FKIE_CVE-2026-68213

Vulnerability from fkie_nvd - Published: 2026-08-10 13:20 - Updated: 2026-08-19 17:20
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: media: rtl2832_sdr: Return queued buffers on start_streaming() failure The vb2 framework hands buffers to the driver via buf_queue() before calling start_streaming(). If start_streaming() returns an error without first returning those buffers via vb2_buffer_done(), vb2_start_streaming() fires WARN_ON(owned_by_drv_count) and the queued buffers leak. rtl2832_sdr_start_streaming() had multiple error paths that hit this trap: two direct early returns (-ENODEV, -ERESTARTSYS), plus six `goto err` paths covering subdev s_power, tuner setup, ADC setup, stream-buffer allocation, urb allocation, and urb submission failures. None of them returned the queued buffers. The original function had no distinct success exit and fell straight through into the err label, which previously only did mutex_unlock and "return ret". Adding queued-buffer cleanup at err must therefore be paired with an explicit success return; otherwise every successful start would also drain the buffer queue and kill streaming. Add that success return, then add rtl2832_sdr_cleanup_queued_bufs() at the err label and before each early return. The cleanup helper takes a vb2_buffer_state argument so that the start_streaming error paths can pass VB2_BUF_STATE_QUEUED (as expected by userspace on start_streaming failure) while stop_streaming keeps its existing VB2_BUF_STATE_ERROR semantics. This mirrors the uvcvideo fix in commit 4cf3b6fd54eb ("media: uvcvideo: Return queued buffers on start_streaming() failure"). The err label still does not roll back power_ctrl(), frontend_ctrl(), the POWER_ON flag, or stream/URB allocations that may have happened before the failing step. Those are pre-existing leaks of a different class and are not addressed here.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0b08c0403cf672a121ace4eff647a9b240bd4e1b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/33ca0aab6f4bd90921fc1395478f38f72c4d19af
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/465dc8e71d2db2ed603e749fa71392bcdccf07eb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/772f2550fe32357557d3b2f88e02f7cf477f0789
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/894e83509c66910112b9eaeaa8cd66cd9806db91
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a248273f8af6e630a03e823274385725974009b5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fc0b18782aab4e35078efe72863df8eab46560a8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fd1e11fc3849169285e48b2d4ec441614ad2ea74
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/dvb-frontends/rtl2832_sdr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "fd1e11fc3849169285e48b2d4ec441614ad2ea74",
              "status": "affected",
              "version": "771138920eafa399f68d3492c8a75dfeea23474b",
              "versionType": "git"
            },
            {
              "lessThan": "772f2550fe32357557d3b2f88e02f7cf477f0789",
              "status": "affected",
              "version": "771138920eafa399f68d3492c8a75dfeea23474b",
              "versionType": "git"
            },
            {
              "lessThan": "a248273f8af6e630a03e823274385725974009b5",
              "status": "affected",
              "version": "771138920eafa399f68d3492c8a75dfeea23474b",
              "versionType": "git"
            },
            {
              "lessThan": "465dc8e71d2db2ed603e749fa71392bcdccf07eb",
              "status": "affected",
              "version": "771138920eafa399f68d3492c8a75dfeea23474b",
              "versionType": "git"
            },
            {
              "lessThan": "0b08c0403cf672a121ace4eff647a9b240bd4e1b",
              "status": "affected",
              "version": "771138920eafa399f68d3492c8a75dfeea23474b",
              "versionType": "git"
            },
            {
              "lessThan": "894e83509c66910112b9eaeaa8cd66cd9806db91",
              "status": "affected",
              "version": "771138920eafa399f68d3492c8a75dfeea23474b",
              "versionType": "git"
            },
            {
              "lessThan": "fc0b18782aab4e35078efe72863df8eab46560a8",
              "status": "affected",
              "version": "771138920eafa399f68d3492c8a75dfeea23474b",
              "versionType": "git"
            },
            {
              "lessThan": "33ca0aab6f4bd90921fc1395478f38f72c4d19af",
              "status": "affected",
              "version": "771138920eafa399f68d3492c8a75dfeea23474b",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/dvb-frontends/rtl2832_sdr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.15"
            },
            {
              "lessThan": "3.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.148",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "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\nmedia: rtl2832_sdr: Return queued buffers on start_streaming() failure\n\nThe vb2 framework hands buffers to the driver via buf_queue() before\ncalling start_streaming().  If start_streaming() returns an error\nwithout first returning those buffers via vb2_buffer_done(),\nvb2_start_streaming() fires WARN_ON(owned_by_drv_count) and the queued\nbuffers leak.\n\nrtl2832_sdr_start_streaming() had multiple error paths that hit this\ntrap: two direct early returns (-ENODEV, -ERESTARTSYS), plus six\n`goto err` paths covering subdev s_power, tuner setup, ADC setup,\nstream-buffer allocation, urb allocation, and urb submission failures.\nNone of them returned the queued buffers.\n\nThe original function had no distinct success exit and fell straight\nthrough into the err label, which previously only did mutex_unlock and\n\"return ret\".  Adding queued-buffer cleanup at err must therefore be\npaired with an explicit success return; otherwise every successful\nstart would also drain the buffer queue and kill streaming.  Add that\nsuccess return, then add rtl2832_sdr_cleanup_queued_bufs() at the err\nlabel and before each early return.\n\nThe cleanup helper takes a vb2_buffer_state argument so that the\nstart_streaming error paths can pass VB2_BUF_STATE_QUEUED (as\nexpected by userspace on start_streaming failure) while stop_streaming\nkeeps its existing VB2_BUF_STATE_ERROR semantics.\n\nThis mirrors the uvcvideo fix in commit 4cf3b6fd54eb (\"media: uvcvideo:\nReturn queued buffers on start_streaming() failure\").\n\nThe err label still does not roll back power_ctrl(), frontend_ctrl(),\nthe POWER_ON flag, or stream/URB allocations that may have happened\nbefore the failing step.  Those are pre-existing leaks of a different\nclass and are not addressed here."
    }
  ],
  "id": "CVE-2026-68213",
  "lastModified": "2026-08-19T17:20:37.227",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-10T13:20:09.147",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0b08c0403cf672a121ace4eff647a9b240bd4e1b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/33ca0aab6f4bd90921fc1395478f38f72c4d19af"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/465dc8e71d2db2ed603e749fa71392bcdccf07eb"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/772f2550fe32357557d3b2f88e02f7cf477f0789"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/894e83509c66910112b9eaeaa8cd66cd9806db91"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a248273f8af6e630a03e823274385725974009b5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fc0b18782aab4e35078efe72863df8eab46560a8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fd1e11fc3849169285e48b2d4ec441614ad2ea74"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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