{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-93826", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-18T17:59:28.792Z", "datePublished": "2026-09-24T16:03:04.711Z", "dateUpdated": "2026-10-03T10:57:57.986Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-03T10:57:57.986Z" }, "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->input, which could potentially\nlead to UAF. Fix that by resetting it to NULL before returning from\nhidpp_connect_event()." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "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->input 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->input. The attacker's 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->input; 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->input 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->input 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()'s input_free_device() oopses or panics when the object is not reused; hidpp_probe() still succeeds, and DJ's no-op logi_dj_ll_close() keeps delivering reports that retrigger the crash." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/hid/hid-logitech-hidpp.c" ], "versions": [ { "version": "c39e3d5fc9dd3e16c6f59dd94d827540040de66d", "lessThan": "e03fd646adad7f97fa4429ec5f38cee9bde5276e", "status": "affected", "versionType": "git" }, { "version": "c39e3d5fc9dd3e16c6f59dd94d827540040de66d", "lessThan": "5d7637f4d050d105177217e64b869f56f9825060", "status": "affected", "versionType": "git" }, { "version": "c39e3d5fc9dd3e16c6f59dd94d827540040de66d", "lessThan": "3b8b2e58b078cd30e121401535541bb8a6d57133", "status": "affected", "versionType": "git" }, { "version": "c39e3d5fc9dd3e16c6f59dd94d827540040de66d", "lessThan": "3303398cc2aa255ba251650a30024e11d48ea6c3", "status": "affected", "versionType": "git" }, { "version": "c39e3d5fc9dd3e16c6f59dd94d827540040de66d", "lessThan": "6df6b1f2c49678211f65647c300bc51dda02893b", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/hid/hid-logitech-hidpp.c" ], "versions": [ { "version": "3.19", "status": "affected" }, { "version": "0", "lessThan": "3.19", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.189", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.111", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.53", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.1.189" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.6.158" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.12.111" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.18.53" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "7.2" } ] } ] } ], "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" } } } }