FKIE_CVE-2026-98771

Vulnerability from fkie_nvd - Published: 2026-10-18 16:17 - Updated: 2026-10-30 13:21
Severity
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/353ca2623104a3baf5642c3ea31569df04ce4aaf
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/411da2ec8c62bfa39407e5a20d659b973b3cf311
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4faaad69f18332246bbd4ca41718beb2a305bb72
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/799810166646bcf9dc5a4e77bc4b0bdf6bc443f2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8a0200d14acd9db388b85cd016e68a4e60d900ec
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c85e8331d298b8f1dee8fe63718e76435cec7133
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/db9d3be156baca6ef80ae5d93acfeb85c61a74dd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e2d62928f2666a2964a23b1d39e6e762f0628d7b
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/storage/sierra_ms.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "353ca2623104a3baf5642c3ea31569df04ce4aaf",
              "status": "affected",
              "version": "32fe5e393455d87db4988af03915634304870fb4",
              "versionType": "git"
            },
            {
              "lessThan": "799810166646bcf9dc5a4e77bc4b0bdf6bc443f2",
              "status": "affected",
              "version": "32fe5e393455d87db4988af03915634304870fb4",
              "versionType": "git"
            },
            {
              "lessThan": "411da2ec8c62bfa39407e5a20d659b973b3cf311",
              "status": "affected",
              "version": "32fe5e393455d87db4988af03915634304870fb4",
              "versionType": "git"
            },
            {
              "lessThan": "4faaad69f18332246bbd4ca41718beb2a305bb72",
              "status": "affected",
              "version": "32fe5e393455d87db4988af03915634304870fb4",
              "versionType": "git"
            },
            {
              "lessThan": "c85e8331d298b8f1dee8fe63718e76435cec7133",
              "status": "affected",
              "version": "32fe5e393455d87db4988af03915634304870fb4",
              "versionType": "git"
            },
            {
              "lessThan": "e2d62928f2666a2964a23b1d39e6e762f0628d7b",
              "status": "affected",
              "version": "32fe5e393455d87db4988af03915634304870fb4",
              "versionType": "git"
            },
            {
              "lessThan": "db9d3be156baca6ef80ae5d93acfeb85c61a74dd",
              "status": "affected",
              "version": "32fe5e393455d87db4988af03915634304870fb4",
              "versionType": "git"
            },
            {
              "lessThan": "8a0200d14acd9db388b85cd016e68a4e60d900ec",
              "status": "affected",
              "version": "32fe5e393455d87db4988af03915634304870fb4",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/storage/sierra_ms.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.27"
            },
            {
              "lessThan": "2.6.27",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.273",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.224",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.191",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.113",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.56",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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": "CVE-2026-98771",
  "lastModified": "2026-10-30T13:21:26.747",
  "metrics": {},
  "published": "2026-10-18T16:17:31.020",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/353ca2623104a3baf5642c3ea31569df04ce4aaf"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/411da2ec8c62bfa39407e5a20d659b973b3cf311"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4faaad69f18332246bbd4ca41718beb2a305bb72"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/799810166646bcf9dc5a4e77bc4b0bdf6bc443f2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8a0200d14acd9db388b85cd016e68a4e60d900ec"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c85e8331d298b8f1dee8fe63718e76435cec7133"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/db9d3be156baca6ef80ae5d93acfeb85c61a74dd"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e2d62928f2666a2964a23b1d39e6e762f0628d7b"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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