CVE-2026-93826 (GCVE-0-2026-93826)
Vulnerability from cvelistv5
Published
2026-09-24 16:03
Modified
2026-10-03 10:57
Severity ?
7.5 (High) - CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: HID: hidpp: fix potential UAF in hidpp_connect_event() If input_register_device() fails, we call input_free_device(), but keep stale pointer to the old device in hidpp->input, which could potentially lead to UAF. Fix that by resetting it to NULL before returning from hidpp_connect_event().
References
Impacted products
Vendor Product Version
Linux Linux Version: c39e3d5fc9dd3e16c6f59dd94d827540040de66d
Version: c39e3d5fc9dd3e16c6f59dd94d827540040de66d
Version: c39e3d5fc9dd3e16c6f59dd94d827540040de66d
Version: c39e3d5fc9dd3e16c6f59dd94d827540040de66d
Version: c39e3d5fc9dd3e16c6f59dd94d827540040de66d
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/hid/hid-logitech-hidpp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "versionType": "git"
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              "status": "affected",
              "version": "c39e3d5fc9dd3e16c6f59dd94d827540040de66d",
              "versionType": "git"
            },
            {
              "lessThan": "3b8b2e58b078cd30e121401535541bb8a6d57133",
              "status": "affected",
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              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "c39e3d5fc9dd3e16c6f59dd94d827540040de66d",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "c39e3d5fc9dd3e16c6f59dd94d827540040de66d",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/hid/hid-logitech-hidpp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.19"
            },
            {
              "lessThan": "3.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.189",
                  "versionStartIncluding": "3.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.158",
                  "versionStartIncluding": "3.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.111",
                  "versionStartIncluding": "3.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.53",
                  "versionStartIncluding": "3.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "3.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: hidpp: fix potential UAF in hidpp_connect_event()\n\nIf input_register_device() fails, we call input_free_device(), but keep\nstale pointer to the old device in hidpp-\u003einput, which could potentially\nlead to UAF. Fix that by resetting it to NULL before returning from\nhidpp_connect_event()."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - The UAF is in hidpp_connect_event(), reached from hidpp_probe() and from hidpp_raw_hidpp_event() on a HID++ short report with rap.sub_id 0x41. DELAYED_INIT devices are Unifying DJ children (PIDs 0x4011/0x4101/0x402d via logi_dj_recv_add_djhid_device) and Bluetooth T651, so the trigger arrives over Unifying 2.4 GHz or Bluetooth HIDP.\nAC:H - The dangling hidpp-\u003einput is created only when hidpp_populate_input() stores the new device and input_register_device() then fails, so hidpp_connect_event() calls input_free_device() without clearing the pointer. That register fails on GFP_KERNEL ENOMEM (devres_alloc/input_device_tune_vals), device_add(), or -EINTR on input_mutex, which a HID++ peer cannot induce on demand.\nPR:N - logi_dj_raw_event() delivers Unifying pairing/connect notifications and HID++ reports to the child with no host credential check, and hidpp_probe() binds logitech-hidpp-device during that enumeration; Bluetooth T651 HIDP bind is likewise unauthenticated. No OS account or capability is required.\nUI:N - A REPORT_TYPE_NOTIF_DEVICE_PAIRED/CONNECTED notification (or T651 HIDP connect) runs hidpp_probe() which schedules hidpp_connect_event(); after the failed register, later HID reports handled by wtp_raw_event()/m560_raw_event() dereference hidpp-\u003einput. The attacker\u0027s peripheral generates both without a victim mount, click, or prompt.\nS:U - The freed object is the delayed struct input_dev allocated by hidpp_allocate_input() and stored in hidpp-\u003einput; the UAF stays inside the host kernel HID/input authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - After input_free_device(), wtp_raw_event()/m560_raw_event() still see a non-NULL hidpp-\u003einput and call input_mt_get_slot_by_key()/input_event()/input_sync() on the freed input_dev (vals, absinfo, mt slots). UAF of that heap object is an arbitrary-read primitive once the slab is reused.\nI:H - The same dangling hidpp-\u003einput is used for input_mt_slot(), input_report_key/rel(), and input_sync(), which write event state and walk handlers on the freed input_dev; heap spray of that object yields arbitrary kernel writes and control-flow hijack.\nA:H - Dereferencing the freed input_dev in wtp_touch_event()/m560_raw_event() after hidpp_connect_event()\u0027s input_free_device() oopses or panics when the object is not reused; hidpp_probe() still succeeds, and DJ\u0027s no-op logi_dj_ll_close() keeps delivering reports that retrigger the crash."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-03T10:57:57.986Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e03fd646adad7f97fa4429ec5f38cee9bde5276e"
        },
        {
          "url": "https://git.kernel.org/stable/c/5d7637f4d050d105177217e64b869f56f9825060"
        },
        {
          "url": "https://git.kernel.org/stable/c/3b8b2e58b078cd30e121401535541bb8a6d57133"
        },
        {
          "url": "https://git.kernel.org/stable/c/3303398cc2aa255ba251650a30024e11d48ea6c3"
        },
        {
          "url": "https://git.kernel.org/stable/c/6df6b1f2c49678211f65647c300bc51dda02893b"
        }
      ],
      "title": "HID: hidpp: fix potential UAF in hidpp_connect_event()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93826",
    "datePublished": "2026-09-24T16:03:04.711Z",
    "dateReserved": "2026-09-18T17:59:28.792Z",
    "dateUpdated": "2026-10-03T10:57:57.986Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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