CVE-2026-89880 (GCVE-0-2026-89880)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:31 – Updated: 2026-09-16 14:39
VLAI
Title
media: rtl2832_sdr: release URBs and stream buffers on start_streaming() failure
Summary
In the Linux kernel, the following vulnerability has been resolved: media: rtl2832_sdr: release URBs and stream buffers on start_streaming() failure rtl2832_sdr_start_streaming() calls rtl2832_sdr_alloc_stream_bufs(), rtl2832_sdr_alloc_urbs() and rtl2832_sdr_submit_urbs() in sequence and shares a single err: label that only unlocks the mutex and returns. When alloc_urbs() succeeds but submit_urbs() fails, or when alloc_urbs() itself returns -ENOMEM after alloc_stream_bufs() has already succeeded, the URBs and/or the coherent DMA stream buffers stay allocated while streaming reports failure to vb2. Two latent defects follow on the next VIDIOC_STREAMON: 1) rtl2832_sdr_alloc_stream_bufs() unconditionally resets dev->buf_num to 0 and overwrites dev->buf_list[]/dev->dma_addr[], permanently leaking the coherent DMA memory allocated by the previous attempt. 2) rtl2832_sdr_alloc_urbs() never resets dev->urbs_initialized and only increments it. After a second successful pass urbs_initialized can exceed MAX_BULK_BUFS, so the subsequent rtl2832_sdr_free_urbs() walks from urbs_initialized - 1 down to 0 and reads past the end of dev->urb_list[], passing garbage pointers to usb_free_urb(). Mirror the teardown that stop_streaming() already performs: on the error path call rtl2832_sdr_free_urbs() and rtl2832_sdr_free_stream_bufs() before unlocking. Both helpers are idempotent (free_urbs kills and zeros urbs_initialized; free_stream_bufs is gated on URB_BUF and clears the buf_num counter), so partial-failure paths and the no-allocation paths remain safe. Issue identified by automated review of the INV-003 series at https://sashiko.dev/
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 771138920eafa399f68d3492c8a75dfeea23474b , < f14a713a36a5c87568430e9770896f2a8f5bbbb7 (git)
Affected: 771138920eafa399f68d3492c8a75dfeea23474b , < c819dea3a433ae790b829443fdcc1715d1586560 (git)
Affected: 771138920eafa399f68d3492c8a75dfeea23474b , < 0337ab0759285076a3f9dcfcc40906e69ab519b3 (git)
Affected: 771138920eafa399f68d3492c8a75dfeea23474b , < c91e8ae2b39c6da81f26f2c9877d3fd33a4465ce (git)
Affected: 771138920eafa399f68d3492c8a75dfeea23474b , < 8bcf11a239eac4e224ad856277de9a36c91b1711 (git)
Affected: 771138920eafa399f68d3492c8a75dfeea23474b , < 26a2a985bbeee3eaa6f80ff7de732161a171ec9f (git)
Affected: 771138920eafa399f68d3492c8a75dfeea23474b , < ac02b2c56ccef0788cea9b86990a8f349a3fc6d8 (git)
Affected: 771138920eafa399f68d3492c8a75dfeea23474b , < fe50cdaebf12cd32ff9a44d92bfd6fbc2300dbd4 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.15
Unaffected: 0 , < 3.15 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.51 , ≤ 6.18.* (semver)
Unaffected: 7.2.5 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
  "containers": {
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          "product": "Linux",
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: rtl2832_sdr: release URBs and stream buffers on start_streaming() failure\n\nrtl2832_sdr_start_streaming() calls rtl2832_sdr_alloc_stream_bufs(),\nrtl2832_sdr_alloc_urbs() and rtl2832_sdr_submit_urbs() in sequence and\nshares a single err: label that only unlocks the mutex and returns.\nWhen alloc_urbs() succeeds but submit_urbs() fails, or when alloc_urbs()\nitself returns -ENOMEM after alloc_stream_bufs() has already succeeded,\nthe URBs and/or the coherent DMA stream buffers stay allocated while\nstreaming reports failure to vb2. Two latent defects follow on the next\nVIDIOC_STREAMON:\n\n1) rtl2832_sdr_alloc_stream_bufs() unconditionally resets dev-\u003ebuf_num\n   to 0 and overwrites dev-\u003ebuf_list[]/dev-\u003edma_addr[], permanently\n   leaking the coherent DMA memory allocated by the previous attempt.\n\n2) rtl2832_sdr_alloc_urbs() never resets dev-\u003eurbs_initialized and only\n   increments it. After a second successful pass urbs_initialized can\n   exceed MAX_BULK_BUFS, so the subsequent rtl2832_sdr_free_urbs() walks\n   from urbs_initialized - 1 down to 0 and reads past the end of\n   dev-\u003eurb_list[], passing garbage pointers to usb_free_urb().\n\nMirror the teardown that stop_streaming() already performs: on the error\npath call rtl2832_sdr_free_urbs() and rtl2832_sdr_free_stream_bufs()\nbefore unlocking. Both helpers are idempotent (free_urbs kills and zeros\nurbs_initialized; free_stream_bufs is gated on URB_BUF and clears the\nbuf_num counter), so partial-failure paths and the no-allocation paths\nremain safe.\n\nIssue identified by automated review of the INV-003 series at\nhttps://sashiko.dev/"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The flaw is reached only through local V4L2 ioctls (VIDIOC_REQBUFS, VIDIOC_QBUF, VIDIOC_STREAMON) on the rtl2832_sdr /dev/swradioN node; USB bulk packets from the dongle never enter this start_streaming() error path.\nAC:L - The attacker drives both STREAMON attempts and can force the first submit_urbs() failure via USBDEVFS_RESET/DISCONNECT on the matching usbfs node or GFP_KERNEL memory pressure, then retry STREAMON; no race or layout outside their control is required.\nPR:L - v4l2_fh_open() and vb2_ioctl_streamon() perform no capability checks; only the SDR device node is needed, and udev uaccess/video-group rules grant it to unprivileged seat users on desktops, Android, and embedded RTL-SDR systems.\nUI:N - The attacking process issues REQBUFS/QBUF/STREAMON (and any usbfs reset) on its own file descriptors against an already-attached RTL2832; no separate victim action such as plugging in the dongle or opening a file is required.\nS:U - The urb_list[] overrun, leaked coherent DMA buffers, and resulting usb_submit_urb()/usb_free_urb() misuse stay in host kernel memory in the same OS security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - After a failed STREAMON, a second alloc_urbs() leaves urbs_initialized above MAX_BULK_BUFS, so submit_urbs()/free_urbs() read past urb_list[] and treat adjacent kernel fields (including live buf_list[] DMA pointers) as struct urb objects, an out-of-bounds/type-confused kernel read.\nI:H - usb_submit_urb() writes urb-\u003eep/status/transfer_flags through those OOB-derived pointers, and the subsequent free_urbs() walk passes the same garbage to usb_free_urb()/kref_put, a type-confusion/slab-corruption write primitive suitable for control-flow hijack.\nA:H - usb_submit_urb() of the first out-of-bounds slot oopses the kernel (near-NULL from buf_num), and the attacker can repeat STREAMON after a forced submit failure to panic or hang the host at will."
            }
          ]
        }
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      "providerMetadata": {
        "dateUpdated": "2026-09-16T14:39:31.925Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/c819dea3a433ae790b829443fdcc1715d1586560"
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        {
          "url": "https://git.kernel.org/stable/c/0337ab0759285076a3f9dcfcc40906e69ab519b3"
        },
        {
          "url": "https://git.kernel.org/stable/c/c91e8ae2b39c6da81f26f2c9877d3fd33a4465ce"
        },
        {
          "url": "https://git.kernel.org/stable/c/8bcf11a239eac4e224ad856277de9a36c91b1711"
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        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/fe50cdaebf12cd32ff9a44d92bfd6fbc2300dbd4"
        }
      ],
      "title": "media: rtl2832_sdr: release URBs and stream buffers on start_streaming() failure",
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        "engine": "bippy-1.2.0"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89880",
    "datePublished": "2026-09-16T10:31:46.260Z",
    "dateReserved": "2026-09-11T19:38:34.772Z",
    "dateUpdated": "2026-09-16T14:39:31.925Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2",
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      "date": "2026-09-25",
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      "percentile": "0.0635"
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: rtl2832_sdr: release URBs and stream buffers on start_streaming() failure\n\nrtl2832_sdr_start_streaming() calls rtl2832_sdr_alloc_stream_bufs(),\nrtl2832_sdr_alloc_urbs() and rtl2832_sdr_submit_urbs() in sequence and\nshares a single err: label that only unlocks the mutex and returns.\nWhen alloc_urbs() succeeds but submit_urbs() fails, or when alloc_urbs()\nitself returns -ENOMEM after alloc_stream_bufs() has already succeeded,\nthe URBs and/or the coherent DMA stream buffers stay allocated while\nstreaming reports failure to vb2. Two latent defects follow on the next\nVIDIOC_STREAMON:\n\n1) rtl2832_sdr_alloc_stream_bufs() unconditionally resets dev-\u003ebuf_num\n   to 0 and overwrites dev-\u003ebuf_list[]/dev-\u003edma_addr[], permanently\n   leaking the coherent DMA memory allocated by the previous attempt.\n\n2) rtl2832_sdr_alloc_urbs() never resets dev-\u003eurbs_initialized and only\n   increments it. After a second successful pass urbs_initialized can\n   exceed MAX_BULK_BUFS, so the subsequent rtl2832_sdr_free_urbs() walks\n   from urbs_initialized - 1 down to 0 and reads past the end of\n   dev-\u003eurb_list[], passing garbage pointers to usb_free_urb().\n\nMirror the teardown that stop_streaming() already performs: on the error\npath call rtl2832_sdr_free_urbs() and rtl2832_sdr_free_stream_bufs()\nbefore unlocking. Both helpers are idempotent (free_urbs kills and zeros\nurbs_initialized; free_stream_bufs is gated on URB_BUF and clears the\nbuf_num counter), so partial-failure paths and the no-allocation paths\nremain safe.\n\nIssue identified by automated review of the INV-003 series at\nhttps://sashiko.dev/"
          }
        ],
        "id": "CVE-2026-89880",
        "lastModified": "2026-09-16T15:18:14.700",
        "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": "2026-09-16T11:16:56.363",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/0337ab0759285076a3f9dcfcc40906e69ab519b3"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/26a2a985bbeee3eaa6f80ff7de732161a171ec9f"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/8bcf11a239eac4e224ad856277de9a36c91b1711"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ac02b2c56ccef0788cea9b86990a8f349a3fc6d8"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c819dea3a433ae790b829443fdcc1715d1586560"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c91e8ae2b39c6da81f26f2c9877d3fd33a4465ce"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f14a713a36a5c87568430e9770896f2a8f5bbbb7"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/fe50cdaebf12cd32ff9a44d92bfd6fbc2300dbd4"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.