CVE-2026-31624

Service interruption via unclamped HID report size

Published Apr 24, 2026 · Updated Apr 24, 2026

Undefined shift handling in the Linux Kernel HID core allows local users to interrupt service through a malformed HID report descriptor. The HID core's s32ton() shifts a 32-bit value by report_size minus one after the parser accepts sizes through 256, causing undefined shifts when hid_output_field() or hid_set_field() builds output. Triggering requires local access to present a crafted HID descriptor and affects availability, with no evidenced data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Undefined shift handling in the Linux Kernel HID core allows local users to interrupt service through a malformed HID report descriptor. The HID core's s32ton() shifts a 32-bit value by report_size minus one after the parser accepts sizes through 256, causing undefined shifts when hid_output_field() or hid_set_field() builds output. Triggering requires local access to present a crafted HID descriptor and affects availability, with no evidenced data disclosure or modification.

The record

CVE
CVE-2026-31624
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <58386f00af710922cafb0fb69211497beddfaa95
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8a8333237f1f5caab8d4c3d2c2e7578c4263a97f
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <97014719bb8fccb1ffcbbc299e84b1f11b114195
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ea363a34086ddb4231adc581a7f36c39ec154bfc

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <58386f00af710922cafb0fb69211497beddfaa95; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8a8333237f1f5caab8d4c3d2c2e7578c4263a97f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <97014719bb8fccb1ffcbbc299e84b1f11b114195; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ea363a34086ddb4231adc581a7f36c39ec154bfc

Published CVSS scores

4.7Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation for Defense Evasion

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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