CVE-2026-98749 (GCVE-0-2026-98749)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:47 – Updated: 2026-10-21 12:56
VLAI
Title
tty: serial: max3100: shut down timer before freeing port
Summary
In the Linux kernel, the following vulnerability has been resolved: tty: serial: max3100: shut down timer before freeing port max3100_shutdown() stops the polling timer but returns early during system suspend. If the SPI device is unbound before resume, the serial core does not call max3100_shutdown() again, so max3100_remove() frees the port while the timer remains armed. max3100_timeout() may then access the freed port and re-arm the timer. Add final timer teardown to max3100_remove() and use timer_shutdown_sync() to prevent a racing callback from re-arming it. Also free the IRQ and destroy the workqueue there before freeing the port. Keep timer_delete_sync() in max3100_shutdown() so that a subsequent open() can re-arm the timer. The workqueue is created before request_irq() and destroyed on both request_irq() failure and normal shutdown. Its presence at remove thus identifies the IRQ left registered when suspend bypasses shutdown. Free the IRQ before destroying the workqueue, in both max3100_shutdown() and max3100_remove(), and cancel the pending work in between. free_irq() waits for a running interrupt handler to finish and no new handler can start afterwards, so a racing handler cannot queue work on a workqueue that is being destroyed; the force_end_work check in max3100_dowork() only narrows that window, as a handler delayed between the check and queue_work() could still run after the teardown has cleared the workqueue pointer. Cancelling the work also keeps destroy_workqueue() from waiting on a queued work item in case remove() ever runs while the freezable workqueue is still frozen, e.g. device removal during the resume window, before workqueues are thawed. This issue was found by an in-house static analysis tool.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7063 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7831d56b0a3544cbb6f82f76c34ca95e24d5b676 , < 158a07da2da720f2f98b4bea129212c6805d8ee0 (git)
Affected: 7831d56b0a3544cbb6f82f76c34ca95e24d5b676 , < fb668620e3b163962dabe1a674725a07aa44ff4a (git)
Affected: 7831d56b0a3544cbb6f82f76c34ca95e24d5b676 , < 2c8614981d3e6e000427de0ab2426ab68274d850 (git)
Affected: 7831d56b0a3544cbb6f82f76c34ca95e24d5b676 , < 247b8f680876313586aed4d267bfcceddc2b4901 (git)
Affected: 7831d56b0a3544cbb6f82f76c34ca95e24d5b676 , < db0949bbd06db0a75b4b1076f1e25194be7d956a (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.30
Unaffected: 0 , < 2.6.30 (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.113 , ≤ 6.12.* (semver)
Unaffected: 6.18.56 , ≤ 6.18.* (semver)
Unaffected: 7.2.10 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "programFiles": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntty: serial: max3100: shut down timer before freeing port\n\nmax3100_shutdown() stops the polling timer but returns early during\nsystem suspend. If the SPI device is unbound before resume, the serial\ncore does not call max3100_shutdown() again, so max3100_remove() frees\nthe port while the timer remains armed. max3100_timeout() may then\naccess the freed port and re-arm the timer.\n\nAdd final timer teardown to max3100_remove() and use\ntimer_shutdown_sync() to prevent a racing callback from re-arming it.\nAlso free the IRQ and destroy the workqueue there before freeing the\nport. Keep timer_delete_sync() in max3100_shutdown() so that a\nsubsequent open() can re-arm the timer.\n\nThe workqueue is created before request_irq() and destroyed on both\nrequest_irq() failure and normal shutdown. Its presence at remove thus\nidentifies the IRQ left registered when suspend bypasses shutdown.\n\nFree the IRQ before destroying the workqueue, in both\nmax3100_shutdown() and max3100_remove(), and cancel the pending work\nin between. free_irq() waits for a running interrupt handler to\nfinish and no new handler can start afterwards, so a racing handler\ncannot queue work on a workqueue that is being destroyed; the\nforce_end_work check in max3100_dowork() only narrows that window, as\na handler delayed between the check and queue_work() could still run\nafter the teardown has cleared the workqueue pointer. Cancelling the\nwork also keeps destroy_workqueue() from waiting on a queued work item\nin case remove() ever runs while the freezable workqueue is still\nfrozen, e.g. device removal during the resume window, before\nworkqueues are thawed.\n\nThis issue was found by an in-house static analysis tool."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:56:24.499Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/158a07da2da720f2f98b4bea129212c6805d8ee0"
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          "url": "https://git.kernel.org/stable/c/fb668620e3b163962dabe1a674725a07aa44ff4a"
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          "url": "https://git.kernel.org/stable/c/db0949bbd06db0a75b4b1076f1e25194be7d956a"
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      "title": "tty: serial: max3100: shut down timer before freeing port",
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    "datePublished": "2026-10-18T15:47:34.347Z",
    "dateReserved": "2026-09-25T10:25:14.368Z",
    "dateUpdated": "2026-10-21T12:56:24.499Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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      "date": "2026-10-27",
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      "percentile": "0.07076"
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      "cve": "CVE-2026-98749",
      "id": "msrc_CVE-2026-98749",
      "initial_release_date": "2026-10-20T01:08:23.000Z",
      "product_status:known_affected": "1",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "tty: serial: max3100: shut down timer before freeing port",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98749.json",
      "version": "3"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntty: serial: max3100: shut down timer before freeing port\n\nmax3100_shutdown() stops the polling timer but returns early during\nsystem suspend. If the SPI device is unbound before resume, the serial\ncore does not call max3100_shutdown() again, so max3100_remove() frees\nthe port while the timer remains armed. max3100_timeout() may then\naccess the freed port and re-arm the timer.\n\nAdd final timer teardown to max3100_remove() and use\ntimer_shutdown_sync() to prevent a racing callback from re-arming it.\nAlso free the IRQ and destroy the workqueue there before freeing the\nport. Keep timer_delete_sync() in max3100_shutdown() so that a\nsubsequent open() can re-arm the timer.\n\nThe workqueue is created before request_irq() and destroyed on both\nrequest_irq() failure and normal shutdown. Its presence at remove thus\nidentifies the IRQ left registered when suspend bypasses shutdown.\n\nFree the IRQ before destroying the workqueue, in both\nmax3100_shutdown() and max3100_remove(), and cancel the pending work\nin between. free_irq() waits for a running interrupt handler to\nfinish and no new handler can start afterwards, so a racing handler\ncannot queue work on a workqueue that is being destroyed; the\nforce_end_work check in max3100_dowork() only narrows that window, as\na handler delayed between the check and queue_work() could still run\nafter the teardown has cleared the workqueue pointer. Cancelling the\nwork also keeps destroy_workqueue() from waiting on a queued work item\nin case remove() ever runs while the freezable workqueue is still\nfrozen, e.g. device removal during the resume window, before\nworkqueues are thawed.\n\nThis issue was found by an in-house static analysis tool."
          }
        ],
        "id": "CVE-2026-98749",
        "lastModified": "2026-10-21T13:21:43.030",
        "metrics": {},
        "published": "2026-10-18T16:17:28.660",
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      "current_release_date": "2026-10-20T08:10:51+00:00",
      "cve": "CVE-2026-98749",
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      "product_status:known_affected": "77",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: kernel: Denial of Service via use-after-free in MAX3100 serial driver",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98749.json",
      "version": "3"
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    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-22T16:34:46Z",
      "cve": "CVE-2026-98749",
      "id": "CVE-2026-98749",
      "initial_release_date": "2026-10-22T16:34:46Z",
      "product_status:known_affected": "318",
      "product_status:known_not_affected": "30",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98749",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-98749.json",
      "version": "2"
    }
  }
}



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