE-2021-46922 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2021-46922? +

CVE-2021-46922 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2021-46922? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2021-46922