{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-43421",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-05-01T14:12:56.008Z",
        "datePublished": "2026-05-08T14:21:56.363Z",
        "dateUpdated": "2026-10-15T01:19:23.793Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-06-19T11:58:36.714Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_ncm: Fix net_device lifecycle with device_move\n\nThe network device outlived its parent gadget device during\ndisconnection, resulting in dangling sysfs links and null pointer\ndereference problems.\n\nA prior attempt to solve this by removing SET_NETDEV_DEV entirely [1]\nwas reverted due to power management ordering concerns and a NO-CARRIER\nregression.\n\nA subsequent attempt to defer net_device allocation to bind [2] broke\n1:1 mapping between function instance and network device, making it\nimpossible for configfs to report the resolved interface name. This\nresults in a regression where the DHCP server fails on pmOS.\n\nUse device_move to reparent the net_device between the gadget device and\n/sys/devices/virtual/ across bind/unbind cycles. This preserves the\nnetwork interface across USB reconnection, allowing the DHCP server to\nretain their binding.\n\nIntroduce gether_attach_gadget()/gether_detach_gadget() helpers and use\n__free(detach_gadget) macro to undo attachment on bind failure. The\nbind_count ensures device_move executes only on the first bind.\n\n[1] https://lore.kernel.org/lkml/f2a4f9847617a0929d62025748384092e5f35cce.camel@crapouillou.net/\n[2] https://lore.kernel.org/linux-usb/795ea759-7eaf-4f78-81f4-01ffbf2d7961@ixit.cz/"
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/usb/gadget/function/f_ncm.c",
                        "drivers/usb/gadget/function/u_ether.c",
                        "drivers/usb/gadget/function/u_ether.h",
                        "drivers/usb/gadget/function/u_ncm.h"
                    ],
                    "versions": [
                        {
                            "version": "40d133d7f542616cf9538508a372306e626a16e9",
                            "lessThan": "7c97366f5dac5255e60a317ffe3a5b18f3745547",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "40d133d7f542616cf9538508a372306e626a16e9",
                            "lessThan": "36c41e9724c9a7a7cda37f5a4e9d94f25c8031c4",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "40d133d7f542616cf9538508a372306e626a16e9",
                            "lessThan": "93f116c3393a22acab96ad1bef12b2572eb80ca4",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "40d133d7f542616cf9538508a372306e626a16e9",
                            "lessThan": "e584cb58a2ea7ff4d3a4bc43d5ca512ed3ecb77d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "40d133d7f542616cf9538508a372306e626a16e9",
                            "lessThan": "85acaba2f42b557499bab3608307f17bf13beb69",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "40d133d7f542616cf9538508a372306e626a16e9",
                            "lessThan": "ec35c1969650e7cb6c8a91020e568ed46e3551b0",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/usb/gadget/function/f_ncm.c",
                        "drivers/usb/gadget/function/u_ether.c",
                        "drivers/usb/gadget/function/u_ether.h",
                        "drivers/usb/gadget/function/u_ncm.h"
                    ],
                    "versions": [
                        {
                            "version": "3.11",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "3.11",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.176",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.143",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.78",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.19",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.19.9",
                            "lessThanOrEqual": "6.19.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.11",
                                    "versionEndExcluding": "6.1.176"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.11",
                                    "versionEndExcluding": "6.6.143"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.11",
                                    "versionEndExcluding": "6.12.78"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.11",
                                    "versionEndExcluding": "6.18.19"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.11",
                                    "versionEndExcluding": "6.19.9"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.11",
                                    "versionEndExcluding": "7.0"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/7c97366f5dac5255e60a317ffe3a5b18f3745547"
                },
                {
                    "url": "https://git.kernel.org/stable/c/36c41e9724c9a7a7cda37f5a4e9d94f25c8031c4"
                },
                {
                    "url": "https://git.kernel.org/stable/c/93f116c3393a22acab96ad1bef12b2572eb80ca4"
                },
                {
                    "url": "https://git.kernel.org/stable/c/e584cb58a2ea7ff4d3a4bc43d5ca512ed3ecb77d"
                },
                {
                    "url": "https://git.kernel.org/stable/c/85acaba2f42b557499bab3608307f17bf13beb69"
                },
                {
                    "url": "https://git.kernel.org/stable/c/ec35c1969650e7cb6c8a91020e568ed46e3551b0"
                }
            ],
            "title": "usb: gadget: f_ncm: Fix net_device lifecycle with device_move",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        },
        "adp": [
            {
                "x_adpType": "supplier",
                "providerMetadata": {
                    "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
                    "shortName": "siemens-SADP",
                    "dateUpdated": "2026-10-15T01:19:23.793Z"
                },
                "affected": [
                    {
                        "vendor": "Siemens",
                        "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem",
                        "versions": [
                            {
                                "status": "affected",
                                "version": "0",
                                "lessThan": "*",
                                "versionType": "custom"
                            }
                        ],
                        "defaultStatus": "unknown"
                    }
                ],
                "references": [
                    {
                        "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"
                    }
                ]
            }
        ]
    }
}