CVE-2026-46167usb: usblp: fix uninitialized heap leak via LPGETSTATUS ioctl
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 builds before 0f7c41314ebf17049917a452684db371babf711a; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before cf24991619be317e2769310b4a367bf4a04b82bc; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 087d97342c100138ea7d75a50977c9c2319f957b; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before d06d937b0a4cdb8867f04275c8100a8b943da31a; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before a502b997668401a6821501fc98b7f9220f9b6ff2; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 762a6ccf391db0d629e590a803a3a2231e17dd3f; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 6b0e7438e31c74b01514d31ff35c1e688c4baaba; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before b38e53cbfb9d84732e5984fbd73e128d592415c5 | CNA record |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | all versions | CISA ADP |
linux linux_kernel linux:linux_kernel | from 2.6.12.1 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.140; from 6.7 before 6.12.88; from 6.13 before 6.18.30; from 6.19 before 7.0.7; 2.6.12; and 6 more ranges | NVD |
References
- https://git.kernel.org/stable/c/0f7c41314ebf17049917a452684db371babf711apatch
- https://git.kernel.org/stable/c/cf24991619be317e2769310b4a367bf4a04b82bcpatch
- https://git.kernel.org/stable/c/087d97342c100138ea7d75a50977c9c2319f957bpatch
- https://git.kernel.org/stable/c/d06d937b0a4cdb8867f04275c8100a8b943da31apatch
- https://git.kernel.org/stable/c/a502b997668401a6821501fc98b7f9220f9b6ff2patch
- https://git.kernel.org/stable/c/762a6ccf391db0d629e590a803a3a2231e17dd3fpatch
- https://git.kernel.org/stable/c/6b0e7438e31c74b01514d31ff35c1e688c4baabapatch
- https://git.kernel.org/stable/c/b38e53cbfb9d84732e5984fbd73e128d592415c5patch
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.