{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2023-52478",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2023-52478",
    "idYear": 2023,
    "status": "PUBLISHED",
    "publishedAt": "2024-02-29T05:43:10.698Z",
    "updatedAt": "2026-08-05T09:10:08.517Z",
    "importedAt": "2026-10-24T01:57:03.413Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "HID: logitech-hidpp: Fix kernel crash on receiver USB disconnect",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: logitech-hidpp: Fix kernel crash on receiver USB disconnect\n\nhidpp_connect_event() has *four* time-of-check vs time-of-use (TOCTOU)\nraces when it races with itself.\n\nhidpp_connect_event() primarily runs from a workqueue but it also runs\non probe() and if a \"device-connected\" packet is received by the hw\nwhen the thread running hidpp_connect_event() from probe() is waiting on\nthe hw, then a second thread running hidpp_connect_event() will be\nstarted from the workqueue.\n\nThis opens the following races (note the below code is simplified):\n\n1. Retrieving + printing the protocol (harmless race):\n\n\tif (!hidpp->protocol_major) {\n\t\thidpp_root_get_protocol_version()\n\t\thidpp->protocol_major = response.rap.params[0];\n\t}\n\nWe can actually see this race hit in the dmesg in the abrt output\nattached to rhbz#2227968:\n\n[ 3064.624215] logitech-hidpp-device 0003:046D:4071.0049: HID++ 4.5 device connected.\n[ 3064.658184] logitech-hidpp-device 0003:046D:4071.0049: HID++ 4.5 device connected.\n\nTesting with extra logging added has shown that after this the 2 threads\ntake turn grabbing the hw access mutex (send_mutex) so they ping-pong\nthrough all the other TOCTOU cases managing to hit all of them:\n\n2. Updating the name to the HIDPP name (harmless race):\n\n\tif (hidpp->name == hdev->name) {\n\t\t...\n\t\thidpp->name = new_name;\n\t}\n\n3. Initializing the power_supply class for the battery (problematic!):\n\nhidpp_initialize_battery()\n{\n        if (hidpp->battery.ps)\n                return 0;\n\n\tprobe_battery(); /* Blocks, threads take turns executing this */\n\n\thidpp->battery.desc.properties =\n\t\tdevm_kmemdup(dev, hidpp_battery_props, cnt, GFP_KERNEL);\n\n\thidpp->battery.ps =\n\t\tdevm_power_supply_register(&hidpp->hid_dev->dev,\n\t\t\t\t\t   &hidpp->battery.desc, cfg);\n}\n\n4. Creating delayed input_device (potentially problematic):\n\n\tif (hidpp->delayed_input)\n\t\treturn;\n\n\thidpp->delayed_input = hidpp_allocate_input(hdev);\n\nThe really big problem here is 3. Hitting the race leads to the following\nsequence:\n\n\thidpp->battery.desc.properties =\n\t\tdevm_kmemdup(dev, hidpp_battery_props, cnt, GFP_KERNEL);\n\n\thidpp->battery.ps =\n\t\tdevm_power_supply_register(&hidpp->hid_dev->dev,\n\t\t\t\t\t   &hidpp->battery.desc, cfg);\n\n\t...\n\n\thidpp->battery.desc.properties =\n\t\tdevm_kmemdup(dev, hidpp_battery_props, cnt, GFP_KERNEL);\n\n\thidpp->battery.ps =\n\t\tdevm_power_supply_register(&hidpp->hid_dev->dev,\n\t\t\t\t\t   &hidpp->battery.desc, cfg);\n\nSo now we have registered 2 power supplies for the same battery,\nwhich looks a bit weird from userspace's pov but this is not even\nthe really big problem.\n\nNotice how:\n\n1. This is all devm-maganaged\n2. The hidpp->battery.desc struct is shared between the 2 power supplies\n3. hidpp->battery.desc.properties points to the result from the second\n   devm_kmemdup()\n\nThis causes a use after free scenario on USB disconnect of the receiver:\n1. The last registered power supply class device gets unregistered\n2. The memory from the last devm_kmemdup() call gets freed,\n   hidpp->battery.desc.properties now points to freed memory\n3. The first registered power supply class device gets unregistered,\n   this involves sending a remove uevent to userspace which invokes\n   power_supply_uevent() to fill the uevent data\n4. power_supply_uevent() uses hidpp->battery.desc.properties which\n   now points to freed memory leading to backtraces like this one:\n\nSep 22 20:01:35 eric kernel: BUG: unable to handle page fault for address: ffffb2140e017f08\n...\nSep 22 20:01:35 eric kernel: Workqueue: usb_hub_wq hub_event\nSep 22 20:01:35 eric kernel: RIP: 0010:power_supply_uevent+0xee/0x1d0\n...\nSep 22 20:01:35 eric kernel:  ? asm_exc_page_fault+0x26/0x30\nSep 22 20:01:35 eric kernel:  ? power_supply_uevent+0xee/0x1d0\nSep 22 20:01:35 eric kernel:  ? power_supply_uevent+0x10d/0x1d0\nSep 22 20:01:35 eric kernel:  dev_uevent+0x10f/0x2d0\nSep 22 20:01:35 eric kernel:  kobject_uevent_env+0x291/0x680\nSep 22 20:01:35 eric kernel:  \n---truncated---",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "c39e3d5fc9dd3e16c6f59dd94d827540040de66d",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ca0c4cc1d215dc22ab0e738c9f017c650f3183f5"
            },
            {
              "version": "c39e3d5fc9dd3e16c6f59dd94d827540040de66d",
              "status": "affected",
              "versionType": "git",
              "lessThan": "44481b244fcaa2b895a53081d6204c574720c38c"
            },
            {
              "version": "c39e3d5fc9dd3e16c6f59dd94d827540040de66d",
              "status": "affected",
              "versionType": "git",
              "lessThan": "cd0e2bf7fb22fe9b989c59c42dca06367fd10e6b"
            },
            {
              "version": "c39e3d5fc9dd3e16c6f59dd94d827540040de66d",
              "status": "affected",
              "versionType": "git",
              "lessThan": "093af62c023537f097d2ebdfaa0bc7c1a6e874e1"
            },
            {
              "version": "c39e3d5fc9dd3e16c6f59dd94d827540040de66d",
              "status": "affected",
              "versionType": "git",
              "lessThan": "28ddc1e0b898291323b62d770b1b931de131a528"
            },
            {
              "version": "c39e3d5fc9dd3e16c6f59dd94d827540040de66d",
              "status": "affected",
              "versionType": "git",
              "lessThan": "fd72ac9556a473fc7daf54efb6ca8a97180d621d"
            },
            {
              "version": "c39e3d5fc9dd3e16c6f59dd94d827540040de66d",
              "status": "affected",
              "versionType": "git",
              "lessThan": "f7b2c7d9831af99369fe8ad9b2a68d78942f414e"
            },
            {
              "version": "c39e3d5fc9dd3e16c6f59dd94d827540040de66d",
              "status": "affected",
              "versionType": "git",
              "lessThan": "dac501397b9d81e4782232c39f94f4307b137452"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "3.19",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "3.19"
            },
            {
              "version": "4.14.328",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.14.*"
            },
            {
              "version": "4.19.297",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.19.*"
            },
            {
              "version": "5.4.259",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "version": "5.10.199",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.136",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.59",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.5.8",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.5.*"
            },
            {
              "version": "6.6",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}