{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "771138920eafa399f68d3492c8a75dfeea23474b"
            },
            {
              "fixed": "234c46b95a032232e31fa5987b84fb8f87a9693b"
            },
            {
              "fixed": "034b6a4f9589c04bc3f2bd5125658cd72d3e17c8"
            },
            {
              "fixed": "0ef9f19010ae4ba93aca211ea8f0081b9bf7aab2"
            },
            {
              "fixed": "053581d4657c6b5289c5de71a4828d313c005189"
            },
            {
              "fixed": "bbf15e83c37d9ac938b7c35c02b748fe54230010"
            },
            {
              "fixed": "7443b16b6dd8889a3b9c5236a09e7c58f0d11dae"
            },
            {
              "fixed": "a0d9d9a3b41a1346c26af57aade6ba3f552fa171"
            },
            {
              "fixed": "dabb047c62668f280998e29117c55e41aabac336"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.15.0"
            },
            {
              "fixed": "5.10.270"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.221"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "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-2026-89881.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: rtl2832_sdr: use vb2_video_unregister_device() on remove to fix DMA leak\n\nrtl2832_sdr_remove() runs on USB disconnect and clears dev-\u003eudev to\nNULL before any pending streaming teardown has run. When user space\nlater closes its file descriptor, vb2 calls rtl2832_sdr_stop_streaming()\nwhich in turn calls rtl2832_sdr_free_stream_bufs(). That helper releases\neach coherent buffer with:\n\n    usb_free_coherent(dev-\u003eudev, dev-\u003ebuf_size,\n                      dev-\u003ebuf_list[dev-\u003ebuf_num],\n                      dev-\u003edma_addr[dev-\u003ebuf_num]);\n\nusb_free_coherent() returns immediately when its dev argument is NULL,\nso every DMA stream buffer that was live at disconnect is silently\nleaked. The URBs allocated in rtl2832_sdr_alloc_urbs() outlive the\ndevice for the same reason.\n\nThe rtl2832_sdr driver uses vb2_fop_release() in its file_operations,\nso replace video_unregister_device(\u0026dev-\u003evdev) with\nvb2_video_unregister_device(\u0026dev-\u003evdev) and move it before clearing\ndev-\u003eudev. vb2_video_unregister_device() releases the vb2 queue, which\nsynchronously runs rtl2832_sdr_stop_streaming() if streaming is active,\nso URBs and coherent DMA stream buffers are freed while dev-\u003eudev is\nstill valid.\n\nvb2_video_unregister_device() locks vdev-\u003equeue-\u003elock (vb_queue_lock)\ninternally, and stop_streaming() locks v4l2_lock, so the previous outer\nmutex_lock(\u0026dev-\u003evb_queue_lock) / mutex_lock(\u0026dev-\u003ev4l2_lock) pair\naround the unregister sequence would self-deadlock and has been removed.\nA short v4l2_lock critical section around dev-\u003eudev = NULL remains so\nany ioctl path that still holds the file descriptor sees coherent state.\n\nIssue identified by automated review of the INV-003 series at\nhttps://sashiko.dev/",
  "id": "CVE-2026-89881",
  "modified": "2026-09-18T03:30:44.875412167Z",
  "published": "2026-09-16T10:31:46.966Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/034b6a4f9589c04bc3f2bd5125658cd72d3e17c8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/053581d4657c6b5289c5de71a4828d313c005189"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0ef9f19010ae4ba93aca211ea8f0081b9bf7aab2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/234c46b95a032232e31fa5987b84fb8f87a9693b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7443b16b6dd8889a3b9c5236a09e7c58f0d11dae"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a0d9d9a3b41a1346c26af57aade6ba3f552fa171"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bbf15e83c37d9ac938b7c35c02b748fe54230010"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dabb047c62668f280998e29117c55e41aabac336"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89881.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89881"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "media: rtl2832_sdr: use vb2_video_unregister_device() on remove to fix DMA leak"
}