{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "8ad342a863590b24ce77681b7e081363fb3333f7"
            },
            {
              "fixed": "036b527f92570206da4b8c40b38f8d689e29d0f3"
            },
            {
              "fixed": "5fb1797a8c9485e40e5492fa0338ab5c7d1f3fef"
            },
            {
              "fixed": "57f7f1c6827be7d8f80feca48d2125fb91c6f6ed"
            },
            {
              "fixed": "7c3f4ce651d43705f9ec7f778f642a90d5ff4fba"
            },
            {
              "fixed": "de2677e57d3161390d8a508f08cddec6ef7e4b23"
            },
            {
              "fixed": "1a0d9b406febf23054ad595fd47b29325e70fb2d"
            },
            {
              "fixed": "77906ac448d2fa81fa710ae26c0e591ebdc81154"
            },
            {
              "fixed": "44dab659064eb5c10adb0306510eebe848ed592d"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.6.0"
            },
            {
              "fixed": "5.10.271"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.222"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.189"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.158"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.112"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.54"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98344.json"
  },
  "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": "CVE-2026-98344",
  "modified": "2026-10-08T02:30:58.878871461Z",
  "published": "2026-10-06T08:46:33.997Z",
  "references": [
    {
      "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"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98344.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98344"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "dmaengine: Fix device kref underflow in dma_chan_put()"
}