github - ghsa-rj36-vf3r-744c

GHSA-RJ36-VF3R-744C

Vulnerability from github – Published: 2025-06-18 12:30 – Updated: 2025-11-14 21:30

Details

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

dma-buf/dma-resv: check if the new fence is really later

Previously when we added a fence to a dma_resv object we always assumed the the newer than all the existing fences.

With Jason's work to add an UAPI to explicit export/import that's not necessary the case any more. So without this check we would allow userspace to force the kernel into an use after free error.

Since the change is very small and defensive it's probably a good idea to backport this to stable kernels as well just in case others are using the dma_resv object in the same way.

Severity ?

7.8 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2022-49935"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-06-18T11:15:20Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndma-buf/dma-resv: check if the new fence is really later\n\nPreviously when we added a fence to a dma_resv object we always\nassumed the the newer than all the existing fences.\n\nWith Jason\u0027s work to add an UAPI to explicit export/import that\u0027s not\nnecessary the case any more. So without this check we would allow\nuserspace to force the kernel into an use after free error.\n\nSince the change is very small and defensive it\u0027s probably a good\nidea to backport this to stable kernels as well just in case others\nare using the dma_resv object in the same way.",
  "id": "GHSA-rj36-vf3r-744c",
  "modified": "2025-11-14T21:30:27Z",
  "published": "2025-06-18T12:30:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49935"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a3f7c10a269d5b77dd5822ade822643ced3057f0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c4c798fe98adceb642050819cb57cbc8f5c27870"
    }
  ],
  "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"
    }
  ]
}

CVE-2022-49935 (GCVE-0-2022-49935)

Vulnerability from cvelistv5 – Published: 2025-06-18 10:54 – Updated: 2025-09-03 12:58

Title

dma-buf/dma-resv: check if the new fence is really later

Summary

In the Linux kernel, the following vulnerability has been resolved: dma-buf/dma-resv: check if the new fence is really later Previously when we added a fence to a dma_resv object we always assumed the the newer than all the existing fences. With Jason's work to add an UAPI to explicit export/import that's not necessary the case any more. So without this check we would allow userspace to force the kernel into an use after free error. Since the change is very small and defensive it's probably a good idea to backport this to stable kernels as well just in case others are using the dma_resv object in the same way.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/c4c798fe98adceb64…
	https://git.kernel.org/stable/c/a3f7c10a269d5b77d…

Impacted products

Vendor

Product

Version

Linux

Affected: 27836b641c1bf693c96c627388497b4e0f57441b , < c4c798fe98adceb642050819cb57cbc8f5c27870 (git)
Affected: 27836b641c1bf693c96c627388497b4e0f57441b , < a3f7c10a269d5b77dd5822ade822643ced3057f0 (git)

Linux

Affected: 5.0
Unaffected: 0 , < 5.0 (semver)
Unaffected: 5.19.8 , ≤ 5.19.* (semver)
Unaffected: 6.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/dma-buf/dma-resv.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c4c798fe98adceb642050819cb57cbc8f5c27870",
              "status": "affected",
              "version": "27836b641c1bf693c96c627388497b4e0f57441b",
              "versionType": "git"
            },
            {
              "lessThan": "a3f7c10a269d5b77dd5822ade822643ced3057f0",
              "status": "affected",
              "version": "27836b641c1bf693c96c627388497b4e0f57441b",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/dma-buf/dma-resv.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.0"
            },
            {
              "lessThan": "5.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.19.*",
              "status": "unaffected",
              "version": "5.19.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.19.8",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndma-buf/dma-resv: check if the new fence is really later\n\nPreviously when we added a fence to a dma_resv object we always\nassumed the the newer than all the existing fences.\n\nWith Jason\u0027s work to add an UAPI to explicit export/import that\u0027s not\nnecessary the case any more. So without this check we would allow\nuserspace to force the kernel into an use after free error.\n\nSince the change is very small and defensive it\u0027s probably a good\nidea to backport this to stable kernels as well just in case others\nare using the dma_resv object in the same way."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-03T12:58:58.435Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c4c798fe98adceb642050819cb57cbc8f5c27870"
        },
        {
          "url": "https://git.kernel.org/stable/c/a3f7c10a269d5b77dd5822ade822643ced3057f0"
        }
      ],
      "title": "dma-buf/dma-resv: check if the new fence is really later",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49935",
    "datePublished": "2025-06-18T10:54:36.963Z",
    "dateReserved": "2025-05-01T14:05:17.255Z",
    "dateUpdated": "2025-09-03T12:58:58.435Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

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-RJ36-VF3R-744C

CVE-2022-49935 (GCVE-0-2022-49935)

Tags

Sightings

Nomenclature