CVE-2026-31624

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.

CVSS v3 5.5 MEDIUM

5.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/0ab048dbdb1daacf17d52e9252297eb6e1298e49
https://git.kernel.org/stable/c/58386f00af710922cafb0fb69211497beddfaa95	Patch
https://git.kernel.org/stable/c/69c02ffde6ed4d535fa4e693a9e572729cad3d0d	Patch
https://git.kernel.org/stable/c/76ad02854a30c394e0c076e6e6bed0a388573a94
https://git.kernel.org/stable/c/8a8333237f1f5caab8d4c3d2c2e7578c4263a97f	Patch
https://git.kernel.org/stable/c/932ae5309e53561197aa7d1606c7cf63af10e24f	Patch
https://git.kernel.org/stable/c/97014719bb8fccb1ffcbbc299e84b1f11b114195	Patch
https://git.kernel.org/stable/c/ea363a34086ddb4231adc581a7f36c39ec154bfc	Patch
https://git.kernel.org/stable/c/eb415ddaf25e09ddb8fe5736a70c9de2e6462534

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel:2.6.20:-::::::

History

No history.

Information

Published : 2026-04-24 15:16

Updated : 2026-06-17 10:34

NVD link : CVE-2026-31624

Mitre link : CVE-2026-31624

CVE.ORG link : CVE-2026-31624

JSON object : View

Products Affected

linux

linux_kernel

CWE

NVD-CWE-noinfo

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The HID parser bounds report_size\nonly to <= 256, so a broken HID device can supply a report descriptor\nwith a wide field that triggers shift exponents up to 256 on a 32-bit\ntype when an output report is built via hid_output_field() or\nhid_set_field().\n\nCommit ec61b41918587 (\"HID: core: fix shift-out-of-bounds in\nhid_report_raw_event\") added the same n > 32 clamp to the function\nsnto32(), but s32ton() was never given the same fix as I guess syzbot\nhadn't figured out how to fuzz a device the same way.\n\nFix this up by just clamping the max value of n, just like snto32()\ndoes."}], "lastModified": "2026-06-17T10:34:06.817", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "098695E6-95CE-401B-AC16-CEBD793B4DF1", "versionEndExcluding": "6.6.136", "versionStartIncluding": "2.6.20.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7F0AE5B5-23AC-4DCC-B37A-51CA1DAE7BA8", "versionEndExcluding": "6.12.83", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8126B8B8-6D0B-4443-86C1-672AEE893555", "versionEndExcluding": "6.18.24", "versionStartIncluding": "6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D6A8A074-BBF4-4803-ABED-519A839435BB", "versionEndExcluding": "6.19.14", "versionStartIncluding": "6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "9B5888AB-7403-4335-89E4-21CC0B48366A", "versionEndExcluding": "7.0.1", "versionStartIncluding": "7.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:2.6.20:-:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "5AE1560A-DECA-4BC6-87F6-F3F9ED544840"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}