CVE-2026-68222 (GCVE-0-2026-68222)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:00 – Updated: 2026-08-19 16:31
VLAI
Title
media: msi2500: Return queued buffers on start_streaming() failure
Summary
In the Linux kernel, the following vulnerability has been resolved: media: msi2500: 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. msi2500_start_streaming() had five error paths that all hit this trap and were further tangled by ret-overwriting between calls: - -ENODEV when the USB device was already disconnected - -ERESTARTSYS when mutex_lock_interruptible() was interrupted - msi2500_set_usb_adc() failure: ret was silently overwritten by the next call (msi2500_isoc_init), so the error was lost entirely - msi2500_isoc_init() failure: cleanup_queued_bufs was called, but the function then fell through to msi2500_ctrl_msg() and again masked the original error by overwriting ret - msi2500_ctrl_msg(CMD_START_STREAMING) failure: no cleanup at all, leaving isoc URBs submitted with no way for the driver to consume them Consolidate the error paths into a small goto chain. Every failure now stops the function, drains the queued-buffer list, and returns the real error code. The ctrl_msg failure path also rolls back the preceding msi2500_isoc_init() via msi2500_isoc_cleanup() before unlocking and draining. 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").
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: 977e444f59ad16eedf66acae4f357011c74da291 , < c74b680704baecea4620c0774de473069e0bc4e8 (git)
Affected: 977e444f59ad16eedf66acae4f357011c74da291 , < 2d10eedb786a13f91d76e11320fabb0bf712519f (git)
Affected: 977e444f59ad16eedf66acae4f357011c74da291 , < 2de14ddb4fea04ca616403a6ba81c5e8099e9b9e (git)
Affected: 977e444f59ad16eedf66acae4f357011c74da291 , < 1d58229b330b7f67fbfa07e0f2a8a51fbeafaa9a (git)
Affected: 977e444f59ad16eedf66acae4f357011c74da291 , < bab9d5a67d4db96ae8c187b92b37979911302a10 (git)
Affected: 977e444f59ad16eedf66acae4f357011c74da291 , < 264b5380c4f8aa92dbc2983ecd2b627f1d5e0061 (git)
Affected: 977e444f59ad16eedf66acae4f357011c74da291 , < 3673cb0a5711e910074d69201da9e1535c03f97a (git)
Affected: 977e444f59ad16eedf66acae4f357011c74da291 , < 7201c17786a498497bca57752883b90914d405ac (git)
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Linux Linux Affected: 3.12
Unaffected: 0 , < 3.12 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: msi2500: 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\nmsi2500_start_streaming() had five error paths that all hit this trap\nand were further tangled by ret-overwriting between calls:\n\n  - -ENODEV when the USB device was already disconnected\n  - -ERESTARTSYS when mutex_lock_interruptible() was interrupted\n  - msi2500_set_usb_adc() failure: ret was silently overwritten by\n    the next call (msi2500_isoc_init), so the error was lost entirely\n  - msi2500_isoc_init() failure: cleanup_queued_bufs was called, but\n    the function then fell through to msi2500_ctrl_msg() and again\n    masked the original error by overwriting ret\n  - msi2500_ctrl_msg(CMD_START_STREAMING) failure: no cleanup at all,\n    leaving isoc URBs submitted with no way for the driver to consume\n    them\n\nConsolidate the error paths into a small goto chain.  Every failure\nnow stops the function, drains the queued-buffer list, and returns\nthe real error code.  The ctrl_msg failure path also rolls back the\npreceding msi2500_isoc_init() via msi2500_isoc_cleanup() before\nunlocking and draining.\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\")."
        }
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        {
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            "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"
          },
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              "lang": "en",
              "value": "AV:L - The vulnerable code is reached only through a local VIDIOC_STREAMON ioctl on the msi2500 SDR character device /dev/swradioN; no network or remote input is involved, and the failure paths are driven from a local process\u0027s syscalls.\nAC:L - The attacker controls both sides of the trigger: hold dev-\u003ev4l2_lock from a second thread and send a signal to the STREAMON thread so mutex_lock_interruptible() returns -ERESTARTSYS, hitting the leaking error path deterministically and repeatably.\nPR:L - Only an unprivileged local user with access to the V4L2/SDR device node is needed; on desktop, Android and embedded systems these nodes are granted to the logged-in seat or a device group, and no capability check guards STREAMON.\nUI:N - The whole sequence (REQBUFS, QBUF, STREAMON, signal, repeat) is performed by the attacker\u0027s own process; no victim action such as plugging in hardware or opening a file is required.\nS:U - The corruption is confined to kernel memory managed by the same kernel security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:H - Buffers left on dev-\u003equeued_bufs after the vb2 core reclaims and later frees them become dangling pointers reused by cleanup_queued_bufs()/get_next_fill_buf(), giving a use-after-free that can be groomed to read reclaimed kernel heap contents back into userspace buffers.\nI:H - The stale list entries permit list_add_tail() on an already-linked node (list corruption) and vb2_buffer_done()/isoc-handler writes into freed objects, yielding attacker-influenced kernel heap writes exploitable for control-flow hijacking.\nA:H - At minimum the missing buffer return trips WARN_ON(owned_by_drv_count) (fatal with panic_on_warn) and leaks buffers; the resulting list corruption and use-after-free reliably oops or hang the kernel."
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        "dateUpdated": "2026-08-19T16:31:51.745Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/7201c17786a498497bca57752883b90914d405ac"
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      ],
      "title": "media: msi2500: Return queued buffers on start_streaming() failure",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68222",
    "datePublished": "2026-08-10T12:00:42.687Z",
    "dateReserved": "2026-07-30T09:28:09.375Z",
    "dateUpdated": "2026-08-19T16:31:51.745Z",
    "state": "PUBLISHED"
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      "date": "2026-08-20",
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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\\nmsi2500_start_streaming() had five error paths that all hit this trap\\nand were further tangled by ret-overwriting between calls:\\n\\n  - -ENODEV when the USB device was already disconnected\\n  - -ERESTARTSYS when mutex_lock_interruptible() was interrupted\\n  - msi2500_set_usb_adc() failure: ret was silently overwritten by\\n    the next call (msi2500_isoc_init), so the error was lost entirely\\n  - msi2500_isoc_init() failure: cleanup_queued_bufs was called, but\\n    the function then fell through to msi2500_ctrl_msg() and again\\n    masked the original error by overwriting ret\\n  - msi2500_ctrl_msg(CMD_START_STREAMING) failure: no cleanup at all,\\n    leaving isoc URBs submitted with no way for the driver to consume\\n    them\\n\\nConsolidate the error paths into a small goto chain.  Every failure\\nnow stops the function, drains the queued-buffer list, and returns\\nthe real error code.  The ctrl_msg failure path also rolls back the\\npreceding msi2500_isoc_init() via msi2500_isoc_cleanup() before\\nunlocking and draining.\\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\\\").\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/media/usb/msi2500/msi2500.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"977e444f59ad16eedf66acae4f357011c74da291\",\"lessThan\":\"c74b680704baecea4620c0774de473069e0bc4e8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"977e444f59ad16eedf66acae4f357011c74da291\",\"lessThan\":\"2d10eedb786a13f91d76e11320fabb0bf712519f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"977e444f59ad16eedf66acae4f357011c74da291\",\"lessThan\":\"2de14ddb4fea04ca616403a6ba81c5e8099e9b9e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"977e444f59ad16eedf66acae4f357011c74da291\",\"lessThan\":\"1d58229b330b7f67fbfa07e0f2a8a51fbeafaa9a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"977e444f59ad16eedf66acae4f357011c74da291\",\"lessThan\":\"bab9d5a67d4db96ae8c187b92b37979911302a10\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"977e444f59ad16eedf66acae4f357011c74da291\",\"lessThan\":\"264b5380c4f8aa92dbc2983ecd2b627f1d5e0061\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"977e444f59ad16eedf66acae4f357011c74da291\",\"lessThan\":\"3673cb0a5711e910074d69201da9e1535c03f97a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"977e444f59ad16eedf66acae4f357011c74da291\",\"lessThan\":\"7201c17786a498497bca57752883b90914d405ac\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/media/usb/msi2500/msi2500.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.148\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.101\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.42\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.6\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1d58229b330b7f67fbfa07e0f2a8a51fbeafaa9a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/264b5380c4f8aa92dbc2983ecd2b627f1d5e0061\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2d10eedb786a13f91d76e11320fabb0bf712519f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2de14ddb4fea04ca616403a6ba81c5e8099e9b9e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3673cb0a5711e910074d69201da9e1535c03f97a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7201c17786a498497bca57752883b90914d405ac\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bab9d5a67d4db96ae8c187b92b37979911302a10\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c74b680704baecea4620c0774de473069e0bc4e8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-14T14:01:18+00:00",
      "cve": "CVE-2026-68222",
      "id": "CVE-2026-68222",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "1",
      "product_status:known_not_affected": "275",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: media: msi2500: Return queued buffers on start_streaming() failure",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68222.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-08-18T16:55:54Z",
      "cve": "CVE-2026-68222",
      "id": "CVE-2026-68222",
      "initial_release_date": "2026-08-18T16:55:54Z",
      "product_status:known_affected": "193",
      "product_status:known_not_affected": "103",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68222",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68222.json",
      "version": "2"
    }
  }
}



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Tags
Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.