Vulnerability-Lookup

CVE-2026-98344 (GCVE-0-2026-98344)

Vulnerability from cvelistv5 – Published: 2026-10-06 08:46 – Updated: 2026-10-06 08:46

Title

dmaengine: Fix device kref underflow in dma_chan_put()

Summary

In the Linux kernel, the following vulnerability has been resolved: dmaengine: Fix device kref underflow in dma_chan_put() dma_chan_get() takes chan->device->ref only on the slow path: /* no kref on fast path */ if (chan->client_count) { __module_get(owner); chan->client_count++; return 0; } if (!try_module_get(owner)) return -ENODEV; if (!dma_device_get(chan->device)) { // calls kref_get_unless_zero() dma_chan_put() drops the ref unconditionally, so every fast-path get/put pair drops one extra device reference. The bug fires when two conditions hold together: a non-private provider has a persistent client holding chan->client_count > 0 and another client cycles dmaengine_get()/dmaengine_put(). When the kref hits zero, the subsequent dma_find_channel() returns NULL even though the provider module is still loaded. Fix this by dropping device->ref only on the last put, matching the single slow-path get.

Severity

No CVSS data available.

Assigner

Linux mitre root Scorecard

References

8 references

URL	Tags
https://git.kernel.org/stable/c/036b527f92570206d…
https://git.kernel.org/stable/c/5fb1797a8c9485e40…
https://git.kernel.org/stable/c/57f7f1c6827be7d8f…
https://git.kernel.org/stable/c/7c3f4ce651d43705f…
https://git.kernel.org/stable/c/de2677e57d3161390…
https://git.kernel.org/stable/c/1a0d9b406febf2305…
https://git.kernel.org/stable/c/77906ac448d2fa81f…
https://git.kernel.org/stable/c/44dab659064eb5c10…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: 8ad342a863590b24ce77681b7e081363fb3333f7 , < 036b527f92570206da4b8c40b38f8d689e29d0f3 (git) Affected: 8ad342a863590b24ce77681b7e081363fb3333f7 , < 5fb1797a8c9485e40e5492fa0338ab5c7d1f3fef (git) Affected: 8ad342a863590b24ce77681b7e081363fb3333f7 , < 57f7f1c6827be7d8f80feca48d2125fb91c6f6ed (git) Affected: 8ad342a863590b24ce77681b7e081363fb3333f7 , < 7c3f4ce651d43705f9ec7f778f642a90d5ff4fba (git) Affected: 8ad342a863590b24ce77681b7e081363fb3333f7 , < de2677e57d3161390d8a508f08cddec6ef7e4b23 (git) Affected: 8ad342a863590b24ce77681b7e081363fb3333f7 , < 1a0d9b406febf23054ad595fd47b29325e70fb2d (git) Affected: 8ad342a863590b24ce77681b7e081363fb3333f7 , < 77906ac448d2fa81fa710ae26c0e591ebdc81154 (git) Affected: 8ad342a863590b24ce77681b7e081363fb3333f7 , < 44dab659064eb5c10adb0306510eebe848ed592d (git)	guessed
Linux	Linux	Affected: 5.6 Unaffected: 0 , < 5.6 (semver) Unaffected: 5.10.271 , ≤ 5.10.* (semver) Unaffected: 5.15.222 , ≤ 5.15.* (semver) Unaffected: 6.1.189 , ≤ 6.1.* (semver) Unaffected: 6.6.158 , ≤ 6.6.* (semver) Unaffected: 6.12.112 , ≤ 6.12.* (semver) Unaffected: 6.18.54 , ≤ 6.18.* (semver) Unaffected: 7.2.8 , ≤ 7.2.* (semver) Unaffected: 7.3-rc4 , ≤ * (original_commit_for_fix)	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/dma/dmaengine.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "036b527f92570206da4b8c40b38f8d689e29d0f3",
              "status": "affected",
              "version": "8ad342a863590b24ce77681b7e081363fb3333f7",
              "versionType": "git"
            },
            {
              "lessThan": "5fb1797a8c9485e40e5492fa0338ab5c7d1f3fef",
              "status": "affected",
              "version": "8ad342a863590b24ce77681b7e081363fb3333f7",
              "versionType": "git"
            },
            {
              "lessThan": "57f7f1c6827be7d8f80feca48d2125fb91c6f6ed",
              "status": "affected",
              "version": "8ad342a863590b24ce77681b7e081363fb3333f7",
              "versionType": "git"
            },
            {
              "lessThan": "7c3f4ce651d43705f9ec7f778f642a90d5ff4fba",
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              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "1a0d9b406febf23054ad595fd47b29325e70fb2d",
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              "versionType": "git"
            },
            {
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              "versionType": "git"
            },
            {
              "lessThan": "44dab659064eb5c10adb0306510eebe848ed592d",
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/dma/dmaengine.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.6"
            },
            {
              "lessThan": "5.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.271",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.54",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc4",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.271",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.222",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.189",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.158",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.112",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.54",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.8",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc4",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: Fix device kref underflow in dma_chan_put()\n\ndma_chan_get() takes chan-\u003edevice-\u003eref only on the slow path:\n\n\t/* no kref on fast path */\n\tif (chan-\u003eclient_count) {\n\t\t__module_get(owner);\n\t\tchan-\u003eclient_count++;\n\t\treturn 0;\n\t}\n\tif (!try_module_get(owner))\n\t\treturn -ENODEV;\n\tif (!dma_device_get(chan-\u003edevice)) { // calls kref_get_unless_zero()\n\ndma_chan_put() drops the ref unconditionally, so every fast-path\nget/put pair drops one extra device reference.\n\nThe bug fires when two conditions hold together: a non-private\nprovider has a persistent client holding chan-\u003eclient_count \u003e 0\nand another client cycles dmaengine_get()/dmaengine_put().\nWhen the kref hits zero, the subsequent dma_find_channel() returns\nNULL even though the provider module is still loaded.\n\nFix this by dropping device-\u003eref only on the last put, matching the\nsingle slow-path get."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-06T08:46:33.997Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/036b527f92570206da4b8c40b38f8d689e29d0f3"
        },
        {
          "url": "https://git.kernel.org/stable/c/5fb1797a8c9485e40e5492fa0338ab5c7d1f3fef"
        },
        {
          "url": "https://git.kernel.org/stable/c/57f7f1c6827be7d8f80feca48d2125fb91c6f6ed"
        },
        {
          "url": "https://git.kernel.org/stable/c/7c3f4ce651d43705f9ec7f778f642a90d5ff4fba"
        },
        {
          "url": "https://git.kernel.org/stable/c/de2677e57d3161390d8a508f08cddec6ef7e4b23"
        },
        {
          "url": "https://git.kernel.org/stable/c/1a0d9b406febf23054ad595fd47b29325e70fb2d"
        },
        {
          "url": "https://git.kernel.org/stable/c/77906ac448d2fa81fa710ae26c0e591ebdc81154"
        },
        {
          "url": "https://git.kernel.org/stable/c/44dab659064eb5c10adb0306510eebe848ed592d"
        }
      ],
      "title": "dmaengine: Fix device kref underflow in dma_chan_put()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98344",
    "datePublished": "2026-10-06T08:46:33.997Z",
    "dateReserved": "2026-09-25T10:25:14.343Z",
    "dateUpdated": "2026-10-06T08:46:33.997Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-98344",
      "date": "2026-10-06",
      "epss": "0.00184",
      "percentile": "0.07299"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "drivers/dma/dmaengine.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
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                    "versionType": "git"
                  },
                  {
                    "lessThan": "5fb1797a8c9485e40e5492fa0338ab5c7d1f3fef",
                    "status": "affected",
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                    "versionType": "git"
                  },
                  {
                    "lessThan": "57f7f1c6827be7d8f80feca48d2125fb91c6f6ed",
                    "status": "affected",
                    "version": "8ad342a863590b24ce77681b7e081363fb3333f7",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "7c3f4ce651d43705f9ec7f778f642a90d5ff4fba",
                    "status": "affected",
                    "version": "8ad342a863590b24ce77681b7e081363fb3333f7",
                    "versionType": "git"
                  },
                  {
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                    "versionType": "git"
                  },
                  {
                    "lessThan": "1a0d9b406febf23054ad595fd47b29325e70fb2d",
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                    "version": "8ad342a863590b24ce77681b7e081363fb3333f7",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "77906ac448d2fa81fa710ae26c0e591ebdc81154",
                    "status": "affected",
                    "version": "8ad342a863590b24ce77681b7e081363fb3333f7",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "44dab659064eb5c10adb0306510eebe848ed592d",
                    "status": "affected",
                    "version": "8ad342a863590b24ce77681b7e081363fb3333f7",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "drivers/dma/dmaengine.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "5.6"
                  },
                  {
                    "lessThan": "5.6",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.10.*",
                    "status": "unaffected",
                    "version": "5.10.271",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.15.*",
                    "status": "unaffected",
                    "version": "5.15.222",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.1.*",
                    "status": "unaffected",
                    "version": "6.1.189",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.6.*",
                    "status": "unaffected",
                    "version": "6.6.158",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.112",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.18.*",
                    "status": "unaffected",
                    "version": "6.18.54",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "7.2.*",
                    "status": "unaffected",
                    "version": "7.2.8",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.3-rc4",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: Fix device kref underflow in dma_chan_put()\n\ndma_chan_get() takes chan-\u003edevice-\u003eref only on the slow path:\n\n\t/* no kref on fast path */\n\tif (chan-\u003eclient_count) {\n\t\t__module_get(owner);\n\t\tchan-\u003eclient_count++;\n\t\treturn 0;\n\t}\n\tif (!try_module_get(owner))\n\t\treturn -ENODEV;\n\tif (!dma_device_get(chan-\u003edevice)) { // calls kref_get_unless_zero()\n\ndma_chan_put() drops the ref unconditionally, so every fast-path\nget/put pair drops one extra device reference.\n\nThe bug fires when two conditions hold together: a non-private\nprovider has a persistent client holding chan-\u003eclient_count \u003e 0\nand another client cycles dmaengine_get()/dmaengine_put().\nWhen the kref hits zero, the subsequent dma_find_channel() returns\nNULL even though the provider module is still loaded.\n\nFix this by dropping device-\u003eref only on the last put, matching the\nsingle slow-path get."
          }
        ],
        "id": "CVE-2026-98344",
        "lastModified": "2026-10-06T09:18:27.323",
        "metrics": {},
        "published": "2026-10-06T09:18:27.323",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/036b527f92570206da4b8c40b38f8d689e29d0f3"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/1a0d9b406febf23054ad595fd47b29325e70fb2d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/44dab659064eb5c10adb0306510eebe848ed592d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/57f7f1c6827be7d8f80feca48d2125fb91c6f6ed"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/5fb1797a8c9485e40e5492fa0338ab5c7d1f3fef"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/77906ac448d2fa81fa710ae26c0e591ebdc81154"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7c3f4ce651d43705f9ec7f778f642a90d5ff4fba"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/de2677e57d3161390d8a508f08cddec6ef7e4b23"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}

FKIE_CVE-2026-98344

Vulnerability from fkie_nvd - Published: 2026-10-06 09:18 - Updated: 2026-10-06 09:18

Severity

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/036b527f92570206da4b8c40b38f8d689e29d0f3
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1a0d9b406febf23054ad595fd47b29325e70fb2d
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/44dab659064eb5c10adb0306510eebe848ed592d
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/57f7f1c6827be7d8f80feca48d2125fb91c6f6ed
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5fb1797a8c9485e40e5492fa0338ab5c7d1f3fef
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/77906ac448d2fa81fa710ae26c0e591ebdc81154
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/7c3f4ce651d43705f9ec7f778f642a90d5ff4fba
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/de2677e57d3161390d8a508f08cddec6ef7e4b23

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/dma/dmaengine.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "036b527f92570206da4b8c40b38f8d689e29d0f3",
              "status": "affected",
              "version": "8ad342a863590b24ce77681b7e081363fb3333f7",
              "versionType": "git"
            },
            {
              "lessThan": "5fb1797a8c9485e40e5492fa0338ab5c7d1f3fef",
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              "version": "8ad342a863590b24ce77681b7e081363fb3333f7",
              "versionType": "git"
            },
            {
              "lessThan": "57f7f1c6827be7d8f80feca48d2125fb91c6f6ed",
              "status": "affected",
              "version": "8ad342a863590b24ce77681b7e081363fb3333f7",
              "versionType": "git"
            },
            {
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              "version": "8ad342a863590b24ce77681b7e081363fb3333f7",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "8ad342a863590b24ce77681b7e081363fb3333f7",
              "versionType": "git"
            },
            {
              "lessThan": "1a0d9b406febf23054ad595fd47b29325e70fb2d",
              "status": "affected",
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              "versionType": "git"
            },
            {
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            },
            {
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              "status": "affected",
              "version": "8ad342a863590b24ce77681b7e081363fb3333f7",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/dma/dmaengine.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.6"
            },
            {
              "lessThan": "5.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.271",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.54",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc4",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: Fix device kref underflow in dma_chan_put()\n\ndma_chan_get() takes chan-\u003edevice-\u003eref only on the slow path:\n\n\t/* no kref on fast path */\n\tif (chan-\u003eclient_count) {\n\t\t__module_get(owner);\n\t\tchan-\u003eclient_count++;\n\t\treturn 0;\n\t}\n\tif (!try_module_get(owner))\n\t\treturn -ENODEV;\n\tif (!dma_device_get(chan-\u003edevice)) { // calls kref_get_unless_zero()\n\ndma_chan_put() drops the ref unconditionally, so every fast-path\nget/put pair drops one extra device reference.\n\nThe bug fires when two conditions hold together: a non-private\nprovider has a persistent client holding chan-\u003eclient_count \u003e 0\nand another client cycles dmaengine_get()/dmaengine_put().\nWhen the kref hits zero, the subsequent dma_find_channel() returns\nNULL even though the provider module is still loaded.\n\nFix this by dropping device-\u003eref only on the last put, matching the\nsingle slow-path get."
    }
  ],
  "id": "CVE-2026-98344",
  "lastModified": "2026-10-06T09:18:27.323",
  "metrics": {},
  "published": "2026-10-06T09:18:27.323",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/036b527f92570206da4b8c40b38f8d689e29d0f3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1a0d9b406febf23054ad595fd47b29325e70fb2d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/44dab659064eb5c10adb0306510eebe848ed592d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/57f7f1c6827be7d8f80feca48d2125fb91c6f6ed"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5fb1797a8c9485e40e5492fa0338ab5c7d1f3fef"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/77906ac448d2fa81fa710ae26c0e591ebdc81154"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7c3f4ce651d43705f9ec7f778f642a90d5ff4fba"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/de2677e57d3161390d8a508f08cddec6ef7e4b23"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

GHSA-G4C2-FM3R-X4GH

Vulnerability from github – Published: 2026-10-06 09:31 – Updated: 2026-10-06 09:31

Details

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

dmaengine: Fix device kref underflow in dma_chan_put()

dma_chan_get() takes chan->device->ref only on the slow path:

/* no kref on fast path */
if (chan->client_count) {
    __module_get(owner);
    chan->client_count++;
    return 0;
}
if (!try_module_get(owner))
    return -ENODEV;
if (!dma_device_get(chan->device)) { // calls kref_get_unless_zero()

dma_chan_put() drops the ref unconditionally, so every fast-path get/put pair drops one extra device reference.

The bug fires when two conditions hold together: a non-private provider has a persistent client holding chan->client_count > 0 and another client cycles dmaengine_get()/dmaengine_put(). When the kref hits zero, the subsequent dma_find_channel() returns NULL even though the provider module is still loaded.

Fix this by dropping device->ref only on the last put, matching the single slow-path get.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-98344"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-06T09:18:27Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: Fix device kref underflow in dma_chan_put()\n\ndma_chan_get() takes chan-\u003edevice-\u003eref only on the slow path:\n\n\t/* no kref on fast path */\n\tif (chan-\u003eclient_count) {\n\t\t__module_get(owner);\n\t\tchan-\u003eclient_count++;\n\t\treturn 0;\n\t}\n\tif (!try_module_get(owner))\n\t\treturn -ENODEV;\n\tif (!dma_device_get(chan-\u003edevice)) { // calls kref_get_unless_zero()\n\ndma_chan_put() drops the ref unconditionally, so every fast-path\nget/put pair drops one extra device reference.\n\nThe bug fires when two conditions hold together: a non-private\nprovider has a persistent client holding chan-\u003eclient_count \u003e 0\nand another client cycles dmaengine_get()/dmaengine_put().\nWhen the kref hits zero, the subsequent dma_find_channel() returns\nNULL even though the provider module is still loaded.\n\nFix this by dropping device-\u003eref only on the last put, matching the\nsingle slow-path get.",
  "id": "GHSA-g4c2-fm3r-x4gh",
  "modified": "2026-10-06T09:31:36Z",
  "published": "2026-10-06T09:31:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98344"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/036b527f92570206da4b8c40b38f8d689e29d0f3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1a0d9b406febf23054ad595fd47b29325e70fb2d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/44dab659064eb5c10adb0306510eebe848ed592d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/57f7f1c6827be7d8f80feca48d2125fb91c6f6ed"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5fb1797a8c9485e40e5492fa0338ab5c7d1f3fef"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/77906ac448d2fa81fa710ae26c0e591ebdc81154"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7c3f4ce651d43705f9ec7f778f642a90d5ff4fba"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/de2677e57d3161390d8a508f08cddec6ef7e4b23"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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Action not permitted

CVE-2026-98344 (GCVE-0-2026-98344)

FKIE_CVE-2026-98344

GHSA-G4C2-FM3R-X4GH

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