CVE-2025-38556
Published: August 21, 2025Last modified: August 21, 2025
Description
In the Linux kernel, the following vulnerability has been resolved: HID: core: Harden s32ton() against conversion to 0 bits Testing by the syzbot fuzzer showed that the HID core gets a shift-out-of-bounds exception when it tries to convert a 32-bit quantity to a 0-bit quantity. Ideally this should never occur, but there are buggy devices and some might have a report field with size set to zero; we shouldn't reject the report or the device just because of that. Instead, harden the s32ton() routine so that it returns a reasonable result instead of crashing when it is called with the number of bits set to 0 -- the same as what snto32() does.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.1 |
| Attack Vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity impact | NONE |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Fixed (6.1.159-r0) |
| 25 LTS | linux-lts | Fixed (6.12.51-r0) | |
| Stream | linux-lts | Fixed (6.12.46-r0) |
References
- https://git.kernel.org/stable/c/3c86548a20d7bc2861aa4de044991a327bebad1a
- https://git.kernel.org/stable/c/810189546cb6c8f36443ed091d91f1f5d2fc2ec7
- https://git.kernel.org/stable/c/865ad8469fa24de1559f247d9426ab01e5ce3a56
- https://git.kernel.org/stable/c/8b4a94b1510f6a46ec48494b52ee8f67eb4fc836
- https://git.kernel.org/stable/c/a6b87bfc2ab5bccb7ad953693c85d9062aef3fdd
- https://git.kernel.org/stable/c/d3b504146c111548ab60b6ef7aad00bfb1db05a2