{"api_version":"1","generated_at":"2026-10-26T07:13:10+00:00","cve":"CVE-2026-93826","urls":{"html":"https://cve.report/CVE-2026-93826","api":"https://cve.report/api/cve/CVE-2026-93826.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-93826","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-93826"},"summary":{"title":"HID: hidpp: fix potential UAF in hidpp_connect_event()","description":"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().","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-24 17:17:16","updated_at":"2026-10-03 11:17:52"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"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","attackVector":"ADJACENT_NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"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"}}],"references":[{"url":"https://git.kernel.org/stable/c/6df6b1f2c49678211f65647c300bc51dda02893b","name":"https://git.kernel.org/stable/c/6df6b1f2c49678211f65647c300bc51dda02893b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3b8b2e58b078cd30e121401535541bb8a6d57133","name":"https://git.kernel.org/stable/c/3b8b2e58b078cd30e121401535541bb8a6d57133","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5d7637f4d050d105177217e64b869f56f9825060","name":"https://git.kernel.org/stable/c/5d7637f4d050d105177217e64b869f56f9825060","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e03fd646adad7f97fa4429ec5f38cee9bde5276e","name":"https://git.kernel.org/stable/c/e03fd646adad7f97fa4429ec5f38cee9bde5276e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3303398cc2aa255ba251650a30024e11d48ea6c3","name":"https://git.kernel.org/stable/c/3303398cc2aa255ba251650a30024e11d48ea6c3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-93826","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93826","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c39e3d5fc9dd3e16c6f59dd94d827540040de66d e03fd646adad7f97fa4429ec5f38cee9bde5276e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c39e3d5fc9dd3e16c6f59dd94d827540040de66d 5d7637f4d050d105177217e64b869f56f9825060 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c39e3d5fc9dd3e16c6f59dd94d827540040de66d 3b8b2e58b078cd30e121401535541bb8a6d57133 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c39e3d5fc9dd3e16c6f59dd94d827540040de66d 3303398cc2aa255ba251650a30024e11d48ea6c3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c39e3d5fc9dd3e16c6f59dd94d827540040de66d 6df6b1f2c49678211f65647c300bc51dda02893b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.19","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 3.19 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.189 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.158 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.111 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.53 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"93826","cve":"CVE-2026-93826","epss":"0.002340000","percentile":"0.130050000","score_date":"2026-10-05","updated_at":"2026-10-06 00:14:18"},"legacy_qids":[]},"source_records":{"cve_program":{"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":[{"lessThan":"e03fd646adad7f97fa4429ec5f38cee9bde5276e","status":"affected","version":"c39e3d5fc9dd3e16c6f59dd94d827540040de66d","versionType":"git"},{"lessThan":"5d7637f4d050d105177217e64b869f56f9825060","status":"affected","version":"c39e3d5fc9dd3e16c6f59dd94d827540040de66d","versionType":"git"},{"lessThan":"3b8b2e58b078cd30e121401535541bb8a6d57133","status":"affected","version":"c39e3d5fc9dd3e16c6f59dd94d827540040de66d","versionType":"git"},{"lessThan":"3303398cc2aa255ba251650a30024e11d48ea6c3","status":"affected","version":"c39e3d5fc9dd3e16c6f59dd94d827540040de66d","versionType":"git"},{"lessThan":"6df6b1f2c49678211f65647c300bc51dda02893b","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->input, 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->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."}]}],"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"},"nvd":{"publishedDate":"2026-09-24 17:17:16","lastModifiedDate":"2026-10-03 11:17:52","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"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","attackVector":"ADJACENT_NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.6,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"93826","Ordinal":"1","Title":"HID: hidpp: fix potential UAF in hidpp_connect_event()","CVE":"CVE-2026-93826","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"93826","Ordinal":"1","NoteData":"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().","Type":"Description","Title":"HID: hidpp: fix potential UAF in hidpp_connect_event()"}]}}}