CVE-2026-99038 (GCVE-0-2026-99038)

Vulnerability from cvelistv5 – Published: 2026-10-23 12:21 – Updated: 2026-10-30 12:41
VLAI
Title
memstick: rtsx_usb_ms: complete requests after eject instead of dropping them
Summary
In the Linux kernel, the following vulnerability has been resolved: memstick: rtsx_usb_ms: complete requests after eject instead of dropping them memstick_check() can pass its host->removing check just before rtsx_usb_ms_drv_remove() sets eject/removing. Its next request is then silently dropped: rtsx_usb_ms_request() skips schedule_work() once eject is set, and drv_remove's cancel_work_sync() can also cancel a queued handle_req before it picks the request up. Nobody completes card->mrq_complete. Once memstick core waits for requests without a timeout ("memstick: core: wait for request completion before freeing card"), this hangs removal: memstick_check() never returns and memstick_remove_host() blocks in flush_workqueue(): INFO: task kworker/u10:3:65 blocked for more than 20 seconds. Workqueue: kmemstick memstick_check __wait_for_common memstick_check INFO: task kworker/1:1:33 blocked for more than 20 seconds. Workqueue: usb_hub_wq hub_event __flush_workqueue memstick_remove_host rtsx_usb_ms_drv_remove Never drop a request. rtsx_usb_ms_request() always schedules handle_req, and handle_req fails requests with -ENOMEDIUM once eject is set, without touching the device. drv_remove flushes handle_req instead of cancelling it, and cancels it only after memstick_remove_host(), when no new request can arrive, so it cannot run on a freed host. The host_mutex drain in drv_remove is removed: handle_req always leaves host->req NULL when it finishes, so the drain never had anything to do, and it would now race with handle_req.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 99451dceeb5fdd789f0a2eeb3ee029e80d2ccc40 , < c48245ef696e590e92cbfb622625642bec8dbbad (git)
Affected: 99451dceeb5fdd789f0a2eeb3ee029e80d2ccc40 , < 602a00d75d2ab079c9ab7c0d7b56ae436e604148 (git)
Affected: 99451dceeb5fdd789f0a2eeb3ee029e80d2ccc40 , < 8e4eda6e1b00624820fea1d35508d7422330ee25 (git)
Affected: 99451dceeb5fdd789f0a2eeb3ee029e80d2ccc40 , < f2c181e1d58e911804e14543b2f1cc6b23a0d4d6 (git)
Affected: 99451dceeb5fdd789f0a2eeb3ee029e80d2ccc40 , < 5b599e28aeb3684772aef64f46cc6f25f4c67128 (git)
Affected: 99451dceeb5fdd789f0a2eeb3ee029e80d2ccc40 , < d7e811c3a49cd5cff529c157df886719e09370ec (git)
Affected: 99451dceeb5fdd789f0a2eeb3ee029e80d2ccc40 , < 5616da0f92339328fa1472876df51555e15ad340 (git)
Affected: 99451dceeb5fdd789f0a2eeb3ee029e80d2ccc40 , < c96ca94425b076dc398d929366e378d1e22ec794 (git)
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Linux Linux Affected: 3.16
Unaffected: 0 , < 3.16 (semver)
Unaffected: 5.10.273 , ≤ 5.10.* (semver)
Unaffected: 5.15.224 , ≤ 5.15.* (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.113 , ≤ 6.12.* (semver)
Unaffected: 6.18.57 , ≤ 6.18.* (semver)
Unaffected: 7.2.11 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
            "drivers/memstick/host/rtsx_usb_ms.c"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmemstick: rtsx_usb_ms: complete requests after eject instead of dropping them\n\nmemstick_check() can pass its host-\u003eremoving check just before\nrtsx_usb_ms_drv_remove() sets eject/removing. Its next request is then\nsilently dropped: rtsx_usb_ms_request() skips schedule_work() once eject\nis set, and drv_remove\u0027s cancel_work_sync() can also cancel a queued\nhandle_req before it picks the request up. Nobody completes\ncard-\u003emrq_complete.\n\nOnce memstick core waits for requests without a timeout (\"memstick: core:\nwait for request completion before freeing card\"), this hangs removal:\nmemstick_check() never returns and memstick_remove_host() blocks in\nflush_workqueue():\n\n  INFO: task kworker/u10:3:65 blocked for more than 20 seconds.\n  Workqueue: kmemstick memstick_check\n   __wait_for_common\n   memstick_check\n\n  INFO: task kworker/1:1:33 blocked for more than 20 seconds.\n  Workqueue: usb_hub_wq hub_event\n   __flush_workqueue\n   memstick_remove_host\n   rtsx_usb_ms_drv_remove\n\nNever drop a request. rtsx_usb_ms_request() always schedules handle_req,\nand handle_req fails requests with -ENOMEDIUM once eject is set, without\ntouching the device. drv_remove flushes handle_req instead of cancelling\nit, and cancels it only after memstick_remove_host(), when no new\nrequest can arrive, so it cannot run on a freed host.\n\nThe host_mutex drain in drv_remove is removed: handle_req always leaves\nhost-\u003ereq NULL when it finishes, so the drain never had anything to do,\nand it would now race with handle_req."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:41:11.555Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/602a00d75d2ab079c9ab7c0d7b56ae436e604148"
        },
        {
          "url": "https://git.kernel.org/stable/c/8e4eda6e1b00624820fea1d35508d7422330ee25"
        },
        {
          "url": "https://git.kernel.org/stable/c/f2c181e1d58e911804e14543b2f1cc6b23a0d4d6"
        },
        {
          "url": "https://git.kernel.org/stable/c/5b599e28aeb3684772aef64f46cc6f25f4c67128"
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        {
          "url": "https://git.kernel.org/stable/c/d7e811c3a49cd5cff529c157df886719e09370ec"
        },
        {
          "url": "https://git.kernel.org/stable/c/5616da0f92339328fa1472876df51555e15ad340"
        },
        {
          "url": "https://git.kernel.org/stable/c/c96ca94425b076dc398d929366e378d1e22ec794"
        }
      ],
      "title": "memstick: rtsx_usb_ms: complete requests after eject instead of dropping them",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-99038",
    "datePublished": "2026-10-23T12:21:56.333Z",
    "dateReserved": "2026-09-25T10:25:14.387Z",
    "dateUpdated": "2026-10-30T12:41:11.555Z",
    "state": "PUBLISHED"
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      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "product_status:known_not_affected": "1",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "memstick: rtsx_usb_ms: complete requests after eject instead of dropping them",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-99038.json",
      "version": "5"
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmemstick: rtsx_usb_ms: complete requests after eject instead of dropping them\n\nmemstick_check() can pass its host-\u003eremoving check just before\nrtsx_usb_ms_drv_remove() sets eject/removing. Its next request is then\nsilently dropped: rtsx_usb_ms_request() skips schedule_work() once eject\nis set, and drv_remove\u0027s cancel_work_sync() can also cancel a queued\nhandle_req before it picks the request up. Nobody completes\ncard-\u003emrq_complete.\n\nOnce memstick core waits for requests without a timeout (\"memstick: core:\nwait for request completion before freeing card\"), this hangs removal:\nmemstick_check() never returns and memstick_remove_host() blocks in\nflush_workqueue():\n\n  INFO: task kworker/u10:3:65 blocked for more than 20 seconds.\n  Workqueue: kmemstick memstick_check\n   __wait_for_common\n   memstick_check\n\n  INFO: task kworker/1:1:33 blocked for more than 20 seconds.\n  Workqueue: usb_hub_wq hub_event\n   __flush_workqueue\n   memstick_remove_host\n   rtsx_usb_ms_drv_remove\n\nNever drop a request. rtsx_usb_ms_request() always schedules handle_req,\nand handle_req fails requests with -ENOMEDIUM once eject is set, without\ntouching the device. drv_remove flushes handle_req instead of cancelling\nit, and cancels it only after memstick_remove_host(), when no new\nrequest can arrive, so it cannot run on a freed host.\n\nThe host_mutex drain in drv_remove is removed: handle_req always leaves\nhost-\u003ereq NULL when it finishes, so the drain never had anything to do,\nand it would now race with handle_req."
          }
        ],
        "id": "CVE-2026-99038",
        "lastModified": "2026-10-30T13:21:40.917",
        "metrics": {},
        "published": "2026-10-23T13:17:27.067",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/5616da0f92339328fa1472876df51555e15ad340"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/5b599e28aeb3684772aef64f46cc6f25f4c67128"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/602a00d75d2ab079c9ab7c0d7b56ae436e604148"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/8e4eda6e1b00624820fea1d35508d7422330ee25"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c48245ef696e590e92cbfb622625642bec8dbbad"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c96ca94425b076dc398d929366e378d1e22ec794"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/d7e811c3a49cd5cff529c157df886719e09370ec"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f2c181e1d58e911804e14543b2f1cc6b23a0d4d6"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-06T03:21:41+00:00",
      "cve": "CVE-2026-99038",
      "id": "CVE-2026-99038",
      "initial_release_date": "2026-10-23T00:00:00+00:00",
      "product_status:known_affected": "161",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: memstick: rtsx_usb_ms: complete requests after eject instead of dropping them",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-99038.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-11-12T00:42:21Z",
      "cve": "CVE-2026-99038",
      "id": "CVE-2026-99038",
      "initial_release_date": "2026-10-23T23:51:31Z",
      "product_status:known_affected": "522",
      "product_status:known_not_affected": "210",
      "product_status:recommended": "84",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-99038",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-99038.json",
      "version": "9"
    }
  }
}



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Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.