CVE-2026-31617
kernel: usb: gadget: f_ncm: validate minimum block_len in ncm_unwrap_ntb()
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · April 24, 2026
Updated · October 15, 2026
Description
A flaw was found in the Linux kernel's USB Network Control Model (NCM) gadget driver. A malicious USB host could exploit an integer underflow vulnerability when processing Network Transfer Block (NTB) headers. This allows the host to manipulate internal data pointers, causing adjacent kernel memory to be copied into network buffers. This issue can lead to information disclosure from the kernel.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-191 · Integer Underflow (Wrap or Wraparound)