{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-80854",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-08-26T14:34:25.797Z",
        "datePublished": "2026-09-04T15:55:06.478Z",
        "dateUpdated": "2026-10-19T08:44:48.320Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-19T08:44:48.320Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_tcm: keep port count until LUN teardown completes\n\ntcm_usbg_drop_nexus() permits session removal once tpg_port_count\nreaches zero. However, usbg_port_unlink() currently decrements that\ncount from the fabric_pre_unlink() callback, before core_dev_del_lun()\nwaits for active se_lun references to drain.\n\nIf removal of the last LUN races a nexus removal, the latter can observe\na zero port count and call target_remove_session(). This frees\nsess_cmd_map while an in-flight struct usbg_cmd, including its work item,\ncan still be accessed.\n\nOverlapping the last-LUN unlink with nexus removal reproduces this\nlifetime violation as a DEBUG_OBJECTS \"free active\" warning for\nusbg_cmd_work, followed by a target-core BUG/Oops.\n\nThe generic target-core unlink path has no callback after\ncore_dev_del_lun() completes. Add an optional fabric_post_unlink()\ncallback and use it for the f_tcm port count. The count now remains\nnonzero until core_dev_del_lun() has finished draining active LUN\nreferences, preventing nexus removal from freeing the session during\ncommand completion."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/target/target_core_fabric_configfs.c",
                        "drivers/usb/gadget/function/f_tcm.c",
                        "include/target/target_core_fabric.h"
                    ],
                    "versions": [
                        {
                            "version": "c52661d60f636d17e26ad834457db333bd1df494",
                            "lessThan": "c494c5562ca69b61a82f566e3b87a445d2c28929",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c52661d60f636d17e26ad834457db333bd1df494",
                            "lessThan": "c1f359d9a5efed458946063de65ddbeaacc4f165",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c52661d60f636d17e26ad834457db333bd1df494",
                            "lessThan": "178f59a0bccd3f66cdfa5184310f31a58b7257c4",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c52661d60f636d17e26ad834457db333bd1df494",
                            "lessThan": "ad6f0375d2e93a1d8c015463e5e92dfcb26e311b",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c52661d60f636d17e26ad834457db333bd1df494",
                            "lessThan": "2efbfd42441d3ef8137aff2d59e9835e1d5ae780",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c52661d60f636d17e26ad834457db333bd1df494",
                            "lessThan": "85aa61fedcb4eb13f3dc5db73f6dc359f41f5d95",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c52661d60f636d17e26ad834457db333bd1df494",
                            "lessThan": "bbd6aa311a9f4dd17822c7557451458d3d2e980b",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c52661d60f636d17e26ad834457db333bd1df494",
                            "lessThan": "eaa96a8458f54d6cf0954242ab8b1df2a6fccafa",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c52661d60f636d17e26ad834457db333bd1df494",
                            "lessThan": "c39d0916da47d94909391876c9e5bd429ea7b1b9",
                            "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/target/target_core_fabric_configfs.c",
                        "drivers/usb/gadget/function/f_tcm.c",
                        "include/target/target_core_fabric.h"
                    ],
                    "versions": [
                        {
                            "version": "3.5",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "3.5",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.269",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.220",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.187",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.156",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.108",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.49",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.13",
                            "lessThanOrEqual": "7.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.3",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3",
                            "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": "3.5",
                                    "versionEndExcluding": "5.10.269"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.5",
                                    "versionEndExcluding": "5.15.220"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.5",
                                    "versionEndExcluding": "6.1.187"
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                                    "versionStartIncluding": "3.5",
                                    "versionEndExcluding": "7.2.3"
                                },
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.5",
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            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/c494c5562ca69b61a82f566e3b87a445d2c28929"
                },
                {
                    "url": "https://git.kernel.org/stable/c/c1f359d9a5efed458946063de65ddbeaacc4f165"
                },
                {
                    "url": "https://git.kernel.org/stable/c/178f59a0bccd3f66cdfa5184310f31a58b7257c4"
                },
                {
                    "url": "https://git.kernel.org/stable/c/ad6f0375d2e93a1d8c015463e5e92dfcb26e311b"
                },
                {
                    "url": "https://git.kernel.org/stable/c/2efbfd42441d3ef8137aff2d59e9835e1d5ae780"
                },
                {
                    "url": "https://git.kernel.org/stable/c/85aa61fedcb4eb13f3dc5db73f6dc359f41f5d95"
                },
                {
                    "url": "https://git.kernel.org/stable/c/bbd6aa311a9f4dd17822c7557451458d3d2e980b"
                },
                {
                    "url": "https://git.kernel.org/stable/c/eaa96a8458f54d6cf0954242ab8b1df2a6fccafa"
                },
                {
                    "url": "https://git.kernel.org/stable/c/c39d0916da47d94909391876c9e5bd429ea7b1b9"
                }
            ],
            "title": "usb: gadget: f_tcm: keep port count until LUN teardown completes",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}