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CVE-2026-80783

HID: magicmouse: prevent unbounded recursion in magicmouse_raw_event()

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.15.220, 6.1.187, 6.6.156, 6.12.108, 6.18.49, and 2 more
None on Exploit-DB, Metasploit or GitHub

Summary

In the Linux kernel, the following vulnerability has been resolved: HID: magicmouse: prevent unbounded recursion in magicmouse_raw_event() magicmouse_raw_event() handles DOUBLE_REPORT_ID (0xf7) packets, which pack two touch reports into one, by splitting the packet and calling itself on each half. The only guard against runaway recursion is a "size < 1" check, which stops zero-sized calls but does not bound the recursion depth. A malicious HID device that matches this driver can send a report starting with DOUBLE_REPORT_ID and filled with the sequence [0xf7, 0x00]. Each level consumes two bytes and recurses on the remainder, so an incoming report of up to HID_MAX_BUFFER_SIZE (16 KiB) drives roughly 8000 nested calls. That easily exhausts the 16 KiB kernel stack, leading to a stack overflow: a panic with CONFIG_VMAP_STACK, or memory corruption without it. A double report only ever wraps two normal reports; it is never legitimately nested. Refuse to re-enter the DOUBLE_REPORT_ID case from a recursive call so the recursion depth is bounded to two, while all valid packets keep being parsed exactly as before.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From a462230e16acc8664145216da3c928d03556691a · fixed in 26c45abed62536aabf4033fb6d64cf72e93374e9; From a462230e16acc8664145216da3c928d03556691a · fixed in 8a10a624996f16628234306b46f0cf36707d78bd; From a462230e16acc8664145216da3c928d03556691a · fixed in d16df755b4493b6d37803c628b2c621d096796a8; From a462230e16acc8664145216da3c928d03556691a · fixed in bec338b07beb883726b32192c8f01c601bc76fda; From a462230e16acc8664145216da3c928d03556691a · fixed in 70589b0c005db003f6d8ae4db3c4d54fed7b83e4; From a462230e16acc8664145216da3c928d03556691a · fixed in a33a596d3ad8dfe6c96a368097a028abeee16c17; From a462230e16acc8664145216da3c928d03556691a · fixed in d095de37f78c5f32a4252ef0f99b84ba76550b86; From a462230e16acc8664145216da3c928d03556691a · fixed in db8d634128d2ba88d79c0b601e983ebe14bb0519

  • Linux Linux

    2.6.37

  • KernelLinux

    From 2.6.37 · fixed in 5.15.220; From 5.16.0 · fixed in 6.1.187; From 6.2.0 · fixed in 6.6.156; From 6.7.0 · fixed in 6.12.108; From 6.13.0 · fixed in 6.18.49; From 6.19.0 · fixed in 7.1.11; From 7.2.0 · fixed in 7.2.1

References 8

git.kernel.org