{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-80572", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.768Z", "datePublished": "2026-08-26T14:37:33.141Z", "dateUpdated": "2026-10-16T19:26:27.388Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-27T12:40:19.284Z" }, "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": { "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" }, "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/input/mouse/byd.c" ], "versions": [ { "version": "2d5f5611dd0de52e9a52b56391a7049a52184e72", "lessThan": "84b205297fa15f97510342221d8c9a0119711478", "status": "affected", "versionType": "git" }, { "version": "2d5f5611dd0de52e9a52b56391a7049a52184e72", "lessThan": "28d984a66b9e14be74986167b6ad40b5e0daf19a", "status": "affected", "versionType": "git" }, { "version": "2d5f5611dd0de52e9a52b56391a7049a52184e72", "lessThan": "ee944a706a18322b4a2599eebe8040a2994e928f", "status": "affected", "versionType": "git" }, { "version": "2d5f5611dd0de52e9a52b56391a7049a52184e72", "lessThan": "8dbfd8e32a13e116790780ed0be82b5a05eb9916", "status": "affected", "versionType": "git" }, { "version": "2d5f5611dd0de52e9a52b56391a7049a52184e72", "lessThan": "2e509ef60ee41a2da0deb062c262bb530143fb37", "status": "affected", "versionType": "git" }, { "version": "2d5f5611dd0de52e9a52b56391a7049a52184e72", "lessThan": "c83e79c0842ed29860648bcce5022ef0ba5001c6", "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/input/mouse/byd.c" ], "versions": [ { "version": "4.6", "status": "affected" }, { "version": "0", "lessThan": "4.6", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.185", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.154", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.106", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.46", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.10", "lessThanOrEqual": "7.1.*", "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": "4.6", "versionEndExcluding": "6.1.185" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.6.154" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.12.106" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.18.46" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "7.1.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "7.2" } ] } ] } ], "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" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-80572", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T19:17:35.214904Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:26:27.388Z" } } ] } }