CVE-2022-49286: tpm: use try_get_ops() in tpm-space.c

Severity: medium (CVSS 4.7 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: 2025-02-26 · updated 2026-08-13
Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: tpm: use try_get_ops() in tpm-space.c As part of the series conversion to remove nested TPM operations: https://lore.kernel.org/all/20190205224723.19671-1-jarkko.sakkinen@linux.intel.com/ exposure of the chip->tpm_mutex was removed from much of the upper level code. In this conversion, tpm2_del_space() was missed. This didn't matter much because it's usually called closely after a converted operation, so there's only a very tiny race window where the chip can be removed before the space flushing is done which causes a NULL deref on the mutex. However, there are reports of this window being hit in practice, so fix this by converting tpm2_del_space() to use tpm_try_get_ops(), which performs all the teardown checks before acquring the mutex.

Affected products

Linux kernel: from 4.12 before 5.4.188; from 5.5 before 5.10.109; from 5.11 before 5.15.32; from 5.16 before 5.16.18; 5.17 — fixed in 5.10.109, 5.15.32, 5.16.18, 5.4.188

How to fix

Upgrade to a fixed version: Linux kernel 5.10.109, 5.15.32, 5.16.18, 5.4.188. Check the vendor advisory for mitigations.

References

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