Description

In the Linux kernel, the following vulnerability has been resolved:

HID: core: Fix assumption that Resolution Multipliers must be in Logical Collections

A report in 2019 by the syzbot fuzzer was found to be connected to two
errors in the HID core associated with Resolution Multipliers. One of
the errors was fixed by commit ea427a222d8b ("HID: core: Fix deadloop
in hid_apply_multiplier."), but the other has not been fixed.

This error arises because hid_apply_multipler() assumes that every
Resolution Multiplier control is contained in a Logical Collection,
i.e., there's no way the routine can ever set multiplier_collection to
NULL. This is in spite of the fact that the function starts with a
big comment saying:

* "The Resolution Multiplier control must be contained in the same
* Logical Collection as the control(s) to which it is to be applied.
...
* If no Logical Collection is
* defined, the Resolution Multiplier is associated with all
* controls in the report."
* HID Usage Table, v1.12, Section 4.3.1, p30
*
* Thus, search from the current collection upwards until we find a
* logical collection...

The comment and the code overlook the possibility that none of the
collections found may be a Logical Collection.

The fix is to set the multiplier_collection pointer to NULL if the
collection found isn't a Logical Collection.

Classification

CVE ID: CVE-2024-57986

Affected Products

Vendor: Linux, Linux

Product: Linux, Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.05% (probability of being exploited)

EPSS Percentile: 10.65% (scored less or equal to compared to others)

EPSS Date: 2025-03-27 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2024-57986
https://git.kernel.org/stable/c/bebf542e8d7c44a18a95f306b1b5dc160c823506
https://git.kernel.org/stable/c/ed3d3883476423f337aac0f22c521819b3f1e970
https://git.kernel.org/stable/c/ebaeca33d32c8bdb705a8c88267737a456f354b1
https://git.kernel.org/stable/c/a5498f1f864ea26f4c613c77f54409c776a95a90
https://git.kernel.org/stable/c/64f2657b579343cf923aa933f08074e6258eb07b

Timeline