ghsa-cfrr-p6rw-prf5
Vulnerability from github
Published
2024-08-21 09:31
Modified
2024-09-06 15:32
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Details

In the Linux kernel, the following vulnerability has been resolved:

dmaengine: idxd: Prevent use after free on completion memory

On driver unload any pending descriptors are flushed at the time the interrupt is freed: idxd_dmaengine_drv_remove() -> drv_disable_wq() -> idxd_wq_free_irq() -> idxd_flush_pending_descs().

If there are any descriptors present that need to be flushed this flow triggers a "not present" page fault as below:

BUG: unable to handle page fault for address: ff391c97c70c9040 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page

The address that triggers the fault is the address of the descriptor that was freed moments earlier via: drv_disable_wq()->idxd_wq_free_resources()

Fix the use after free by freeing the descriptors after any possible usage. This is done after idxd_wq_reset() to ensure that the memory remains accessible during possible completion writes by the device.

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{
  "affected": [],
  "aliases": [
    "CVE-2022-48867"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-08-21T07:15:03Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: idxd: Prevent use after free on completion memory\n\nOn driver unload any pending descriptors are flushed at the\ntime the interrupt is freed:\nidxd_dmaengine_drv_remove() -\u003e\n\tdrv_disable_wq() -\u003e\n\t\tidxd_wq_free_irq() -\u003e\n\t\t\tidxd_flush_pending_descs().\n\nIf there are any descriptors present that need to be flushed this\nflow triggers a \"not present\" page fault as below:\n\n BUG: unable to handle page fault for address: ff391c97c70c9040\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n\nThe address that triggers the fault is the address of the\ndescriptor that was freed moments earlier via:\ndrv_disable_wq()-\u003eidxd_wq_free_resources()\n\nFix the use after free by freeing the descriptors after any possible\nusage. This is done after idxd_wq_reset() to ensure that the memory\nremains accessible during possible completion writes by the device.",
  "id": "GHSA-cfrr-p6rw-prf5",
  "modified": "2024-09-06T15:32:56Z",
  "published": "2024-08-21T09:31:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-48867"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1beeec45f9ac31eba52478379f70a5fa9c2ad005"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b9e8e3fcfec625fc1c2f68f684448aeeb882625b"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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