{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f"
            },
            {
              "fixed": "6865d79fca17a80fbd60c12550ca9a5e0e20e0eb"
            },
            {
              "fixed": "510497e31be4f241103507315a859e2085ccb081"
            },
            {
              "fixed": "8b3e221590181a8beb3735bbabf166df02c839b5"
            },
            {
              "fixed": "f25ec4627d935dedfb5fe83bd2c2678cdcc19611"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.11.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.51"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89940.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\niio: buffer: Tie IIO dma fence lock lifetime to the fence\n\nThe `iio_dma_fence` implementation currently uses a lock embedded in the\n`iio_dmabuf_priv`. But the `iio_dma_fence` can outlive the\n`iio_dmabuf_priv`, which can cause a use-after-free.\n\nTie the lifetime of the lock to the lifetime of the fence by embedding them\nin the same struct.\n\nWe can't just hold a reference to the `iio_dmabuf_priv` from the\n`iio_dma_fence` since `iio_buffer_dmabuf_release()` might sleep and the\nfence release callback is not allowed to sleep.\n\nNote that the `dma_fence` framework now has an internal lock that gets used\nwhen the passing `NULL` for `lock` in `dma_fence_init()`, but in order to\nallow this patch to be backportable use an external lock.",
  "id": "CVE-2026-89940",
  "modified": "2026-09-18T03:31:01.461386827Z",
  "published": "2026-09-16T10:32:28.395Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/510497e31be4f241103507315a859e2085ccb081"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6865d79fca17a80fbd60c12550ca9a5e0e20e0eb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8b3e221590181a8beb3735bbabf166df02c839b5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f25ec4627d935dedfb5fe83bd2c2678cdcc19611"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89940.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89940"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "iio: buffer: Tie IIO dma fence lock lifetime to the fence"
}