CVE-2026-74679

Description

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_ncm: Use unsigned int for ndp_index The variable ndp_index is declared as a signed integer, but it stores the return value of get_ncm(), which is unsigned. A malicious host can supply a large offset that overflows the signed ndp_index, making it negative. Because ndp_index is compared against unsigned bounds, this negative value bypasses sanity checks and leads to an out-of-bounds read when calculating the address of the NDP block (ntb_ptr + ndp_index). Fix this by changing ndp_index to unsigned int to ensure consistent unsigned comparisons throughout the function.

References

• https://git.kernel.org/stable/c/11413d7ed42174b8f5d8d0b6a25d10dc88239b21
• https://git.kernel.org/stable/c/5b2b3a3229a3f4c493ffdee53aee2f173b6f13b3
• https://git.kernel.org/stable/c/6b1c8a9403a26cb0fed7a648916c74dc236da591
• https://git.kernel.org/stable/c/9c8c6825a750fcd3efbe922847ca70ccd5a66857
• https://git.kernel.org/stable/c/a1c0deeba4a46481543d6b09c665f758c54c3a1a