CVE-2026-31624
Description
In the Linux kernel, the following vulnerability has been resolved: HID: core: clamp report_size in s32ton() to avoid undefined shift s32ton() shifts by n-1 where n is the field's report_size, a value that comes directly from a HID device. The HID parser bounds report_size only to <= 256, so a broken HID device can supply a report descriptor with a wide field that triggers shift exponents up to 256 on a 32-bit type when an output report is built via hid_output_field() or hid_set_field(). Commit ec61b41918587 ("HID: core: fix shift-out-of-bounds in hid_report_raw_event") added the same n > 32 clamp to the function snto32(), but s32ton() was never given the same fix as I guess syzbot hadn't figured out how to fuzz a device the same way. Fix this up by just clamping the max value of n, just like snto32() does.
How to fix
- linux linux_kernel6.6.136, 6.12.83, 6.18.24, 6.19.14, 7.0.1 or later
- git.kernel.org/stable/c/58386f00af710922cafb0fb69211497beddfaa95
- git.kernel.org/stable/c/69c02ffde6ed4d535fa4e693a9e572729cad3d0d
- git.kernel.org/stable/c/8a8333237f1f5caab8d4c3d2c2e7578c4263a97f
- git.kernel.org/stable/c/932ae5309e53561197aa7d1606c7cf63af10e24f
- git.kernel.org/stable/c/97014719bb8fccb1ffcbbc299e84b1f11b114195
- git.kernel.org/stable/c/ea363a34086ddb4231adc581a7f36c39ec154bfc
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 2.6.20.1 ≤ v < 6.6.136, 6.7 ≤ v < 6.12.83, 6.13 ≤ v < 6.18.24, 6.19 ≤ v < 6.19.14, 7.0 ≤ v < 7.0.1, 2.6.20 | 6.6.136, 6.12.83, 6.18.24, 6.19.14, 7.0.1 |
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