CVE-2024-35825

Katalog CVE

CVSS 5.5 · Medium EPSS 0,23%

Kerentanan pada linux kernel, debian linux. Skor CVSS 3.1 5.5 (Medium) menurut NVD.

Deskripsi (NVD)

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: ncm: Fix handling of zero block length packets While connecting to a Linux host with CDC_NCM_NTB_DEF_SIZE_TX set to 65536, it has been observed that we receive short packets, which come at interval of 5-10 seconds sometimes and have block length zero but still contain 1-2 valid datagrams present. According to the NCM spec: "If wBlockLength = 0x0000, the block is terminated by a short packet. In this case, the USB transfer must still be shorter than dwNtbInMaxSize or dwNtbOutMaxSize. If exactly dwNtbInMaxSize or dwNtbOutMaxSize bytes are sent, and the size is a multiple of wMaxPacketSize for the given pipe, then no ZLP shall be sent. wBlockLength= 0x0000 must be used with extreme care, because of the possibility that the host and device may get out of sync, and because of test issues. wBlockLength = 0x0000 allows the sender to reduce latency by starting to send a very large NTB, and then shortening it when the sender discovers that there’s not sufficient data to justify sending a large NTB" However, there is a potential issue with the current implementation, as it checks for the occurrence of multiple NTBs in a single giveback by verifying if the leftover bytes to be processed is zero or not. If the block length reads zero, we would process the same NTB infintely because the leftover bytes is never zero and it leads to a crash. Fix this by bailing out if block length reads zero.

Rincian

Terbit di NVD

17 Mei 2024

Terakhir diubah

17 Juni 2026

Status NVD

Analyzed

CVSS 3.1

5.5 (Medium), sumber NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H · uraikan di kalkulator

EPSS (30 hari)

0,23% peluang dieksploitasi; lebih tinggi dari 12,9% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://git.kernel.org/stable/c/6b2c73111a252263807b7598682663dc33aa4b4c patch
• https://git.kernel.org/stable/c/7664ee8bd80309b90d53488b619764f0a057f2b7 patch
• https://git.kernel.org/stable/c/92b051b87658df7649ffcdef522593f21a2b296b patch
• https://git.kernel.org/stable/c/a0f77b5d6067285b8eca0ee3bd1e448a6258026f patch
• https://git.kernel.org/stable/c/a766761d206e7c36d7526e0ae749949d17ca582c patch
• https://git.kernel.org/stable/c/e2dbfea520e60d58e0c498ba41bde10452257779 patch
• https://git.kernel.org/stable/c/ef846cdbd100f7f9dc045e8bcd7fe4b3a3713c03 patch
• https://git.kernel.org/stable/c/f90ce1e04cbcc76639d6cba0fdbd820cd80b3c70 patch
• https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html advisory pihak ketiga
• https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html advisory pihak ketiga