{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "baf8532a147d5b76681ce040e2c8f25a3f0e718d"
            },
            {
              "fixed": "b90f33ad9179c69658342323382bfed158f88cb9"
            },
            {
              "fixed": "1c23da6f148089d59b3d3e9b2e7f1eefa927cab9"
            },
            {
              "fixed": "a2f1aa3341f185ca52103dc4908647570b208855"
            },
            {
              "fixed": "c3ab92542475d59ae685cbb294e70ca4d0ba38e9"
            },
            {
              "fixed": "810580cf60edc75c9891c2de3225e4cda78e4d9f"
            },
            {
              "fixed": "f2795c50144d528dabc2cf2fd53c0f0c63a823a1"
            },
            {
              "fixed": "3af81770e2011c6ac7bb597a4af2e4f3591f928c"
            },
            {
              "fixed": "aa0a37b5024d921e96ac4f8f487c8bfbf1f1a582"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.25"
            },
            {
              "fixed": "5.10.273"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.224"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.191"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.160"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.113"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.57"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99039.json"
  },
  "details": "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",
  "modified": "2026-11-01T02:30:50.807276720Z",
  "published": "2026-10-23T12:21:57.421Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1c23da6f148089d59b3d3e9b2e7f1eefa927cab9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3af81770e2011c6ac7bb597a4af2e4f3591f928c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/810580cf60edc75c9891c2de3225e4cda78e4d9f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a2f1aa3341f185ca52103dc4908647570b208855"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aa0a37b5024d921e96ac4f8f487c8bfbf1f1a582"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b90f33ad9179c69658342323382bfed158f88cb9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c3ab92542475d59ae685cbb294e70ca4d0ba38e9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f2795c50144d528dabc2cf2fd53c0f0c63a823a1"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99039.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-99039"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.2",
  "summary": "memstick: core: wait for request completion before freeing card"
}