{"api_version":"1","generated_at":"2026-08-27T14:57:57+00:00","cve":"CVE-2026-80572","urls":{"html":"https://cve.report/CVE-2026-80572","api":"https://cve.report/api/cve/CVE-2026-80572.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-80572","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-80572"},"summary":{"title":"Input: byd - synchronize timer deletion before freeing private data","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nInput: byd - synchronize timer deletion before freeing private data\n\nbyd_disconnect() uses timer_delete() before freeing the driver's private\ndata.  This does not wait for a running byd_clear_touch() callback, which\ndereferences the private data and its psmouse pointer.  A callback racing\nwith disconnect can therefore access the private data after it has been\nfreed.  The timer can also still be re-armed by byd_process_byte() while\nthe disconnect is in progress.\n\nUse timer_shutdown_sync() before freeing the private data: it waits for\na running callback and turns any later re-arm attempt into a no-op.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-26 15:17:13","updated_at":"2026-08-27 13:18:40"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/84b205297fa15f97510342221d8c9a0119711478","name":"https://git.kernel.org/stable/c/84b205297fa15f97510342221d8c9a0119711478","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c83e79c0842ed29860648bcce5022ef0ba5001c6","name":"https://git.kernel.org/stable/c/c83e79c0842ed29860648bcce5022ef0ba5001c6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2e509ef60ee41a2da0deb062c262bb530143fb37","name":"https://git.kernel.org/stable/c/2e509ef60ee41a2da0deb062c262bb530143fb37","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/28d984a66b9e14be74986167b6ad40b5e0daf19a","name":"https://git.kernel.org/stable/c/28d984a66b9e14be74986167b6ad40b5e0daf19a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8dbfd8e32a13e116790780ed0be82b5a05eb9916","name":"https://git.kernel.org/stable/c/8dbfd8e32a13e116790780ed0be82b5a05eb9916","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ee944a706a18322b4a2599eebe8040a2994e928f","name":"https://git.kernel.org/stable/c/ee944a706a18322b4a2599eebe8040a2994e928f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80572","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80572","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2d5f5611dd0de52e9a52b56391a7049a52184e72 84b205297fa15f97510342221d8c9a0119711478 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2d5f5611dd0de52e9a52b56391a7049a52184e72 28d984a66b9e14be74986167b6ad40b5e0daf19a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2d5f5611dd0de52e9a52b56391a7049a52184e72 ee944a706a18322b4a2599eebe8040a2994e928f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2d5f5611dd0de52e9a52b56391a7049a52184e72 8dbfd8e32a13e116790780ed0be82b5a05eb9916 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2d5f5611dd0de52e9a52b56391a7049a52184e72 2e509ef60ee41a2da0deb062c262bb530143fb37 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2d5f5611dd0de52e9a52b56391a7049a52184e72 c83e79c0842ed29860648bcce5022ef0ba5001c6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.6","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.6 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.185 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.154 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.106 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.46 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.10 7.1.* 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":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/input/mouse/byd.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"84b205297fa15f97510342221d8c9a0119711478","status":"affected","version":"2d5f5611dd0de52e9a52b56391a7049a52184e72","versionType":"git"},{"lessThan":"28d984a66b9e14be74986167b6ad40b5e0daf19a","status":"affected","version":"2d5f5611dd0de52e9a52b56391a7049a52184e72","versionType":"git"},{"lessThan":"ee944a706a18322b4a2599eebe8040a2994e928f","status":"affected","version":"2d5f5611dd0de52e9a52b56391a7049a52184e72","versionType":"git"},{"lessThan":"8dbfd8e32a13e116790780ed0be82b5a05eb9916","status":"affected","version":"2d5f5611dd0de52e9a52b56391a7049a52184e72","versionType":"git"},{"lessThan":"2e509ef60ee41a2da0deb062c262bb530143fb37","status":"affected","version":"2d5f5611dd0de52e9a52b56391a7049a52184e72","versionType":"git"},{"lessThan":"c83e79c0842ed29860648bcce5022ef0ba5001c6","status":"affected","version":"2d5f5611dd0de52e9a52b56391a7049a52184e72","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/input/mouse/byd.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.6"},{"lessThan":"4.6","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.185","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.154","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.106","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.46","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.10","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":"6.1.185","versionStartIncluding":"4.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.154","versionStartIncluding":"4.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.106","versionStartIncluding":"4.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.46","versionStartIncluding":"4.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.10","versionStartIncluding":"4.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"4.6","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nInput: byd - synchronize timer deletion before freeing private data\n\nbyd_disconnect() uses timer_delete() before freeing the driver's private\ndata.  This does not wait for a running byd_clear_touch() callback, which\ndereferences the private data and its psmouse pointer.  A callback racing\nwith disconnect can therefore access the private data after it has been\nfreed.  The timer can also still be re-armed by byd_process_byte() while\nthe disconnect is in progress.\n\nUse timer_shutdown_sync() before freeing the private data: it waits for\na running callback and turns any later re-arm attempt into a no-op."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:L - Reachable from local PS/2 input: BYD packets enter via serio_interrupt() from built-in touchpad hardware or userio-emulated SERIO_8042 port; byd_process_byte()/byd_disconnect() are not network-exposed.\nAC:L - An attacker can arm the 64ms byd_clear_touch timer via touch/relative packets while concurrently closing userio or unbinding the port to invoke byd_disconnect(), controlling both sides of the disconnect/timer race.\nPR:L - Exploitation needs only local access to the PS/2 touchpad or /dev/userio to inject packets and trigger teardown; no init-namespace root, CAP_SYS_ADMIN, or write access to psmouse sysfs is required.\nUI:N - The attacker supplies touchpad traffic and drives device disconnect/emulation teardown themselves; no separate victim interaction (mount, plug-in approval, or click) is needed.\nS:U - Corruption stays within the host kernel address space during PS/2 driver teardown; it is standard local privilege escalation, not a guest-to-host or sandbox boundary crossing.\nC:H - byd_clear_touch() dereferences freed byd_data (priv->psmouse) and can read attacker-reclaimed slab contents, enabling kernel pointer disclosure and broader arbitrary read primitives typical of heap use-after-free bugs.\nI:H - The timer callback writes into freed byd_data fields and may call input/report helpers through a stale psmouse pointer, giving heap corruption and a path to arbitrary kernel writes or control-flow hijacking.\nA:H - Racing the timer with disconnect can cause invalid pointer dereferences, use-after-free access, kernel oops, or panic during input teardown; the condition is repeatable by re-arming the timer."}]}],"providerMetadata":{"dateUpdated":"2026-08-27T12:40:19.284Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/84b205297fa15f97510342221d8c9a0119711478"},{"url":"https://git.kernel.org/stable/c/28d984a66b9e14be74986167b6ad40b5e0daf19a"},{"url":"https://git.kernel.org/stable/c/ee944a706a18322b4a2599eebe8040a2994e928f"},{"url":"https://git.kernel.org/stable/c/8dbfd8e32a13e116790780ed0be82b5a05eb9916"},{"url":"https://git.kernel.org/stable/c/2e509ef60ee41a2da0deb062c262bb530143fb37"},{"url":"https://git.kernel.org/stable/c/c83e79c0842ed29860648bcce5022ef0ba5001c6"}],"title":"Input: byd - synchronize timer deletion before freeing private data","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-80572","datePublished":"2026-08-26T14:37:33.141Z","dateReserved":"2026-08-26T14:34:25.768Z","dateUpdated":"2026-08-27T12:40:19.284Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-26 15:17:13","lastModifiedDate":"2026-08-27 13:18:40","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"80572","Ordinal":"1","Title":"Input: byd - synchronize timer deletion before freeing private d","CVE":"CVE-2026-80572","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"80572","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nInput: byd - synchronize timer deletion before freeing private data\n\nbyd_disconnect() uses timer_delete() before freeing the driver's private\ndata.  This does not wait for a running byd_clear_touch() callback, which\ndereferences the private data and its psmouse pointer.  A callback racing\nwith disconnect can therefore access the private data after it has been\nfreed.  The timer can also still be re-armed by byd_process_byte() while\nthe disconnect is in progress.\n\nUse timer_shutdown_sync() before freeing the private data: it waits for\na running callback and turns any later re-arm attempt into a no-op.","Type":"Description","Title":"Input: byd - synchronize timer deletion before freeing private d"}]}}}