FKIE_CVE-2026-68214

Vulnerability from fkie_nvd - Published: 2026-08-10 13:20 - Updated: 2026-08-19 17:20
Severity
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/13c06056699e66ff7109ba68658cc6ea4a23f516
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1e8a6bc19403661661fed5ae82f6eca6c9cdfad2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/24bef237eef8dd1ebcffb129ba21891ddad0d309
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2c71bda6edc630a1f8c3c45d8df5fc22d234e042
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/680daf40a82d483949f87f0d8f98639dc47e610c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/68a9c0290897c1436ddceb8cea604c93377a0299
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/90d781711418881f8c836c2a859cc2886625d750
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9acd5bbbe1df8e487e49488692c224496d4c9e16
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/dvb-frontends/rtl2832.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "1e8a6bc19403661661fed5ae82f6eca6c9cdfad2",
              "status": "affected",
              "version": "cddcc40b1b1553010acb89add84c64b5d123ec94",
              "versionType": "git"
            },
            {
              "lessThan": "68a9c0290897c1436ddceb8cea604c93377a0299",
              "status": "affected",
              "version": "cddcc40b1b1553010acb89add84c64b5d123ec94",
              "versionType": "git"
            },
            {
              "lessThan": "13c06056699e66ff7109ba68658cc6ea4a23f516",
              "status": "affected",
              "version": "cddcc40b1b1553010acb89add84c64b5d123ec94",
              "versionType": "git"
            },
            {
              "lessThan": "9acd5bbbe1df8e487e49488692c224496d4c9e16",
              "status": "affected",
              "version": "cddcc40b1b1553010acb89add84c64b5d123ec94",
              "versionType": "git"
            },
            {
              "lessThan": "24bef237eef8dd1ebcffb129ba21891ddad0d309",
              "status": "affected",
              "version": "cddcc40b1b1553010acb89add84c64b5d123ec94",
              "versionType": "git"
            },
            {
              "lessThan": "2c71bda6edc630a1f8c3c45d8df5fc22d234e042",
              "status": "affected",
              "version": "cddcc40b1b1553010acb89add84c64b5d123ec94",
              "versionType": "git"
            },
            {
              "lessThan": "90d781711418881f8c836c2a859cc2886625d750",
              "status": "affected",
              "version": "cddcc40b1b1553010acb89add84c64b5d123ec94",
              "versionType": "git"
            },
            {
              "lessThan": "680daf40a82d483949f87f0d8f98639dc47e610c",
              "status": "affected",
              "version": "cddcc40b1b1553010acb89add84c64b5d123ec94",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/dvb-frontends/rtl2832.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.7"
            },
            {
              "lessThan": "4.7",
              "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: 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."
    }
  ],
  "id": "CVE-2026-68214",
  "lastModified": "2026-08-19T17:20:37.390",
  "metrics": {},
  "published": "2026-08-10T13:20:09.287",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/13c06056699e66ff7109ba68658cc6ea4a23f516"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1e8a6bc19403661661fed5ae82f6eca6c9cdfad2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/24bef237eef8dd1ebcffb129ba21891ddad0d309"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2c71bda6edc630a1f8c3c45d8df5fc22d234e042"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/680daf40a82d483949f87f0d8f98639dc47e610c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/68a9c0290897c1436ddceb8cea604c93377a0299"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/90d781711418881f8c836c2a859cc2886625d750"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9acd5bbbe1df8e487e49488692c224496d4c9e16"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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