CVE-2026-99039 (GCVE-0-2026-99039)

Vulnerability from cvelistv5 – Published: 2026-10-23 12:21 – Updated: 2026-10-23 12:21
VLAI
Title
memstick: core: wait for request completion before freeing card
Summary
In the Linux kernel, the following vulnerability has been resolved: memstick: core: wait for request completion before freeing card In memstick_alloc_card() and memstick_set_rw_addr(), wait_for_completion_timeout() is used to wait for device identification and address configuration requests to complete. The memstick subsystem does not provide an abort or cancellation callback in struct memstick_host for in-flight requests. If wait_for_completion_timeout() expires (for instance, when a USB transfer or command retry is delayed), memstick_alloc_card() returns an error and frees the memstick_dev structure via kfree(card). However, the host controller driver (such as rtsx_usb_ms) is still running the request asynchronously in worker context. When the transfer eventually finishes, the driver writes into host->req->data, which points to memory inside the already freed card structure. This leads to a KASAN slab-use-after-free write: BUG: KASAN: slab-use-after-free in ms_read_bytes+0x8fe/0x990 Write of size 1 at addr ffff88813c188079 by task kworker/1:5/5239 Workqueue: events rtsx_usb_ms_handle_req Call Trace: ms_read_bytes+0x8fe/0x990 drivers/memstick/host/rtsx_usb_ms.c:450 rtsx_usb_ms_issue_cmd drivers/memstick/host/rtsx_usb_ms.c:477 [inline] rtsx_usb_ms_handle_req+0x557/0x1a00 drivers/memstick/host/rtsx_usb_ms.c:531 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560 kthread+0x373/0x450 kernel/kthread.c:436 Allocated by task 1662: memstick_alloc_card drivers/memstick/core/memstick.c:383 [inline] memstick_check+0x2c1/0x10d0 drivers/memstick/core/memstick.c:452 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396 Freed by task 1662: kfree+0x20c/0x650 mm/slub.c:6792 memstick_alloc_card drivers/memstick/core/memstick.c:420 [inline] memstick_check+0x72b/0x10d0 drivers/memstick/core/memstick.c:452 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396 Host controller drivers (rtsx_usb_ms, jmb38x_ms, tifm_ms, r592) already implement their own hardware and bus timeouts, and callers in mspro_block and ms_block already rely on wait_for_completion() unconditionally. Replace wait_for_completion_timeout() with wait_for_completion() in memstick_set_rw_addr() and memstick_alloc_card() so that the card structure is never freed while an asynchronous request is in flight.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7056 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: baf8532a147d5b76681ce040e2c8f25a3f0e718d , < c3ab92542475d59ae685cbb294e70ca4d0ba38e9 (git)
Affected: baf8532a147d5b76681ce040e2c8f25a3f0e718d , < 810580cf60edc75c9891c2de3225e4cda78e4d9f (git)
Affected: baf8532a147d5b76681ce040e2c8f25a3f0e718d , < f2795c50144d528dabc2cf2fd53c0f0c63a823a1 (git)
Affected: baf8532a147d5b76681ce040e2c8f25a3f0e718d , < 3af81770e2011c6ac7bb597a4af2e4f3591f928c (git)
Affected: baf8532a147d5b76681ce040e2c8f25a3f0e718d , < aa0a37b5024d921e96ac4f8f487c8bfbf1f1a582 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.25
Unaffected: 0 , < 2.6.25 (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)
guessed Create a notification for this product.
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{
  "containers": {
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          "programFiles": [
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      "cpeApplicability": [
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmemstick: core: wait for request completion before freeing card\n\nIn memstick_alloc_card() and memstick_set_rw_addr(),\nwait_for_completion_timeout() is used to wait for device identification\nand address configuration requests to complete.\n\nThe memstick subsystem does not provide an abort or cancellation\ncallback in struct memstick_host for in-flight requests. If\nwait_for_completion_timeout() expires (for instance, when a USB transfer\nor command retry is delayed), memstick_alloc_card() returns an error and\nfrees the memstick_dev structure via kfree(card).\n\nHowever, the host controller driver (such as rtsx_usb_ms) is still\nrunning the request asynchronously in worker context. When the transfer\neventually finishes, the driver writes into host-\u003ereq-\u003edata, which\npoints to memory inside the already freed card structure. This leads to\na KASAN slab-use-after-free write:\n\n  BUG: KASAN: slab-use-after-free in ms_read_bytes+0x8fe/0x990\n  Write of size 1 at addr ffff88813c188079 by task kworker/1:5/5239\n  Workqueue: events rtsx_usb_ms_handle_req\n  Call Trace:\n   ms_read_bytes+0x8fe/0x990 drivers/memstick/host/rtsx_usb_ms.c:450\n   rtsx_usb_ms_issue_cmd drivers/memstick/host/rtsx_usb_ms.c:477 [inline]\n   rtsx_usb_ms_handle_req+0x557/0x1a00 drivers/memstick/host/rtsx_usb_ms.c:531\n   process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396\n   worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560\n   kthread+0x373/0x450 kernel/kthread.c:436\n\n  Allocated by task 1662:\n   memstick_alloc_card drivers/memstick/core/memstick.c:383 [inline]\n   memstick_check+0x2c1/0x10d0 drivers/memstick/core/memstick.c:452\n   process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396\n\n  Freed by task 1662:\n   kfree+0x20c/0x650 mm/slub.c:6792\n   memstick_alloc_card drivers/memstick/core/memstick.c:420 [inline]\n   memstick_check+0x72b/0x10d0 drivers/memstick/core/memstick.c:452\n   process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396\n\nHost controller drivers (rtsx_usb_ms, jmb38x_ms, tifm_ms, r592) already\nimplement their own hardware and bus timeouts, and callers in\nmspro_block and ms_block already rely on wait_for_completion()\nunconditionally.\n\nReplace wait_for_completion_timeout() with wait_for_completion() in\nmemstick_set_rw_addr() and memstick_alloc_card() so that the card\nstructure is never freed while an asynchronous request is in flight."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-23T12:21:57.421Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/aa0a37b5024d921e96ac4f8f487c8bfbf1f1a582"
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      "title": "memstick: core: wait for request completion before freeing card",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-99039",
    "datePublished": "2026-10-23T12:21:57.421Z",
    "dateReserved": "2026-09-25T10:25:14.387Z",
    "dateUpdated": "2026-10-23T12:21:57.421Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-99039",
      "date": "2026-10-25",
      "epss": "0.00168",
      "percentile": "0.06163"
    },
    "microsoft_vex": {
      "current_release_date": "2026-10-25T01:05:20.000Z",
      "cve": "CVE-2026-99039",
      "id": "msrc_CVE-2026-99039",
      "initial_release_date": "2026-10-25T01:04:18.000Z",
      "product_status:under_investigation": "2",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "memstick: core: wait for request completion before freeing card",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-99039.json",
      "version": "2"
    },
    "nvd": {
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        "affected": [
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                "product": "Linux",
                "programFiles": [
                  "drivers/memstick/core/memstick.c"
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                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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                "versions": [
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmemstick: core: wait for request completion before freeing card\n\nIn memstick_alloc_card() and memstick_set_rw_addr(),\nwait_for_completion_timeout() is used to wait for device identification\nand address configuration requests to complete.\n\nThe memstick subsystem does not provide an abort or cancellation\ncallback in struct memstick_host for in-flight requests. If\nwait_for_completion_timeout() expires (for instance, when a USB transfer\nor command retry is delayed), memstick_alloc_card() returns an error and\nfrees the memstick_dev structure via kfree(card).\n\nHowever, the host controller driver (such as rtsx_usb_ms) is still\nrunning the request asynchronously in worker context. When the transfer\neventually finishes, the driver writes into host-\u003ereq-\u003edata, which\npoints to memory inside the already freed card structure. This leads to\na KASAN slab-use-after-free write:\n\n  BUG: KASAN: slab-use-after-free in ms_read_bytes+0x8fe/0x990\n  Write of size 1 at addr ffff88813c188079 by task kworker/1:5/5239\n  Workqueue: events rtsx_usb_ms_handle_req\n  Call Trace:\n   ms_read_bytes+0x8fe/0x990 drivers/memstick/host/rtsx_usb_ms.c:450\n   rtsx_usb_ms_issue_cmd drivers/memstick/host/rtsx_usb_ms.c:477 [inline]\n   rtsx_usb_ms_handle_req+0x557/0x1a00 drivers/memstick/host/rtsx_usb_ms.c:531\n   process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396\n   worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560\n   kthread+0x373/0x450 kernel/kthread.c:436\n\n  Allocated by task 1662:\n   memstick_alloc_card drivers/memstick/core/memstick.c:383 [inline]\n   memstick_check+0x2c1/0x10d0 drivers/memstick/core/memstick.c:452\n   process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396\n\n  Freed by task 1662:\n   kfree+0x20c/0x650 mm/slub.c:6792\n   memstick_alloc_card drivers/memstick/core/memstick.c:420 [inline]\n   memstick_check+0x72b/0x10d0 drivers/memstick/core/memstick.c:452\n   process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396\n\nHost controller drivers (rtsx_usb_ms, jmb38x_ms, tifm_ms, r592) already\nimplement their own hardware and bus timeouts, and callers in\nmspro_block and ms_block already rely on wait_for_completion()\nunconditionally.\n\nReplace wait_for_completion_timeout() with wait_for_completion() in\nmemstick_set_rw_addr() and memstick_alloc_card() so that the card\nstructure is never freed while an asynchronous request is in flight."
          }
        ],
        "id": "CVE-2026-99039",
        "lastModified": "2026-10-23T13:17:27.223",
        "metrics": {},
        "published": "2026-10-23T13:17:27.223",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/3af81770e2011c6ac7bb597a4af2e4f3591f928c"
          },
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/810580cf60edc75c9891c2de3225e4cda78e4d9f"
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            "url": "https://git.kernel.org/stable/c/aa0a37b5024d921e96ac4f8f487c8bfbf1f1a582"
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c3ab92542475d59ae685cbb294e70ca4d0ba38e9"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f2795c50144d528dabc2cf2fd53c0f0c63a823a1"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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