CVE-2026-46151

Kernel heap disclosure via short printer response

Published May 28, 2026 · Updated May 28, 2026

Information disclosure in the Linux Kernel usblp driver allows local users to read stale kernel heap data through sysfs or ioctl. The driver discards a short USB control-transfer length, trusts the printer's larger length prefix, and exposes bytes left uninitialized in its 1,024-byte device-ID buffer. A connected USB printer must return the crafted two-byte response; subsequent reads disclose up to 1,021 attacker-sized bytes of stale heap data.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Information disclosure in the Linux Kernel usblp driver allows local users to read stale kernel heap data through sysfs or ioctl. The driver discards a short USB control-transfer length, trusts the printer's larger length prefix, and exposes bytes left uninitialized in its 1,024-byte device-ID buffer. A connected USB printer must return the crafted two-byte response; subsequent reads disclose up to 1,021 attacker-sized bytes of stale heap data.

The record

CVE
CVE-2026-46151
Published
May 28, 2026
Updated
May 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-401, 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 <522d17e93a85575256894212d10e5a1fa6f36529
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6d8142141c942c0d8e79343cffda9c44bb1f3f4f
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6e29c32a27218f2dcd4a4e9b0b3c5e7728640698
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7a400c6fe3617e31e690e3f7ca37bb335e0498f3
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8247f52d822180e94ccbfdab91613af386a4e34d

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 <522d17e93a85575256894212d10e5a1fa6f36529; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6d8142141c942c0d8e79343cffda9c44bb1f3f4f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6e29c32a27218f2dcd4a4e9b0b3c5e7728640698; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7a400c6fe3617e31e690e3f7ca37bb335e0498f3; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8247f52d822180e94ccbfdab91613af386a4e34d

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.6Amazon LinuxCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo