CVE-2026-31624 (GCVE-0-2026-31624)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:42 – Updated: 2026-04-25 05:48
VLAI?
Title
HID: core: clamp report_size in s32ton() to avoid undefined shift
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: dde5845a529ff753364a6d1aea61180946270bfa , < 58386f00af710922cafb0fb69211497beddfaa95 (git)
Affected: dde5845a529ff753364a6d1aea61180946270bfa , < 8a8333237f1f5caab8d4c3d2c2e7578c4263a97f (git)
Affected: dde5845a529ff753364a6d1aea61180946270bfa , < ea363a34086ddb4231adc581a7f36c39ec154bfc (git)
Affected: dde5845a529ff753364a6d1aea61180946270bfa , < 97014719bb8fccb1ffcbbc299e84b1f11b114195 (git)
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    Linux Linux Affected: 2.6.20
Unaffected: 0 , < 2.6.20 (semver)
Unaffected: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0.1 , ≤ 7.0.* (semver)
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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