CVE-2026-89871 (GCVE-0-2026-89871)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:31 – Updated: 2026-09-16 10:31
VLAI
Title
media: video-i2c: fix kthread error pointer left in kthread_vid_cap on failure
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5cebaac609744414463d1ecc28fdecd26c1b9bc1 , < db0f4531aa55cfb0171684ebfffe3ff04b79d5a8 (git)
Affected: 5cebaac609744414463d1ecc28fdecd26c1b9bc1 , < 0fac63cac6689588da530764ccb6ba55ee8e4d8b (git)
Affected: 5cebaac609744414463d1ecc28fdecd26c1b9bc1 , < 5c35d380bea60503c4fe0986fe1de6a3263282b3 (git)
Affected: 5cebaac609744414463d1ecc28fdecd26c1b9bc1 , < 3d1b10d81fe54852ed953f4129577b733bbd6907 (git)
Affected: 5cebaac609744414463d1ecc28fdecd26c1b9bc1 , < 968c5213e34c48d35febdfd09cf3dc58ad039140 (git)
Affected: 5cebaac609744414463d1ecc28fdecd26c1b9bc1 , < 52fd9d80c0cea7bf09e7ee36cad316e5c39b7fe6 (git)
Affected: 5cebaac609744414463d1ecc28fdecd26c1b9bc1 , < 0e7f2cd72a4f9268ee09a13b13f3339e7cc71557 (git)
Affected: 5cebaac609744414463d1ecc28fdecd26c1b9bc1 , < 76e379754ba618989f6215be608d5c04774a611d (git)
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Linux Linux Affected: 4.18
Unaffected: 0 , < 4.18 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.51 , ≤ 6.18.* (semver)
Unaffected: 7.2.5 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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          "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."
        }
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      "providerMetadata": {
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    "datePublished": "2026-09-16T10:31:39.961Z",
    "dateReserved": "2026-09-11T19:38:34.772Z",
    "dateUpdated": "2026-09-16T10:31:39.961Z",
    "state": "PUBLISHED"
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      "source": "Microsoft CSAF VEX",
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          }
        ],
        "id": "CVE-2026-89871",
        "lastModified": "2026-09-16T11:16:55.287",
        "metrics": {},
        "published": "2026-09-16T11:16:55.287",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
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}



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