Linux Kernel up to 5.10.32/5.11.16 on TIS TPM tpm_try_get_ops privilege escalation

Summaryinfo

A vulnerability, which was classified as problematic, was found in Linux Kernel up to 5.10.32/5.11.16 on TIS. Impacted is the function tpm_try_get_ops of the component TPM. The manipulation results in an unknown weakness. This vulnerability is identified as CVE-2021-46922. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.10.32/5.11.16 on TIS (Operating System). It has been classified as problematic. Affected is the function tpm_try_get_ops of the component TPM. The impact remains unknown. CVE summarizes:

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()

The weakness was released 02/27/2024. The advisory is available at git.kernel.org. This vulnerability is traded as CVE-2021-46922 since 02/25/2024. Technical details are known, but there is no available exploit.

Upgrading to version 5.10.33 or 5.11.17 eliminates this vulnerability. Applying the patch bf84ef2dd2cc/39c8d760d44c is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.10.0
• 5.10.1
• 5.10.2
• 5.10.3
• 5.10.4
• 5.10.5
• 5.10.6
• 5.10.7
• 5.10.8
• 5.10.9
• 5.10.10
• 5.10.11
• 5.10.12
• 5.10.13
• 5.10.14
• 5.10.15
• 5.10.16
• 5.10.17
• 5.10.18
• 5.10.19
• 5.10.20
• 5.10.21
• 5.10.22
• 5.10.23
• 5.10.24
• 5.10.25
• 5.10.26
• 5.10.27
• 5.10.28
• 5.10.29
• 5.10.30
• 5.10.31
• 5.10.32
• 5.11.0
• 5.11.1
• 5.11.2
• 5.11.3
• 5.11.4
• 5.11.5
• 5.11.6
• 5.11.7
• 5.11.8
• 5.11.9
• 5.11.10
• 5.11.11
• 5.11.12
• 5.11.13
• 5.11.14
• 5.11.15
• 5.11.16

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

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