CVE-2026-89871 (GCVE-0-2026-89871)
Vulnerability from cvelistv5
Published
2026-09-16 10:31
Modified
2026-10-19 08:54
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: media: video-i2c: fix kthread error pointer left in kthread_vid_cap on failure kthread_run() returns an ERR_PTR on failure, not NULL. When start_streaming() fails, data->kthread_vid_cap is left holding this error pointer instead of being cleared. This causes two subsequent bugs: 1. A future call to start_streaming() sees a non-NULL kthread_vid_cap and returns 0 (success) immediately, without actually starting the capture thread. 2. A call to stop_streaming() checks 'kthread_vid_cap == NULL' which is false for an error pointer, and proceeds to call kthread_stop() on the error pointer, leading to a kernel crash. Fix this by resetting kthread_vid_cap to NULL on failure before jumping to the error path.
References
Impacted products
Vendor Product Version
Linux Linux Version: 5cebaac609744414463d1ecc28fdecd26c1b9bc1
Version: 5cebaac609744414463d1ecc28fdecd26c1b9bc1
Version: 5cebaac609744414463d1ecc28fdecd26c1b9bc1
Version: 5cebaac609744414463d1ecc28fdecd26c1b9bc1
Version: 5cebaac609744414463d1ecc28fdecd26c1b9bc1
Version: 5cebaac609744414463d1ecc28fdecd26c1b9bc1
Version: 5cebaac609744414463d1ecc28fdecd26c1b9bc1
Version: 5cebaac609744414463d1ecc28fdecd26c1b9bc1
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
            "drivers/media/i2c/video-i2c.c"
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      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: video-i2c: fix kthread error pointer left in kthread_vid_cap on failure\n\nkthread_run() returns an ERR_PTR on failure, not NULL.\nWhen start_streaming() fails, data-\u003ekthread_vid_cap is left holding\nthis error pointer instead of being cleared.\n\nThis causes two subsequent bugs:\n1. A future call to start_streaming() sees a non-NULL kthread_vid_cap\n   and returns 0 (success) immediately, without actually starting the\n   capture thread.\n2. A call to stop_streaming() checks \u0027kthread_vid_cap == NULL\u0027 which\n   is false for an error pointer, and proceeds to call kthread_stop()\n   on the error pointer, leading to a kernel crash.\n\nFix this by resetting kthread_vid_cap to NULL on failure before\njumping to the error path."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:54:04.386Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/db0f4531aa55cfb0171684ebfffe3ff04b79d5a8"
        },
        {
          "url": "https://git.kernel.org/stable/c/0fac63cac6689588da530764ccb6ba55ee8e4d8b"
        },
        {
          "url": "https://git.kernel.org/stable/c/5c35d380bea60503c4fe0986fe1de6a3263282b3"
        },
        {
          "url": "https://git.kernel.org/stable/c/3d1b10d81fe54852ed953f4129577b733bbd6907"
        },
        {
          "url": "https://git.kernel.org/stable/c/968c5213e34c48d35febdfd09cf3dc58ad039140"
        },
        {
          "url": "https://git.kernel.org/stable/c/52fd9d80c0cea7bf09e7ee36cad316e5c39b7fe6"
        },
        {
          "url": "https://git.kernel.org/stable/c/0e7f2cd72a4f9268ee09a13b13f3339e7cc71557"
        },
        {
          "url": "https://git.kernel.org/stable/c/76e379754ba618989f6215be608d5c04774a611d"
        }
      ],
      "title": "media: video-i2c: fix kthread error pointer left in kthread_vid_cap on failure",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89871",
    "datePublished": "2026-09-16T10:31:39.961Z",
    "dateReserved": "2026-09-11T19:38:34.772Z",
    "dateUpdated": "2026-10-19T08:54:04.386Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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