HID: core: clamp report_size in s32ton() to avoid undefined shift

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Summary

CVECVE-2026-31624
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-24 15:16:41 UTC
Updated2026-06-01 17:16:53 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000180000 probability, percentile 0.048130000 (date 2026-04-27)

Problem Types: NVD-CWE-noinfo

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected dde5845a529ff753364a6d1aea61180946270bfa 76ad02854a30c394e0c076e6e6bed0a388573a94 git Not specified
CNA Linux Linux affected dde5845a529ff753364a6d1aea61180946270bfa eb415ddaf25e09ddb8fe5736a70c9de2e6462534 git Not specified
CNA Linux Linux affected dde5845a529ff753364a6d1aea61180946270bfa 0ab048dbdb1daacf17d52e9252297eb6e1298e49 git Not specified
CNA Linux Linux affected dde5845a529ff753364a6d1aea61180946270bfa 932ae5309e53561197aa7d1606c7cf63af10e24f git Not specified
CNA Linux Linux affected dde5845a529ff753364a6d1aea61180946270bfa 58386f00af710922cafb0fb69211497beddfaa95 git Not specified
CNA Linux Linux affected dde5845a529ff753364a6d1aea61180946270bfa 8a8333237f1f5caab8d4c3d2c2e7578c4263a97f git Not specified
CNA Linux Linux affected dde5845a529ff753364a6d1aea61180946270bfa ea363a34086ddb4231adc581a7f36c39ec154bfc git Not specified
CNA Linux Linux affected dde5845a529ff753364a6d1aea61180946270bfa 97014719bb8fccb1ffcbbc299e84b1f11b114195 git Not specified
CNA Linux Linux affected dde5845a529ff753364a6d1aea61180946270bfa 69c02ffde6ed4d535fa4e693a9e572729cad3d0d git Not specified
CNA Linux Linux affected 2.6.20 Not specified
CNA Linux Linux unaffected 2.6.20 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.136 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.83 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.24 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.14 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0.1 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/932ae5309e53561197aa7d1606c7cf63af10e24f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ea363a34086ddb4231adc581a7f36c39ec154bfc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/69c02ffde6ed4d535fa4e693a9e572729cad3d0d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/8a8333237f1f5caab8d4c3d2c2e7578c4263a97f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/eb415ddaf25e09ddb8fe5736a70c9de2e6462534 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/76ad02854a30c394e0c076e6e6bed0a388573a94 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0ab048dbdb1daacf17d52e9252297eb6e1298e49 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/58386f00af710922cafb0fb69211497beddfaa95 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/97014719bb8fccb1ffcbbc299e84b1f11b114195 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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