CVE-2026-99035 (GCVE-0-2026-99035)
Vulnerability from cvelistv5
Published
2026-10-23 12:21
Modified
2026-10-30 12:41
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: mmc: mtk-sd: Cancel request timeout work on remove The driver queues req_timeout while a request is active. msdc_request_done() uses cancel_delayed_work(), which does not wait for a timeout callback that has already started. The timeout callback calls mmc_request_done(), which wakes the request waiter, and then continues to use host->dev_comp and check the SDIO IRQ. During unbind, msdc_drv_remove() can return and the managed mmc_host can be freed before the callback finishes. KASAN reported use-after-free accesses in msdc_request_done() and msdc_recheck_sdio_irq() in each of three unbind tests. The same tests completed without a kernel diagnostic after this change. Call cancel_delayed_work_sync() after mmc_remove_host() has stopped new requests and before the driver releases the host resources.
References
Impacted products
Vendor Product Version
Linux Linux Version: 208489032bdd8d4a7de50f3057c175058f271956
Version: 208489032bdd8d4a7de50f3057c175058f271956
Version: 208489032bdd8d4a7de50f3057c175058f271956
Version: 208489032bdd8d4a7de50f3057c175058f271956
Version: 208489032bdd8d4a7de50f3057c175058f271956
Version: 208489032bdd8d4a7de50f3057c175058f271956
Version: 208489032bdd8d4a7de50f3057c175058f271956
Version: 208489032bdd8d4a7de50f3057c175058f271956
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{
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          "programFiles": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmmc: mtk-sd: Cancel request timeout work on remove\n\nThe driver queues req_timeout while a request is active.\nmsdc_request_done() uses cancel_delayed_work(), which does not wait for\na timeout callback that has already started.\n\nThe timeout callback calls mmc_request_done(), which wakes the request\nwaiter, and then continues to use host-\u003edev_comp and check the SDIO IRQ.\nDuring unbind, msdc_drv_remove() can return and the managed mmc_host can\nbe freed before the callback finishes.\n\nKASAN reported use-after-free accesses in msdc_request_done() and\nmsdc_recheck_sdio_irq() in each of three unbind tests.  The same tests\ncompleted without a kernel diagnostic after this change.\n\nCall cancel_delayed_work_sync() after mmc_remove_host() has stopped new\nrequests and before the driver releases the host resources."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:41:08.346Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d8ce81006ee4e42ce2d0bd3a2ab87adc1e24ef11"
        },
        {
          "url": "https://git.kernel.org/stable/c/2cff6a2a912a3464ae1fefb7e0a82393682ccea6"
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        {
          "url": "https://git.kernel.org/stable/c/e5d82695f2cabca3222b8f6a89ea0e18bafc4c0a"
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        {
          "url": "https://git.kernel.org/stable/c/9e799f25c420e759641eb25102967ea091fc758f"
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          "url": "https://git.kernel.org/stable/c/f37e0367ad6f2147a0b37564b442b7a25bec0d23"
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          "url": "https://git.kernel.org/stable/c/46e75703ca3f00fb8c935b3ce35b90836e34e8af"
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        {
          "url": "https://git.kernel.org/stable/c/edef1355224c0799a502a46b71d3649fa0dd218e"
        },
        {
          "url": "https://git.kernel.org/stable/c/b38af5386a74416e898955443f2e26547b358cb2"
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      ],
      "title": "mmc: mtk-sd: Cancel request timeout work on remove",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-99035",
    "datePublished": "2026-10-23T12:21:44.522Z",
    "dateReserved": "2026-09-25T10:25:14.387Z",
    "dateUpdated": "2026-10-30T12:41:08.346Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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