github - ghsa-gf6p-hmwh-gpc7

GHSA-GF6P-HMWH-GPC7

Vulnerability from github – Published: 2024-04-10 21:30 – Updated: 2025-01-07 18:30

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."

Severity ?

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2021-47200"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-04-10T19:15:48Z",
    "severity": "HIGH"
  },
  "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": "2025-01-07T18:30:41Z",
  "published": "2024-04-10T21:30:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47200"
    },
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      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4f8e469a2384dfa4047145b0093126462cbb6dc0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8244a3bc27b3efd057da154b8d7e414670d5044f"
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  "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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}

CVE-2021-47200 (GCVE-0-2021-47200)

Vulnerability from cvelistv5 – Published: 2024-04-10 18:56 – Updated: 2025-05-04 07:06

Summary

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."

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/4f8e469a2384dfa40…
	https://git.kernel.org/stable/c/8244a3bc27b3efd05…

Impacted products

Vendor

Product

Version

Linux

Affected: 9786b65bc61acec63f923978c75e707afbb74bc7 , < 4f8e469a2384dfa4047145b0093126462cbb6dc0 (git)
Affected: 9786b65bc61acec63f923978c75e707afbb74bc7 , < 8244a3bc27b3efd057da154b8d7e414670d5044f (git)

Linux

Affected: 5.5
Unaffected: 0 , < 5.5 (semver)
Unaffected: 5.15.5 , ≤ 5.15.* (semver)
Unaffected: 5.16 , ≤ * (original_commit_for_fix)

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-GF6P-HMWH-GPC7

CVE-2021-47200 (GCVE-0-2021-47200)

Tags

Sightings

Nomenclature