Copyright © 2012 Red Hat, Inc. All rights reserved. Low 2026-05-28T00:00:00 kernel: usb: usblp: fix uninitialized heap leak via LPGETSTATUS ioctl 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CWE-824

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.

A flaw was found in the Linux kernel's `usblp` driver. A local user, interacting with a malicious printer, could exploit this vulnerability. When the `LPGETSTATUS` ioctl is used and a printer responds with zero bytes, the driver may return uninitialized kernel memory. This leads to information disclosure, potentially exposing sensitive data from the kernel's heap.

Red Hat Enterprise Linux 10 Fix deferred kernel Red Hat Enterprise Linux 6 Out of support scope kernel Red Hat Enterprise Linux 7 Fix deferred kernel Red Hat Enterprise Linux 7 Fix deferred kernel-rt Red Hat Enterprise Linux 8 Fix deferred kernel Red Hat Enterprise Linux 8 Fix deferred kernel-rt Red Hat Enterprise Linux 9 Fix deferred kernel Red Hat Enterprise Linux 9 Fix deferred kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-46167 https://nvd.nist.gov/vuln/detail/CVE-2026-46167 https://lore.kernel.org/linux-cve-announce/2026052826-CVE-2026-46167-478e@gregkh/T