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memstick: core: wait for request completion before freeing card

Type: advisorySource: Official CVE List1 source record

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:

Announced Source revision 1
Original source ↗

CVE-2026-99039

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-99039

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "baf8532a147d5b76681ce040e2c8f25a3f0e718d",
        "lessThan": "c3ab92542475d59ae685cbb294e70ca4d0ba38e9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "baf8532a147d5b76681ce040e2c8f25a3f0e718d",
        "lessThan": "810580cf60edc75c9891c2de3225e4cda78e4d9f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "baf8532a147d5b76681ce040e2c8f25a3f0e718d",
        "lessThan": "f2795c50144d528dabc2cf2fd53c0f0c63a823a1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "baf8532a147d5b76681ce040e2c8f25a3f0e718d",
        "lessThan": "3af81770e2011c6ac7bb597a4af2e4f3591f928c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "baf8532a147d5b76681ce040e2c8f25a3f0e718d",
        "lessThan": "aa0a37b5024d921e96ac4f8f487c8bfbf1f1a582",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/memstick/core/memstick.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.25"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.25",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.113",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.57",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.11",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/memstick/core/memstick.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-99039

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#52871 · Revision 1
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