{"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":"2026-08-27T12:40:19.284Z"},"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"}}}}