{"id":"CVE-2026-80783","title":"HID: magicmouse: prevent unbounded recursion in magicmouse_raw_event()","summary":"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 int…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= a462230e16acc8664145216da3c928d03556691a < 26c45abed62536aabf4033fb6d64cf72e93374e9","Linux >= a462230e16acc8664145216da3c928d03556691a < 8a10a624996f16628234306b46f0cf36707d78bd","Linux >= a462230e16acc8664145216da3c928d03556691a < d16df755b4493b6d37803c628b2c621d096796a8","Linux >= a462230e16acc8664145216da3c928d03556691a < bec338b07beb883726b32192c8f01c601bc76fda","Linux >= a462230e16acc8664145216da3c928d03556691a < 70589b0c005db003f6d8ae4db3c4d54fed7b83e4","Linux >= a462230e16acc8664145216da3c928d03556691a < a33a596d3ad8dfe6c96a368097a028abeee16c17","Linux >= a462230e16acc8664145216da3c928d03556691a < d095de37f78c5f32a4252ef0f99b84ba76550b86","Linux >= a462230e16acc8664145216da3c928d03556691a < db8d634128d2ba88d79c0b601e983ebe14bb0519","Linux 2.6.37"],"published":"2026-09-04","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:43:38.543Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80783","references":[{"url":"https://git.kernel.org/stable/c/26c45abed62536aabf4033fb6d64cf72e93374e9"},{"url":"https://git.kernel.org/stable/c/8a10a624996f16628234306b46f0cf36707d78bd"},{"url":"https://git.kernel.org/stable/c/d16df755b4493b6d37803c628b2c621d096796a8"},{"url":"https://git.kernel.org/stable/c/bec338b07beb883726b32192c8f01c601bc76fda"},{"url":"https://git.kernel.org/stable/c/70589b0c005db003f6d8ae4db3c4d54fed7b83e4"},{"url":"https://git.kernel.org/stable/c/a33a596d3ad8dfe6c96a368097a028abeee16c17"},{"url":"https://git.kernel.org/stable/c/d095de37f78c5f32a4252ef0f99b84ba76550b86"},{"url":"https://git.kernel.org/stable/c/db8d634128d2ba88d79c0b601e983ebe14bb0519"}],"tags":["cve.org"],"epss":0.00195,"epssPercentile":0.08573,"ingestedAt":"2026-10-19T10:20:54.956Z","slug":"CVE-2026-80783","body":"## Overview\n\nIn 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 < 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.\n\n## Affected\n\n- `Linux >= a462230e16acc8664145216da3c928d03556691a < 26c45abed62536aabf4033fb6d64cf72e93374e9`\n- `Linux >= a462230e16acc8664145216da3c928d03556691a < 8a10a624996f16628234306b46f0cf36707d78bd`\n- `Linux >= a462230e16acc8664145216da3c928d03556691a < d16df755b4493b6d37803c628b2c621d096796a8`\n- `Linux >= a462230e16acc8664145216da3c928d03556691a < bec338b07beb883726b32192c8f01c601bc76fda`\n- `Linux >= a462230e16acc8664145216da3c928d03556691a < 70589b0c005db003f6d8ae4db3c4d54fed7b83e4`\n- `Linux >= a462230e16acc8664145216da3c928d03556691a < a33a596d3ad8dfe6c96a368097a028abeee16c17`\n- `Linux >= a462230e16acc8664145216da3c928d03556691a < d095de37f78c5f32a4252ef0f99b84ba76550b86`\n- `Linux >= a462230e16acc8664145216da3c928d03556691a < db8d634128d2ba88d79c0b601e983ebe14bb0519`\n- `Linux 2.6.37`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}