{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-98112",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-09-25T10:25:14.316Z",
        "datePublished": "2026-09-25T10:35:59.319Z",
        "dateUpdated": "2026-10-19T09:14:04.636Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-19T09:14:04.636Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix listener task lifetime on netdev events\n\nThe listener thread exits when its listening socket is shutdown. The\nnetdevice notifier shuts down the socket before calling kthread_stop(), so\nthe task_struct can be freed before kthread_stop() gets its reference.\n\nCreate the listener in a stopped state and hold an extra task_struct\nreference until kthread_stop_put() completes. Also stop and release\nlisteners before freeing their interface records during TCP teardown."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                        "baseScore": 7.8,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:L - The bug is kthread_stop() on an already-exited listener, reached from ksmbd_netdev_event(NETDEV_DOWN). That event comes from local rtnetlink link up/down. No SMB message carries attacker data to this path, so it is not remote.\nAC:L - The attacker starts the race: kernel_sock_shutdown() makes the listener exit before kthread_stop() takes its reference. The attacker can repeat it at will by toggling a same-named link. Each NETDEV_UP makes create_socket() start a new listener, so the narrow window can be retried as many times as needed.\nPR:L - ksmbd_netdev_event() matches iface names without checking the network namespace. An unprivileged user in `unshare -Urn` can down their own `lo`, or a veth named like a host interface, with only CAP_NET_ADMIN inside the user namespace, and so run the teardown of the host listener.\nUI:N - Nothing is needed from an admin or victim beyond ksmbd already running. The attacker sends the netlink link up/down requests themselves inside their own network namespace.\nS:U - This is memory corruption inside the kernel that leads to local privilege escalation or a crash within the same kernel authority. It does not cross a hypervisor or other separate security boundary.\nC:H - After the listener task_struct is freed and reallocated, kthread_stop() reads to_kthread(k) and kthread->result through a dangling pointer. The attacker can control the reclaimed object, which enables kernel memory disclosure.\nI:H - kthread_stop() writes to freed memory: it increments the refcount, does set_bit() on kthread->flags, then calls wake_up_process() and put_task_struct() on the stale task. This corrupts whatever object has reclaimed the memory and can be groomed into a write or an extra free.\nA:H - Using the freed task_struct/kthread in kthread_stop() under rtnl can cause an oops, a refcount underflow or a hang. Each trigger also tears down ksmbd's real host listener on port 445, so the server stops accepting connections."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/smb/server/transport_tcp.c"
                    ],
                    "versions": [
                        {
                            "version": "3316a8fc840d82fad5efcf76ad0ea3f76fdca209",
                            "lessThan": "40581f10c1e56238b157af5f260b8f9518a0cbc1",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "3316a8fc840d82fad5efcf76ad0ea3f76fdca209",
                            "lessThan": "a506290f59e1c6ce9ac0a13158640bb8fee93471",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/smb/server/transport_tcp.c"
                    ],
                    "versions": [
                        {
                            "version": "6.19",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.19",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.7",
                            "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": "6.19",
                                    "versionEndExcluding": "7.2.7"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.19",
                                    "versionEndExcluding": "7.3"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/40581f10c1e56238b157af5f260b8f9518a0cbc1"
                },
                {
                    "url": "https://git.kernel.org/stable/c/a506290f59e1c6ce9ac0a13158640bb8fee93471"
                }
            ],
            "title": "ksmbd: fix listener task lifetime on netdev events",
            "x_generator": {
                "engine": "bippy-1.2.0"
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        }
    }
}