GHSA-7HW4-87PJ-MC7H

Vulnerability from github – Published: 2026-10-18 18:32 – Updated: 2026-10-30 15:34
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

usb: storage: sierra_ms: reject short SWoC info transfers

sierra_get_swoc_info() requests sizeof(struct swoc_info) (60) bytes from the device via usb_control_msg(), but its callers only treat a negative return value as failure. A device that answers the vendor-specific GetSwocInfo request with a short IN transfer is therefore accepted, leaving the tail of the freshly allocated (kmalloc(), non-zeroing) swoc_info buffer uninitialized.

truinst_show() subsequently prints swocInfo->rev, swocInfo->LinuxSKU and swocInfo->LinuxVer from that buffer into the world-readable (0444) "truinst" sysfs attribute. An emulated/malicious USB device (VID 0x1199, PID 0x0fff) can exploit this to disclose up to 5 bytes of stale kernel heap memory (kmalloc-64) to unprivileged userspace, once per sysfs read, indefinitely. On kernels built without init_on_alloc this leaks recently freed heap contents.

Only accept the transfer when the full structure was received. sierra_ms_init() already retries failed queries, so well-behaved devices are unaffected.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98771"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-18T16:17:31Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: storage: sierra_ms: reject short SWoC info transfers\n\nsierra_get_swoc_info() requests sizeof(struct swoc_info) (60) bytes\nfrom the device via usb_control_msg(), but its callers only treat a\nnegative return value as failure. A device that answers the\nvendor-specific GetSwocInfo request with a short IN transfer is\ntherefore accepted, leaving the tail of the freshly allocated\n(kmalloc(), non-zeroing) swoc_info buffer uninitialized.\n\ntruinst_show() subsequently prints swocInfo-\u003erev, swocInfo-\u003eLinuxSKU\nand swocInfo-\u003eLinuxVer from that buffer into the world-readable\n(0444) \"truinst\" sysfs attribute. An emulated/malicious USB device\n(VID 0x1199, PID 0x0fff) can exploit this to disclose up to 5 bytes\nof stale kernel heap memory (kmalloc-64) to unprivileged userspace,\nonce per sysfs read, indefinitely. On kernels built without\ninit_on_alloc this leaks recently freed heap contents.\n\nOnly accept the transfer when the full structure was received.\nsierra_ms_init() already retries failed queries, so well-behaved\ndevices are unaffected.",
  "id": "GHSA-7hw4-87pj-mc7h",
  "modified": "2026-10-30T15:34:00Z",
  "published": "2026-10-18T18:32:02Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98771"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/353ca2623104a3baf5642c3ea31569df04ce4aaf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/411da2ec8c62bfa39407e5a20d659b973b3cf311"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4faaad69f18332246bbd4ca41718beb2a305bb72"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/799810166646bcf9dc5a4e77bc4b0bdf6bc443f2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8a0200d14acd9db388b85cd016e68a4e60d900ec"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c85e8331d298b8f1dee8fe63718e76435cec7133"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/db9d3be156baca6ef80ae5d93acfeb85c61a74dd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e2d62928f2666a2964a23b1d39e6e762f0628d7b"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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