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FKIE_CVE-2026-80783

Vulnerability from fkie_nvd - Published: 2026-09-04 16:18 - Updated: 2026-09-04 16:18
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: HID: magicmouse: prevent unbounded recursion in magicmouse_raw_event() magicmouse_raw_event() handles DOUBLE_REPORT_ID (0xf7) packets, which pack two touch reports into one, by splitting the packet and calling itself on each half. The only guard against runaway recursion is a "size < 1" check, which stops zero-sized calls but does not bound the recursion depth. A malicious HID device that matches this driver can send a report starting with DOUBLE_REPORT_ID and filled with the sequence [0xf7, 0x00]. Each level consumes two bytes and recurses on the remainder, so an incoming report of up to HID_MAX_BUFFER_SIZE (16 KiB) drives roughly 8000 nested calls. That easily exhausts the 16 KiB kernel stack, leading to a stack overflow: a panic with CONFIG_VMAP_STACK, or memory corruption without it. A double report only ever wraps two normal reports; it is never legitimately nested. Refuse to re-enter the DOUBLE_REPORT_ID case from a recursive call so the recursion depth is bounded to two, while all valid packets keep being parsed exactly as before.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/26c45abed62536aabf4033fb6d64cf72e93374e9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/70589b0c005db003f6d8ae4db3c4d54fed7b83e4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8a10a624996f16628234306b46f0cf36707d78bd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a33a596d3ad8dfe6c96a368097a028abeee16c17
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bec338b07beb883726b32192c8f01c601bc76fda
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d095de37f78c5f32a4252ef0f99b84ba76550b86
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d16df755b4493b6d37803c628b2c621d096796a8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/db8d634128d2ba88d79c0b601e983ebe14bb0519
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/hid/hid-magicmouse.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "26c45abed62536aabf4033fb6d64cf72e93374e9",
              "status": "affected",
              "version": "a462230e16acc8664145216da3c928d03556691a",
              "versionType": "git"
            },
            {
              "lessThan": "8a10a624996f16628234306b46f0cf36707d78bd",
              "status": "affected",
              "version": "a462230e16acc8664145216da3c928d03556691a",
              "versionType": "git"
            },
            {
              "lessThan": "d16df755b4493b6d37803c628b2c621d096796a8",
              "status": "affected",
              "version": "a462230e16acc8664145216da3c928d03556691a",
              "versionType": "git"
            },
            {
              "lessThan": "bec338b07beb883726b32192c8f01c601bc76fda",
              "status": "affected",
              "version": "a462230e16acc8664145216da3c928d03556691a",
              "versionType": "git"
            },
            {
              "lessThan": "70589b0c005db003f6d8ae4db3c4d54fed7b83e4",
              "status": "affected",
              "version": "a462230e16acc8664145216da3c928d03556691a",
              "versionType": "git"
            },
            {
              "lessThan": "a33a596d3ad8dfe6c96a368097a028abeee16c17",
              "status": "affected",
              "version": "a462230e16acc8664145216da3c928d03556691a",
              "versionType": "git"
            },
            {
              "lessThan": "d095de37f78c5f32a4252ef0f99b84ba76550b86",
              "status": "affected",
              "version": "a462230e16acc8664145216da3c928d03556691a",
              "versionType": "git"
            },
            {
              "lessThan": "db8d634128d2ba88d79c0b601e983ebe14bb0519",
              "status": "affected",
              "version": "a462230e16acc8664145216da3c928d03556691a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/hid/hid-magicmouse.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.37"
            },
            {
              "lessThan": "2.6.37",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.220",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.187",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.156",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.108",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.49",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "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\nHID: magicmouse: prevent unbounded recursion in magicmouse_raw_event()\n\nmagicmouse_raw_event() handles DOUBLE_REPORT_ID (0xf7) packets, which pack\ntwo touch reports into one, by splitting the packet and calling itself on\neach half. The only guard against runaway recursion is a \"size \u003c 1\" check,\nwhich stops zero-sized calls but does not bound the recursion depth.\n\nA malicious HID device that matches this driver can send a report starting\nwith DOUBLE_REPORT_ID and filled with the sequence [0xf7, 0x00]. Each level\nconsumes two bytes and recurses on the remainder, so an incoming report of\nup to HID_MAX_BUFFER_SIZE (16 KiB) drives roughly 8000 nested calls. That\neasily exhausts the 16 KiB kernel stack, leading to a stack overflow: a\npanic with CONFIG_VMAP_STACK, or memory corruption without it.\n\nA double report only ever wraps two normal reports; it is never\nlegitimately nested. Refuse to re-enter the DOUBLE_REPORT_ID case from a\nrecursive call so the recursion depth is bounded to two, while all valid\npackets keep being parsed exactly as before."
    }
  ],
  "id": "CVE-2026-80783",
  "lastModified": "2026-09-04T16:18:04.183",
  "metrics": {},
  "published": "2026-09-04T16:18:04.183",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/26c45abed62536aabf4033fb6d64cf72e93374e9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/70589b0c005db003f6d8ae4db3c4d54fed7b83e4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8a10a624996f16628234306b46f0cf36707d78bd"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a33a596d3ad8dfe6c96a368097a028abeee16c17"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/bec338b07beb883726b32192c8f01c601bc76fda"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d095de37f78c5f32a4252ef0f99b84ba76550b86"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d16df755b4493b6d37803c628b2c621d096796a8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/db8d634128d2ba88d79c0b601e983ebe14bb0519"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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