{"id":"CVE-2024-27405","state":"PUBLISHED","title":"usb: gadget: ncm: Avoid dropping datagrams of properly parsed NTBs","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: ncm: Avoid dropping datagrams of properly parsed NTBs\n\nIt is observed sometimes when tethering is used over NCM with Windows 11\nas host, at some instances, the gadget_giveback has one byte appended at\nthe end of a proper NTB. When the NTB is parsed, unwrap call looks for\nany leftover bytes in SKB provided by u_ether and if there are any pending\nbytes, it treats them as a separate NTB and parses it. But in case the\nsecond NTB (as per unwrap call) is faulty/corrupt, all the datagrams that\nwere parsed properly in the first NTB and saved in rx_list are dropped.\n\nAdding a few custom traces showed the following:\n[002] d..1  7828.532866: dwc3_gadget_giveback: ep1out:\nreq 000000003868811a length 1025/16384 zsI ==> 0\n[002] d..1  7828.532867: ncm_unwrap_ntb: K: ncm_unwrap_ntb toprocess: 1025\n[002] d..1  7828.532867: ncm_unwrap_ntb: K: ncm_unwrap_ntb nth: 1751999342\n[002] d..1  7828.532868: ncm_unwrap_ntb: K: ncm_unwrap_ntb seq: 0xce67\n[002] d..1  7828.532868: ncm_unwrap_ntb: K: ncm_unwrap_ntb blk_len: 0x400\n[002] d..1  7828.532868: ncm_unwrap_ntb: K: ncm_unwrap_ntb ndp_len: 0x10\n[002] d..1  7828.532869: ncm_unwrap_ntb: K: Parsed NTB with 1 frames\n\nIn this case, the giveback is of 1025 bytes and block length is 1024.\nThe rest 1 byte (which is 0x00) won't be parsed resulting in drop of\nall datagrams in rx_list.\n\nSame is case with packets of size 2048:\n[002] d..1  7828.557948: dwc3_gadget_giveback: ep1out:\nreq 0000000011dfd96e length 2049/16384 zsI ==> 0\n[002] d..1  7828.557949: ncm_unwrap_ntb: K: ncm_unwrap_ntb nth: 1751999342\n[002] d..1  7828.557950: ncm_unwrap_ntb: K: ncm_unwrap_ntb blk_len: 0x800\n\nLecroy shows one byte coming in extra confirming that the byte is coming\nin from PC:\n\n Transfer 2959 - Bytes Transferred(1025)  Timestamp((18.524 843 590)\n - Transaction 8391 - Data(1025 bytes) Timestamp(18.524 843 590)\n --- Packet 4063861\n       Data(1024 bytes)\n       Duration(2.117us) Idle(14.700ns) Timestamp(18.524 843 590)\n --- Packet 4063863\n       Data(1 byte)\n       Duration(66.160ns) Time(282.000ns) Timestamp(18.524 845 722)\n\nAccording to Windows driver, no ZLP is needed if wBlockLength is non-zero,\nbecause the non-zero wBlockLength has already told the function side the\nsize of transfer to be expected. However, there are in-market NCM devices\nthat rely on ZLP as long as the wBlockLength is multiple of wMaxPacketSize.\nTo deal with such devices, it pads an extra 0 at end so the transfer is no\nlonger multiple of wMaxPacketSize.","publishedAt":"2024-05-17T11:40:25.069Z","updatedAt":"2026-05-11T20:10:23.186Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"CISA-ADP"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"9f6ce4240a2bf456402c15c06768059e5973f28c","status":"affected","lessThan":"059285e04ebb273d32323fbad5431c5b94f77e48","versionType":"git"},{"version":"9f6ce4240a2bf456402c15c06768059e5973f28c","status":"affected","lessThan":"a31cf46d108dabce3df80b3e5c07661e24912151","versionType":"git"},{"version":"9f6ce4240a2bf456402c15c06768059e5973f28c","status":"affected","lessThan":"57ca0e16f393bb21d69734e536e383a3a4c665fd","versionType":"git"},{"version":"9f6ce4240a2bf456402c15c06768059e5973f28c","status":"affected","lessThan":"2cb66b62a5d64ccf09b0591ab86fb085fa491fc5","versionType":"git"},{"version":"9f6ce4240a2bf456402c15c06768059e5973f28c","status":"affected","lessThan":"35b604a37ec70d68b19dafd10bbacf1db505c9ca","versionType":"git"},{"version":"9f6ce4240a2bf456402c15c06768059e5973f28c","status":"affected","lessThan":"2b7ec68869d50ea998908af43b643bca7e54577e","versionType":"git"},{"version":"9f6ce4240a2bf456402c15c06768059e5973f28c","status":"affected","lessThan":"c7f43900bc723203d7554d299a2ce844054fab8e","versionType":"git"},{"version":"9f6ce4240a2bf456402c15c06768059e5973f28c","status":"affected","lessThan":"76c51146820c5dac629f21deafab0a7039bc3ccd","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/gadget/function/f_ncm.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.38","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.38","versionType":"semver"},{"version":"4.19.308","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.270","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.211","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.150","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.80","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.19","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.7.7","status":"unaffected","lessThanOrEqual":"6.7.*","versionType":"semver"},{"version":"6.8","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/gadget/function/f_ncm.c"]}],"references":["https://git.kernel.org/stable/c/059285e04ebb273d32323fbad5431c5b94f77e48","https://git.kernel.org/stable/c/a31cf46d108dabce3df80b3e5c07661e24912151","https://git.kernel.org/stable/c/57ca0e16f393bb21d69734e536e383a3a4c665fd","https://git.kernel.org/stable/c/2cb66b62a5d64ccf09b0591ab86fb085fa491fc5","https://git.kernel.org/stable/c/35b604a37ec70d68b19dafd10bbacf1db505c9ca","https://git.kernel.org/stable/c/2b7ec68869d50ea998908af43b643bca7e54577e","https://git.kernel.org/stable/c/c7f43900bc723203d7554d299a2ce844054fab8e","https://git.kernel.org/stable/c/76c51146820c5dac629f21deafab0a7039bc3ccd","https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html","https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html"],"weaknesses":["CWE-476"],"ingestedAt":"2026-10-29T20:07:10.607Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2024/27xxx/CVE-2024-27405.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-27405","state":"PUBLISHED","datePublished":"2024-05-17T11:40:25.069Z","dateUpdated":"2026-05-11T20:10:23.186Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-02-25T13:47:42.681Z"},"containers":{"cna":{"title":"usb: gadget: ncm: Avoid dropping datagrams of properly parsed NTBs","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: ncm: Avoid dropping datagrams of properly parsed NTBs\n\nIt is observed sometimes when tethering is used over NCM with Windows 11\nas host, at some instances, the gadget_giveback has one byte appended at\nthe end of a proper NTB. When the NTB is parsed, unwrap call looks for\nany leftover bytes in SKB provided by u_ether and if there are any pending\nbytes, it treats them as a separate NTB and parses it. But in case the\nsecond NTB (as per unwrap call) is faulty/corrupt, all the datagrams that\nwere parsed properly in the first NTB and saved in rx_list are dropped.\n\nAdding a few custom traces showed the following:\n[002] d..1  7828.532866: dwc3_gadget_giveback: ep1out:\nreq 000000003868811a length 1025/16384 zsI ==> 0\n[002] d..1  7828.532867: ncm_unwrap_ntb: K: ncm_unwrap_ntb toprocess: 1025\n[002] d..1  7828.532867: ncm_unwrap_ntb: K: ncm_unwrap_ntb nth: 1751999342\n[002] d..1  7828.532868: ncm_unwrap_ntb: K: ncm_unwrap_ntb seq: 0xce67\n[002] d..1  7828.532868: ncm_unwrap_ntb: K: ncm_unwrap_ntb blk_len: 0x400\n[002] d..1  7828.532868: ncm_unwrap_ntb: K: ncm_unwrap_ntb ndp_len: 0x10\n[002] d..1  7828.532869: ncm_unwrap_ntb: K: Parsed NTB with 1 frames\n\nIn this case, the giveback is of 1025 bytes and block length is 1024.\nThe rest 1 byte (which is 0x00) won't be parsed resulting in drop of\nall datagrams in rx_list.\n\nSame is case with packets of size 2048:\n[002] d..1  7828.557948: dwc3_gadget_giveback: ep1out:\nreq 0000000011dfd96e length 2049/16384 zsI ==> 0\n[002] d..1  7828.557949: ncm_unwrap_ntb: K: ncm_unwrap_ntb nth: 1751999342\n[002] d..1  7828.557950: ncm_unwrap_ntb: K: ncm_unwrap_ntb blk_len: 0x800\n\nLecroy shows one byte coming in extra confirming that the byte is coming\nin from PC:\n\n Transfer 2959 - Bytes Transferred(1025)  Timestamp((18.524 843 590)\n - Transaction 8391 - Data(1025 bytes) Timestamp(18.524 843 590)\n --- Packet 4063861\n       Data(1024 bytes)\n       Duration(2.117us) Idle(14.700ns) Timestamp(18.524 843 590)\n --- Packet 4063863\n       Data(1 byte)\n       Duration(66.160ns) Time(282.000ns) Timestamp(18.524 845 722)\n\nAccording to Windows driver, no ZLP is needed if wBlockLength is non-zero,\nbecause the non-zero wBlockLength has already told the function side the\nsize of transfer to be expected. However, there are in-market NCM devices\nthat rely on ZLP as long as the wBlockLength is multiple of wMaxPacketSize.\nTo deal with such devices, it pads an extra 0 at end so the transfer is no\nlonger multiple of wMaxPacketSize."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"9f6ce4240a2bf456402c15c06768059e5973f28c","status":"affected","lessThan":"059285e04ebb273d32323fbad5431c5b94f77e48","versionType":"git"},{"version":"9f6ce4240a2bf456402c15c06768059e5973f28c","status":"affected","lessThan":"a31cf46d108dabce3df80b3e5c07661e24912151","versionType":"git"},{"version":"9f6ce4240a2bf456402c15c06768059e5973f28c","status":"affected","lessThan":"57ca0e16f393bb21d69734e536e383a3a4c665fd","versionType":"git"},{"version":"9f6ce4240a2bf456402c15c06768059e5973f28c","status":"affected","lessThan":"2cb66b62a5d64ccf09b0591ab86fb085fa491fc5","versionType":"git"},{"version":"9f6ce4240a2bf456402c15c06768059e5973f28c","status":"affected","lessThan":"35b604a37ec70d68b19dafd10bbacf1db505c9ca","versionType":"git"},{"version":"9f6ce4240a2bf456402c15c06768059e5973f28c","status":"affected","lessThan":"2b7ec68869d50ea998908af43b643bca7e54577e","versionType":"git"},{"version":"9f6ce4240a2bf456402c15c06768059e5973f28c","status":"affected","lessThan":"c7f43900bc723203d7554d299a2ce844054fab8e","versionType":"git"},{"version":"9f6ce4240a2bf456402c15c06768059e5973f28c","status":"affected","lessThan":"76c51146820c5dac629f21deafab0a7039bc3ccd","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/gadget/function/f_ncm.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.38","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.38","versionType":"semver"},{"version":"4.19.308","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.270","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.211","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.150","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.80","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.19","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.7.7","status":"unaffected","lessThanOrEqual":"6.7.*","versionType":"semver"},{"version":"6.8","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/gadget/function/f_ncm.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/059285e04ebb273d32323fbad5431c5b94f77e48"},{"url":"https://git.kernel.org/stable/c/a31cf46d108dabce3df80b3e5c07661e24912151"},{"url":"https://git.kernel.org/stable/c/57ca0e16f393bb21d69734e536e383a3a4c665fd"},{"url":"https://git.kernel.org/stable/c/2cb66b62a5d64ccf09b0591ab86fb085fa491fc5"},{"url":"https://git.kernel.org/stable/c/35b604a37ec70d68b19dafd10bbacf1db505c9ca"},{"url":"https://git.kernel.org/stable/c/2b7ec68869d50ea998908af43b643bca7e54577e"},{"url":"https://git.kernel.org/stable/c/c7f43900bc723203d7554d299a2ce844054fab8e"},{"url":"https://git.kernel.org/stable/c/76c51146820c5dac629f21deafab0a7039bc3ccd"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T20:10:23.186Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"4.19.308"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"5.4.270"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"5.10.211"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"5.15.150"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"6.1.80"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"6.6.19"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"6.7.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"6.8"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA 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Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-476","type":"CWE","lang":"en","description":"CWE-476 NULL Pointer Dereference"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-01-28T16:38:24.854Z"}},{"title":"CVE Program 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