CVE-2026-68214 (GCVE-0-2026-68214)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:00 – Updated: 2026-08-19 16:31
VLAI
Title
media: rtl2832: fix use-after-free in rtl2832_remove()
Summary
In the Linux kernel, the following vulnerability has been resolved: media: rtl2832: fix use-after-free in rtl2832_remove() cancel_delayed_work_sync() is called before i2c_mux_del_adapters() in rtl2832_remove(). While the cancel waits for any running instance of i2c_gate_work to finish, it does not prevent the timer from being rescheduled by a concurrent thread. During probe, the r820t_attach() call attempts I2C transfers through the mux adapter. These transfers go through i2c_mux_master_xfer(), which calls rtl2832_deselect() after the transfer completes, rescheduling i2c_gate_work via schedule_delayed_work(). If this transfer is still in flight when rtl2832_remove() runs, rtl2832_deselect() can reschedule i2c_gate_work after it has been cancelled, causing a use-after-free when kfree(dev) is called. Fix this by calling i2c_mux_del_adapters() before cancel_delayed_work_sync(). Once the mux adapter is unregistered, no new I2C transfers can go through it, so rtl2832_deselect() can no longer reschedule i2c_gate_work. The subsequent cancel_delayed_work_sync() is then guaranteed to be final.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: cddcc40b1b1553010acb89add84c64b5d123ec94 , < 1e8a6bc19403661661fed5ae82f6eca6c9cdfad2 (git)
Affected: cddcc40b1b1553010acb89add84c64b5d123ec94 , < 68a9c0290897c1436ddceb8cea604c93377a0299 (git)
Affected: cddcc40b1b1553010acb89add84c64b5d123ec94 , < 13c06056699e66ff7109ba68658cc6ea4a23f516 (git)
Affected: cddcc40b1b1553010acb89add84c64b5d123ec94 , < 9acd5bbbe1df8e487e49488692c224496d4c9e16 (git)
Affected: cddcc40b1b1553010acb89add84c64b5d123ec94 , < 24bef237eef8dd1ebcffb129ba21891ddad0d309 (git)
Affected: cddcc40b1b1553010acb89add84c64b5d123ec94 , < 2c71bda6edc630a1f8c3c45d8df5fc22d234e042 (git)
Affected: cddcc40b1b1553010acb89add84c64b5d123ec94 , < 90d781711418881f8c836c2a859cc2886625d750 (git)
Affected: cddcc40b1b1553010acb89add84c64b5d123ec94 , < 680daf40a82d483949f87f0d8f98639dc47e610c (git)
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Linux Linux Affected: 4.7
Unaffected: 0 , < 4.7 (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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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: rtl2832: fix use-after-free in rtl2832_remove()\n\ncancel_delayed_work_sync() is called before i2c_mux_del_adapters()\nin rtl2832_remove(). While the cancel waits for any running instance\nof i2c_gate_work to finish, it does not prevent the timer from being\nrescheduled by a concurrent thread.\n\nDuring probe, the r820t_attach() call attempts I2C transfers through\nthe mux adapter. These transfers go through i2c_mux_master_xfer(),\nwhich calls rtl2832_deselect() after the transfer completes,\nrescheduling i2c_gate_work via schedule_delayed_work(). If this\ntransfer is still in flight when rtl2832_remove() runs,\nrtl2832_deselect() can reschedule i2c_gate_work after it has been\ncancelled, causing a use-after-free when kfree(dev) is called.\n\nFix this by calling i2c_mux_del_adapters() before\ncancel_delayed_work_sync(). Once the mux adapter is unregistered, no\nnew I2C transfers can go through it, so rtl2832_deselect() can no\nlonger reschedule i2c_gate_work. The subsequent\ncancel_delayed_work_sync() is then guaranteed to be final."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "cveId": "CVE-2026-68214",
    "datePublished": "2026-08-10T12:00:33.539Z",
    "dateReserved": "2026-07-30T09:28:09.375Z",
    "dateUpdated": "2026-08-19T16:31:42.193Z",
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If this\\ntransfer is still in flight when rtl2832_remove() runs,\\nrtl2832_deselect() can reschedule i2c_gate_work after it has been\\ncancelled, causing a use-after-free when kfree(dev) is called.\\n\\nFix this by calling i2c_mux_del_adapters() before\\ncancel_delayed_work_sync(). Once the mux adapter is unregistered, no\\nnew I2C transfers can go through it, so rtl2832_deselect() can no\\nlonger reschedule i2c_gate_work. 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-14T14:01:10+00:00",
      "cve": "CVE-2026-68214",
      "id": "CVE-2026-68214",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "49",
      "product_status:known_not_affected": "227",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: media: rtl2832: fix use-after-free in rtl2832_remove()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68214.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-14T00:53:14Z",
      "cve": "CVE-2026-68214",
      "id": "CVE-2026-68214",
      "initial_release_date": "2026-08-13T16:22:49Z",
      "product_status:known_affected": "203",
      "product_status:known_not_affected": "93",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68214",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68214.json",
      "version": "3"
    }
  }
}



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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

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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.