github - ghsa-f95q-fwq6-mx8w

GHSA-F95Q-FWQ6-MX8W

Vulnerability from github – Published: 2024-08-21 00:30 – Updated: 2025-11-04 00:31

Details

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

drm/vmwgfx: Fix a deadlock in dma buf fence polling

Introduce a version of the fence ops that on release doesn't remove the fence from the pending list, and thus doesn't require a lock to fix poll->fence wait->fence unref deadlocks.

vmwgfx overwrites the wait callback to iterate over the list of all fences and update their status, to do that it holds a lock to prevent the list modifcations from other threads. The fence destroy callback both deletes the fence and removes it from the list of pending fences, for which it holds a lock.

dma buf polling cb unrefs a fence after it's been signaled: so the poll calls the wait, which signals the fences, which are being destroyed. The destruction tries to acquire the lock on the pending fences list which it can never get because it's held by the wait from which it was called.

Old bug, but not a lot of userspace apps were using dma-buf polling interfaces. Fix those, in particular this fixes KDE stalls/deadlock.

Severity ?

5.5 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2024-43863"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-667"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-08-21T00:15:04Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vmwgfx: Fix a deadlock in dma buf fence polling\n\nIntroduce a version of the fence ops that on release doesn\u0027t remove\nthe fence from the pending list, and thus doesn\u0027t require a lock to\nfix poll-\u003efence wait-\u003efence unref deadlocks.\n\nvmwgfx overwrites the wait callback to iterate over the list of all\nfences and update their status, to do that it holds a lock to prevent\nthe list modifcations from other threads. The fence destroy callback\nboth deletes the fence and removes it from the list of pending\nfences, for which it holds a lock.\n\ndma buf polling cb unrefs a fence after it\u0027s been signaled: so the poll\ncalls the wait, which signals the fences, which are being destroyed.\nThe destruction tries to acquire the lock on the pending fences list\nwhich it can never get because it\u0027s held by the wait from which it\nwas called.\n\nOld bug, but not a lot of userspace apps were using dma-buf polling\ninterfaces. Fix those, in particular this fixes KDE stalls/deadlock.",
  "id": "GHSA-f95q-fwq6-mx8w",
  "modified": "2025-11-04T00:31:17Z",
  "published": "2024-08-21T00:30:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-43863"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3b933b16c996af8adb6bc1b5748a63dfb41a82bc"
    },
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      "url": "https://git.kernel.org/stable/c/9908dc0d2ef0e4aec8a242c098455729c0e2f017"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9e20d028d8d1deb1e7fed18f22ffc01669cf3237"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a8943969f9ead2fd3044fc826140a21622ef830e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c98ab18b9f315ff977c2c65d7c71298ef98be8e3"
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      "url": "https://git.kernel.org/stable/c/e58337100721f3cc0c7424a18730e4f39844934f"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
    },
    {
      "type": "WEB",
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  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2024-43863 (GCVE-0-2024-43863)

Vulnerability from cvelistv5 – Published: 2024-08-20 23:45 – Updated: 2025-11-03 22:06

Summary

In the Linux kernel, the following vulnerability has been resolved: drm/vmwgfx: Fix a deadlock in dma buf fence polling Introduce a version of the fence ops that on release doesn't remove the fence from the pending list, and thus doesn't require a lock to fix poll->fence wait->fence unref deadlocks. vmwgfx overwrites the wait callback to iterate over the list of all fences and update their status, to do that it holds a lock to prevent the list modifcations from other threads. The fence destroy callback both deletes the fence and removes it from the list of pending fences, for which it holds a lock. dma buf polling cb unrefs a fence after it's been signaled: so the poll calls the wait, which signals the fences, which are being destroyed. The destruction tries to acquire the lock on the pending fences list which it can never get because it's held by the wait from which it was called. Old bug, but not a lot of userspace apps were using dma-buf polling interfaces. Fix those, in particular this fixes KDE stalls/deadlock.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/9908dc0d2ef0e4aec…
	https://git.kernel.org/stable/c/9e20d028d8d1deb1e…
	https://git.kernel.org/stable/c/3b933b16c996af8ad…
	https://git.kernel.org/stable/c/a8943969f9ead2fd3…
	https://git.kernel.org/stable/c/c98ab18b9f315ff97…
	https://git.kernel.org/stable/c/e58337100721f3cc0…

Impacted products

Vendor

Product

Version

Linux

Affected: 2298e804e96eb3635c39519c8287befd92460303 , < 9908dc0d2ef0e4aec8a242c098455729c0e2f017 (git)
Affected: 2298e804e96eb3635c39519c8287befd92460303 , < 9e20d028d8d1deb1e7fed18f22ffc01669cf3237 (git)
Affected: 2298e804e96eb3635c39519c8287befd92460303 , < 3b933b16c996af8adb6bc1b5748a63dfb41a82bc (git)
Affected: 2298e804e96eb3635c39519c8287befd92460303 , < a8943969f9ead2fd3044fc826140a21622ef830e (git)
Affected: 2298e804e96eb3635c39519c8287befd92460303 , < c98ab18b9f315ff977c2c65d7c71298ef98be8e3 (git)
Affected: 2298e804e96eb3635c39519c8287befd92460303 , < e58337100721f3cc0c7424a18730e4f39844934f (git)

Linux

Affected: 3.18
Unaffected: 0 , < 3.18 (semver)
Unaffected: 5.10.238 , ≤ 5.10.* (semver)
Unaffected: 5.15.165 , ≤ 5.15.* (semver)
Unaffected: 6.1.104 , ≤ 6.1.* (semver)
Unaffected: 6.6.45 , ≤ 6.6.* (semver)
Unaffected: 6.10.4 , ≤ 6.10.* (semver)
Unaffected: 6.11 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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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-F95Q-FWQ6-MX8W

CVE-2024-43863 (GCVE-0-2024-43863)

Tags

Sightings

Nomenclature