CVE-2026-46151

Description

In the Linux kernel, the following vulnerability has been resolved: usb: usblp: fix heap leak in IEEE 1284 device ID via short response usblp_ctrl_msg() collapses the usb_control_msg() return value to 0/-errno, discarding the actual number of bytes transferred. A broken printer can complete the GET_DEVICE_ID control transfer short and the driver has no way to know. usblp_cache_device_id_string() reads the 2-byte big-endian length prefix from the response and trusts it (clamped only to the buffer bounds). The buffer is kmalloc(1024) at probe time. A device that sends exactly two bytes (e.g. 0x03 0xFF, claiming a 1023-byte ID) leaves device_id_string[2..1022] holding stale kmalloc heap. That stale data is then exposed: - via the ieee1284_id sysfs attribute (sprintf("%s", buf+2), truncated at the first NUL in the stale heap), and - via the IOCNR_GET_DEVICE_ID ioctl, which copy_to_user()s the full claimed length regardless of NULs, up to 1021 bytes of uninitialized heap, with the leak size chosen by the device. Fix this up by just zapping the buffer with zeros before each request sent to the device.

PUBLISHED Reserved 2026-05-13 | Published 2026-05-28 | Updated 2026-06-01 | Assigner Linux

Product status

References

git.kernel.org/...c/4650cce898fcd0bb8c33e529984687a8caed10c3

git.kernel.org/...c/612640abbd9e0947fe8f37aaf0cf324265d7caa4

git.kernel.org/...c/4220d4dd062ea3d3eb056a6cbe0b568e740d20b1

git.kernel.org/...c/6e29c32a27218f2dcd4a4e9b0b3c5e7728640698

git.kernel.org/...c/6d8142141c942c0d8e79343cffda9c44bb1f3f4f

git.kernel.org/...c/8247f52d822180e94ccbfdab91613af386a4e34d

git.kernel.org/...c/522d17e93a85575256894212d10e5a1fa6f36529

git.kernel.org/...c/7a400c6fe3617e31e690e3f7ca37bb335e0498f3

cve.org (CVE-2026-46151)

nvd.nist.gov (CVE-2026-46151)

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