fkie_cve-2022-49286
Vulnerability from fkie_nvd
Published
2025-02-26 07:01
Modified
2025-09-22 19:35
Severity ?
Summary
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.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | 5.17 |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntpm: use try_get_ops() in tpm-space.c\n\nAs part of the series conversion to remove nested TPM operations:\n\nhttps://lore.kernel.org/all/20190205224723.19671-1-jarkko.sakkinen@linux.intel.com/\n\nexposure of the chip-\u003etpm_mutex was removed from much of the upper\nlevel code. In this conversion, tpm2_del_space() was missed. This\ndidn\u0027t matter much because it\u0027s usually called closely after a\nconverted operation, so there\u0027s only a very tiny race window where the\nchip can be removed before the space flushing is done which causes a\nNULL deref on the mutex. However, there are reports of this window\nbeing hit in practice, so fix this by converting tpm2_del_space() to\nuse tpm_try_get_ops(), which performs all the teardown checks before\nacquring the mutex."
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tpm: uso try_get_ops() en tpm-space.c Como parte de la conversi\u00f3n en serie para eliminar las operaciones TPM anidadas: https://lore.kernel.org/all/20190205224723.19671-1-jarkko.sakkinen@linux.intel.com/ se elimin\u00f3 la exposici\u00f3n del chip-\u0026gt;tpm_mutex de gran parte del c\u00f3digo de nivel superior. En esta conversi\u00f3n, se pas\u00f3 por alto tpm2_del_space(). Esto no import\u00f3 mucho porque generalmente se llama poco despu\u00e9s de una operaci\u00f3n convertida, por lo que solo hay una ventana de ejecuci\u00f3n muy peque\u00f1a donde se puede quitar el chip antes de que se realice el vaciado de espacio, lo que provoca una desreferencia NULL en el mutex. Sin embargo, hay informes de que esta ventana se alcanza en la pr\u00e1ctica, as\u00ed que solucione esto convirtiendo tpm2_del_space() para usar tpm_try_get_ops(), que realiza todas las comprobaciones de desmontaje antes de adquirir el mutex."
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"id": "CVE-2022-49286",
"lastModified": "2025-09-22T19:35:01.907",
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
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- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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