CVE - CVE-2024-35825

CVE-ID
CVE-2024-35825	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/6b2c73111a252263807b7598682663dc33aa4b4c URL:https://git.kernel.org/stable/c/6b2c73111a252263807b7598682663dc33aa4b4c MISC:https://git.kernel.org/stable/c/7664ee8bd80309b90d53488b619764f0a057f2b7 URL:https://git.kernel.org/stable/c/7664ee8bd80309b90d53488b619764f0a057f2b7 MISC:https://git.kernel.org/stable/c/92b051b87658df7649ffcdef522593f21a2b296b URL:https://git.kernel.org/stable/c/92b051b87658df7649ffcdef522593f21a2b296b MISC:https://git.kernel.org/stable/c/a0f77b5d6067285b8eca0ee3bd1e448a6258026f URL:https://git.kernel.org/stable/c/a0f77b5d6067285b8eca0ee3bd1e448a6258026f MISC:https://git.kernel.org/stable/c/a766761d206e7c36d7526e0ae749949d17ca582c URL:https://git.kernel.org/stable/c/a766761d206e7c36d7526e0ae749949d17ca582c MISC:https://git.kernel.org/stable/c/e2dbfea520e60d58e0c498ba41bde10452257779 URL:https://git.kernel.org/stable/c/e2dbfea520e60d58e0c498ba41bde10452257779 MISC:https://git.kernel.org/stable/c/ef846cdbd100f7f9dc045e8bcd7fe4b3a3713c03 URL:https://git.kernel.org/stable/c/ef846cdbd100f7f9dc045e8bcd7fe4b3a3713c03 MISC:https://git.kernel.org/stable/c/f90ce1e04cbcc76639d6cba0fdbd820cd80b3c70 URL:https://git.kernel.org/stable/c/f90ce1e04cbcc76639d6cba0fdbd820cd80b3c70
Assigning CNA
kernel.org
Date Record Created
20240517	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240517)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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