ghsa-j8q3-52jg-4q93
Vulnerability from github
Published
2025-09-22 21:30
Modified
2025-09-22 21:30
Severity ?
4.7 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2022-49286"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-02-26T07:01:05Z",
    "severity": "MODERATE"
  },
  "details": "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.",
  "id": "GHSA-j8q3-52jg-4q93",
  "modified": "2025-09-22T21:30:16Z",
  "published": "2025-09-22T21:30:16Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49286"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/476ddd23f818fb94cf86fb5617f3bb9a7c92113d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5b1d2561a03e534064b51c50c774657833d3d2cf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/95193d12f10a8a088843b25e0f5fe1d83ec6b079"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ba84f9a48366dcc3cdef978599433efe101dd5bd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eda1662cce964c8a65bb86321f8d9cfa6e9ceaab"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fb5abce6b2bb5cb3d628aaa63fa821da8c4600f9"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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