{"id":"CVE-2026-80783","summary":"HID: magicmouse: prevent unbounded recursion in magicmouse_raw_event()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nHID: magicmouse: prevent unbounded recursion in magicmouse_raw_event()\n\nmagicmouse_raw_event() handles DOUBLE_REPORT_ID (0xf7) packets, which pack\ntwo touch reports into one, by splitting the packet and calling itself on\neach half. The only guard against runaway recursion is a \"size \u003c 1\" check,\nwhich stops zero-sized calls but does not bound the recursion depth.\n\nA malicious HID device that matches this driver can send a report starting\nwith DOUBLE_REPORT_ID and filled with the sequence [0xf7, 0x00]. Each level\nconsumes two bytes and recurses on the remainder, so an incoming report of\nup to HID_MAX_BUFFER_SIZE (16 KiB) drives roughly 8000 nested calls. That\neasily exhausts the 16 KiB kernel stack, leading to a stack overflow: a\npanic with CONFIG_VMAP_STACK, or memory corruption without it.\n\nA double report only ever wraps two normal reports; it is never\nlegitimately nested. Refuse to re-enter the DOUBLE_REPORT_ID case from a\nrecursive call so the recursion depth is bounded to two, while all valid\npackets keep being parsed exactly as before.","modified":"2026-09-06T03:46:43.083213836Z","published":"2026-09-04T15:12:54.859Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80783.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/26c45abed62536aabf4033fb6d64cf72e93374e9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/70589b0c005db003f6d8ae4db3c4d54fed7b83e4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8a10a624996f16628234306b46f0cf36707d78bd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a33a596d3ad8dfe6c96a368097a028abeee16c17"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bec338b07beb883726b32192c8f01c601bc76fda"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d095de37f78c5f32a4252ef0f99b84ba76550b86"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d16df755b4493b6d37803c628b2c621d096796a8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/db8d634128d2ba88d79c0b601e983ebe14bb0519"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80783.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80783"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"a462230e16acc8664145216da3c928d03556691a"},{"fixed":"26c45abed62536aabf4033fb6d64cf72e93374e9"},{"fixed":"8a10a624996f16628234306b46f0cf36707d78bd"},{"fixed":"d16df755b4493b6d37803c628b2c621d096796a8"},{"fixed":"bec338b07beb883726b32192c8f01c601bc76fda"},{"fixed":"70589b0c005db003f6d8ae4db3c4d54fed7b83e4"},{"fixed":"a33a596d3ad8dfe6c96a368097a028abeee16c17"},{"fixed":"d095de37f78c5f32a4252ef0f99b84ba76550b86"},{"fixed":"db8d634128d2ba88d79c0b601e983ebe14bb0519"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80783.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.37"},{"fixed":"5.15.220"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.187"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.156"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.108"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.49"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.11"}]},{"type":"ECOSYSTEM","events":[{"introduced":"7.2.0"},{"fixed":"7.2.1"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80783.json"}}],"schema_version":"1.9.0"}