CVE-2026-46167

01/Description

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.

02/Affected products

linux: linux kernel

03/References9

• git.kernel.org/stable/c/087d97342c100138ea7d75a50977c9c2319f957b Patch
• git.kernel.org/stable/c/0f7c41314ebf17049917a452684db371babf711a Patch
• git.kernel.org/stable/c/6b0e7438e31c74b01514d31ff35c1e688c4baaba Patch
• git.kernel.org/stable/c/762a6ccf391db0d629e590a803a3a2231e17dd3f Patch
• git.kernel.org/stable/c/a502b997668401a6821501fc98b7f9220f9b6ff2 Patch
• git.kernel.org/stable/c/b38e53cbfb9d84732e5984fbd73e128d592415c5 Patch
• git.kernel.org/stable/c/cf24991619be317e2769310b4a367bf4a04b82bc Patch
• git.kernel.org/stable/c/d06d937b0a4cdb8867f04275c8100a8b943da31a Patch
• cert-portal.siemens.com/productcert/html/ssa-784472.html