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CVE-2024-27405 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: ncm: Avoid dropping datagrams of properly parsed NTBs It is observed sometimes when tethering is used over NCM with Windows 11 as host, at some instances, the gadget_giveback has one byte appended at the end of a proper NTB. When the NTB is parsed, unwrap call looks for any leftover bytes in SKB provided by u_ether and if there are any pending bytes, it treats them as a separate NTB and parses it. But in case the second NTB (as per unwrap call) is faulty/corrupt, all the datagrams that were parsed properly in the first NTB and saved in rx_list are dropped. Adding a few custom traces showed the following: [002] d..1 7828.532866: dwc3_gadget_giveback: ep1out: req 000000003868811a length 1025/16384 zsI ==> 0 [002] d..1 7828.532867: ncm_unwrap_ntb: K: ncm_unwrap_ntb toprocess: 1025 [002] d..1 7828.532867: ncm_unwrap_ntb: K: ncm_unwrap_ntb nth: 1751999342 [002] d..1 7828.532868: ncm_unwrap_ntb: K: ncm_unwrap_ntb seq: 0xce67 [002] d..1 7828.532868: ncm_unwrap_ntb: K: ncm_unwrap_ntb blk_len: 0x400 [002] d..1 7828.532868: ncm_unwrap_ntb: K: ncm_unwrap_ntb ndp_len: 0x10 [002] d..1 7828.532869: ncm_unwrap_ntb: K: Parsed NTB with 1 frames In this case, the giveback is of 1025 bytes and block length is 1024. The rest 1 byte (which is 0x00) won't be parsed resulting in drop of all datagrams in rx_list. Same is case with packets of size 2048: [002] d..1 7828.557948: dwc3_gadget_giveback: ep1out: req 0000000011dfd96e length 2049/16384 zsI ==> 0 [002] d..1 7828.557949: ncm_unwrap_ntb: K: ncm_unwrap_ntb nth: 1751999342 [002] d..1 7828.557950: ncm_unwrap_ntb: K: ncm_unwrap_ntb blk_len: 0x800 Lecroy shows one byte coming in extra confirming that the byte is coming in from PC: Transfer 2959 - Bytes Transferred(1025) Timestamp((18.524 843 590) - Transaction 8391 - Data(1025 bytes) Timestamp(18.524 843 590) --- Packet 4063861 Data(1024 bytes) Duration(2.117us) Idle(14.700ns) Timestamp(18.524 843 590) --- Packet 4063863 Data(1 byte) Duration(66.160ns) Time(282.000ns) Timestamp(18.524 845 722) According to Windows driver, no ZLP is needed if wBlockLength is non-zero, because the non-zero wBlockLength has already told the function side the size of transfer to be expected. However, there are in-market NCM devices that rely on ZLP as long as the wBlockLength is multiple of wMaxPacketSize. To deal with such devices, it pads an extra 0 at end so the transfer is no longer multiple of wMaxPacketSize.


Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

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Hyperlink Resource
https://git.kernel.org/stable/c/059285e04ebb273d32323fbad5431c5b94f77e48
https://git.kernel.org/stable/c/059285e04ebb273d32323fbad5431c5b94f77e48
https://git.kernel.org/stable/c/2b7ec68869d50ea998908af43b643bca7e54577e
https://git.kernel.org/stable/c/2b7ec68869d50ea998908af43b643bca7e54577e
https://git.kernel.org/stable/c/2cb66b62a5d64ccf09b0591ab86fb085fa491fc5
https://git.kernel.org/stable/c/2cb66b62a5d64ccf09b0591ab86fb085fa491fc5
https://git.kernel.org/stable/c/35b604a37ec70d68b19dafd10bbacf1db505c9ca
https://git.kernel.org/stable/c/35b604a37ec70d68b19dafd10bbacf1db505c9ca
https://git.kernel.org/stable/c/57ca0e16f393bb21d69734e536e383a3a4c665fd
https://git.kernel.org/stable/c/57ca0e16f393bb21d69734e536e383a3a4c665fd
https://git.kernel.org/stable/c/76c51146820c5dac629f21deafab0a7039bc3ccd
https://git.kernel.org/stable/c/76c51146820c5dac629f21deafab0a7039bc3ccd
https://git.kernel.org/stable/c/a31cf46d108dabce3df80b3e5c07661e24912151
https://git.kernel.org/stable/c/a31cf46d108dabce3df80b3e5c07661e24912151
https://git.kernel.org/stable/c/c7f43900bc723203d7554d299a2ce844054fab8e
https://git.kernel.org/stable/c/c7f43900bc723203d7554d299a2ce844054fab8e
https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html

Weakness Enumeration

CWE-ID CWE Name Source
CWE-476 NULL Pointer Dereference CISA-ADP  

Change History

7 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2024-27405
NVD Published Date:
05/17/2024
NVD Last Modified:
11/21/2024
Source:
kernel.org