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🛡️ CVE-2026-46167 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

usb: usblp: fix uninitialized heap leak via LPGETSTATUS ioctl

In the Linux kernel, the following vulnerability has been resolved:

usb: usblp: fix uninitialized heap leak via LPGETSTATUS ioctl

Just like in a previous problem in this driver, usblp_ctrl_msg() will

collapse the usb_control_msg() return value to 0/-errno, discarding the

actual number of bytes transferred.

Ideally that short command should be detected and error out, but many

printers are known to send "incorrect" responses back so we can't just

do that.

statusbuf is kmalloc(8) at probe time and never filled before the first

LPGETSTATUS ioctl.

usblp_read_status() requests 1 byte. If a malicious printer responds

with zero bytes, *statusbuf is one byte of stale kmalloc heap,

sign-extended into the local int status, which the LPGETSTATUS path then

copy_to_user()s directly to the ioctl caller.

Fix this all by just zapping out the memory buffer when allocated at

probe time. If a later call does a short read, the data will be

identical to what the device sent it the last time, so there is no

"leak" of information happening.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Affected software

CVE-2026-46167 is recorded against 2 packages.

  • kernel (from 6.19.0 up to 7.0.7)
  • linux-kernel

Timeline and source

Published on 28 May 2026 and last revised on 15 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2026-46167 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-05-28
Updated 2026-08-20
Modified 2026-08-15

Affected Packages

Software From version Fixed in
kernel 6.19.0 7.0.7
linux-kernel — —

References

Similar Threats

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