CVE-2026-31607Network attack vector

Kernel memory corruption via oversized USB/IP response

Published Apr 24, 2026 · Updated Apr 24, 2026

Heap out-of-bounds write in Linux Kernel USB/IP clients allows remote attackers controlling a server to corrupt kernel memory. usbip_pack_ret_submit overwrites the URB packet count with an unchecked RET_SUBMIT value, which then bounds writes into the originally sized iso_frame_desc array. The client must process an isochronous response from a malicious or compromised USB/IP server; the overwrite can crash the kernel, while code execution has not been demonstrated.

CVSS severity9.8
Critical
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap out-of-bounds write in Linux Kernel USB/IP clients allows remote attackers controlling a server to corrupt kernel memory. usbip_pack_ret_submit overwrites the URB packet count with an unchecked RET_SUBMIT value, which then bounds writes into the originally sized iso_frame_desc array. The client must process an isochronous response from a malicious or compromised USB/IP server; the overwrite can crash the kernel, while code execution has not been demonstrated.

The record

CVE
CVE-2026-31607
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-805, CWE-787, T1203
Attack vector
network
Privileges
unauthenticated

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 <5e1c4ece08ccdc197177631f111845a2c68eede3
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8d155e2d1c4102f74f82a2bf9c016164bb0f7384
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <906f16a836de13fe61f49cdce2f66f2dbd14caf4
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ef8ebb1c637b4cfb61a9dd2e013376774ee2033b

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5e1c4ece08ccdc197177631f111845a2c68eede3; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8d155e2d1c4102f74f82a2bf9c016164bb0f7384; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <906f16a836de13fe61f49cdce2f66f2dbd14caf4; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ef8ebb1c637b4cfb61a9dd2e013376774ee2033b

Published CVSS scores

9.8kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.3Red Hat Security DataCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-805Buffer Access with Incorrect Length Value
CWE-787Out-of-bounds Write
T1203Exploitation for Client Execution

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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