github - ghsa-gf6p-hmwh-gpc7

ghsa-gf6p-hmwh-gpc7

Vulnerability from github

Published

2024-04-10 21:30

Modified

2024-04-10 21:30

Details

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

drm/prime: Fix use after free in mmap with drm_gem_ttm_mmap

drm_gem_ttm_mmap() drops a reference to the gem object on success. If the gem object's refcount == 1 on entry to drm_gem_prime_mmap(), that drop will free the gem object, and the subsequent drm_gem_object_get() will be a UAF. Fix by grabbing a reference before calling the mmap helper.

This issue was forseen when the reference dropping was adding in commit 9786b65bc61ac ("drm/ttm: fix mmap refcounting"): "For that to work properly the drm_gem_object_get() call in drm_gem_ttm_mmap() must be moved so it happens before calling obj->funcs->mmap(), otherwise the gem refcount would go down to zero."

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{
  "affected": [],
  "aliases": [
    "CVE-2021-47200"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-04-10T19:15:48Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/prime: Fix use after free in mmap with drm_gem_ttm_mmap\n\ndrm_gem_ttm_mmap() drops a reference to the gem object on success. If\nthe gem object\u0027s refcount == 1 on entry to drm_gem_prime_mmap(), that\ndrop will free the gem object, and the subsequent drm_gem_object_get()\nwill be a UAF. Fix by grabbing a reference before calling the mmap\nhelper.\n\nThis issue was forseen when the reference dropping was adding in\ncommit 9786b65bc61ac (\"drm/ttm: fix mmap refcounting\"):\n  \"For that to work properly the drm_gem_object_get() call in\n  drm_gem_ttm_mmap() must be moved so it happens before calling\n  obj-\u003efuncs-\u003emmap(), otherwise the gem refcount would go down\n  to zero.\"",
  "id": "GHSA-gf6p-hmwh-gpc7",
  "modified": "2024-04-10T21:30:31Z",
  "published": "2024-04-10T21:30:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47200"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4f8e469a2384dfa4047145b0093126462cbb6dc0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8244a3bc27b3efd057da154b8d7e414670d5044f"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

cve-2021-47200

Vulnerability from cvelistv5

Published

2024-04-10 18:56

Modified

2024-11-04 12:01

Severity ?

Summary

drm/prime: Fix use after free in mmap with drm_gem_ttm_mmap

References

▼	URL	Tags
	https://git.kernel.org/stable/c/4f8e469a2384dfa4047145b0093126462cbb6dc0
	https://git.kernel.org/stable/c/8244a3bc27b3efd057da154b8d7e414670d5044f

Impacted products

Vendor

Product

Version

▼

Linux

Version: 9786b65bc61a
Version: 9786b65bc61a

Linux

Version: 5.5

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  "containers": {
    "adp": [
      {
        "metrics": [
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            "other": {
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                "id": "CVE-2021-47200",
                "options": [
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                  },
                  {
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                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-04-15T14:57:54.210831Z",
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    "cna": {
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    "datePublished": "2024-04-10T18:56:35.152Z",
    "dateReserved": "2024-03-25T09:12:14.117Z",
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    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

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.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
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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