CVE-2026-46167

Kernel heap disclosure via uninitialized status buffer

Published May 28, 2026 · Updated May 28, 2026

Information disclosure in affected Linux Kernel releases allows local users to read one stale kernel-heap byte through LPGETSTATUS. usblp_ctrl_msg() discards the byte count from usb_control_msg(), so a zero-byte printer reply leaves the probe-time statusbuf uninitialized and copy_to_user() returns its sign-extended first byte. Exploitation requires access to the USB printer device, an LPGETSTATUS request, and an attached printer that returns zero bytes; each request discloses one stale byte.

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

Information disclosure in affected Linux Kernel releases allows local users to read one stale kernel-heap byte through LPGETSTATUS. usblp_ctrl_msg() discards the byte count from usb_control_msg(), so a zero-byte printer reply leaves the probe-time statusbuf uninitialized and copy_to_user() returns its sign-extended first byte. Exploitation requires access to the USB printer device, an LPGETSTATUS request, and an attached printer that returns zero bytes; each request discloses one stale byte.

The record

CVE
CVE-2026-46167
Published
May 28, 2026
Updated
May 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-908, T1005
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0 <6.12.88
  2. Affected versionversion=0 <6.18.30
  3. Affected versionversion=0 <6.6.140
  4. Affected versionversion=0 <7.0.7
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6b0e7438e31c74b01514d31ff35c1e688c4baaba
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <762a6ccf391db0d629e590a803a3a2231e17dd3f
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a502b997668401a6821501fc98b7f9220f9b6ff2
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b38e53cbfb9d84732e5984fbd73e128d592415c5
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d06d937b0a4cdb8867f04275c8100a8b943da31a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=0 <6.12.88; version=0 <6.18.30; version=0 <6.6.140; version=0 <7.0.7; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6b0e7438e31c74b01514d31ff35c1e688c4baaba; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <762a6ccf391db0d629e590a803a3a2231e17dd3f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a502b997668401a6821501fc98b7f9220f9b6ff2; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b38e53cbfb9d84732e5984fbd73e128d592415c5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d06d937b0a4cdb8867f04275c8100a8b943da31a

Published CVSS scores

5.5NIST National Vulnerability DatabaseCVSS: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

CWE-908Use of Uninitialized Resource
T1005Data from Local System

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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