CVE-2026-46234Public exploit

Socket memory-limit bypass via reversed clamping

Published May 28, 2026 · Updated May 28, 2026

Buffer-size validation in affected Linux Kernel branches starting with 5.5 allows local users to exceed configured vsock memory limits. vsock_update_buffer_size() clamps the requested size to buffer_max_size before enforcing buffer_min_size, so a minimum above the maximum overwrites the upper bound. A local low-privileged user must configure a minimum above the maximum; the resulting vsk->buffer_size violates the intended socket memory boundary.

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

Buffer-size validation in affected Linux Kernel branches starting with 5.5 allows local users to exceed configured vsock memory limits. vsock_update_buffer_size() clamps the requested size to buffer_max_size before enforcing buffer_min_size, so a minimum above the maximum overwrites the upper bound. A local low-privileged user must configure a minimum above the maximum; the resulting vsk->buffer_size violates the intended socket memory boundary.

The record

CVE
CVE-2026-46234
Published
May 28, 2026
Updated
May 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-787, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 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=5.5
  2. Affected versionversion=b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 <0b68881501460c3761f196469e1e503218c5e536
  3. Affected versionversion=b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 <2602f7bb5818e92315feeaeb71d8ce4d5c9ab160
  4. Affected versionversion=b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 <310da27932dd0afe7ce7456dfe1f0814c3301f41
  5. Affected versionversion=b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 <a998a7e250bf976539e05a00ec64a81292afecaa
  6. Affected versionversion=b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 <d114bfdc9b76bf93b881e195b7ec957c14227bab

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.5; version=b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 <0b68881501460c3761f196469e1e503218c5e536; version=b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 <2602f7bb5818e92315feeaeb71d8ce4d5c9ab160; version=b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 <310da27932dd0afe7ce7456dfe1f0814c3301f41; version=b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 <a998a7e250bf976539e05a00ec64a81292afecaa; version=b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 <d114bfdc9b76bf93b881e195b7ec957c14227bab

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5SUSECVSS: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

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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 exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

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Technologies

Your stack

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Your stack

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