{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2025-40039",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2025-04-16T07:20:57.153Z",
        "datePublished": "2025-10-28T11:48:19.781Z",
        "dateUpdated": "2026-07-30T05:59:58.322Z"
    },
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                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-07-30T05:59:58.322Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: Fix race condition in RPC handle list access\n\nThe 'sess->rpc_handle_list' XArray manages RPC handles within a ksmbd\nsession. Access to this list is intended to be protected by\n'sess->rpc_lock' (an rw_semaphore). However, the locking implementation was\nflawed, leading to potential race conditions.\n\nIn ksmbd_session_rpc_open(), the code incorrectly acquired only a read lock\nbefore calling xa_store() and xa_erase(). Since these operations modify\nthe XArray structure, a write lock is required to ensure exclusive access\nand prevent data corruption from concurrent modifications.\n\nFurthermore, ksmbd_session_rpc_method() accessed the list using xa_load()\nwithout holding any lock at all. This could lead to reading inconsistent\ndata or a potential use-after-free if an entry is concurrently removed and\nthe pointer is dereferenced.\n\nFix these issues by:\n1. Using down_write() and up_write() in ksmbd_session_rpc_open()\n   to ensure exclusive access during XArray modification, and ensuring\n   the lock is correctly released on error paths.\n2. Adding down_read() and up_read() in ksmbd_session_rpc_method()\n   to safely protect the lookup."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                        "baseScore": 8.8,
                        "baseSeverity": "HIGH"
                    }
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/smb/server/mgmt/user_session.c"
                    ],
                    "versions": [
                        {
                            "version": "a4348710a7267705b75692dc1a000920481d1d92",
                            "lessThan": "69674b029002b1d90b655f014bdf64f404efa54d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "b685757c7b08d5073046fb379be965fd6c06aafc",
                            "lessThan": "6b615a8fb3af0baf8126cde3d4fee97d57222ffc",
                            "status": "affected",
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                            "status": "affected",
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                            "lessThan": "6bd7e0e55dcea2cf0d391bbc21c2eb069b4be3e1",
                            "status": "affected",
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                            "status": "affected",
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                        },
                        {
                            "version": "1f485b54d04a920723984062c912174330a05178",
                            "status": "affected",
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                        },
                        {
                            "version": "052b41ef2abe274f068e892aee81406f11bd1f3a",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5.15.145",
                            "lessThan": "5.16",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/smb/server/mgmt/user_session.c"
                    ],
                    "versions": [
                        {
                            "version": "6.3",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.3",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.123",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.53",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.17.3",
                            "lessThanOrEqual": "6.17.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
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                    "nodes": [
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                            "negate": false,
                            "cpeMatch": [
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            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/69674b029002b1d90b655f014bdf64f404efa54d"
                },
                {
                    "url": "https://git.kernel.org/stable/c/6b615a8fb3af0baf8126cde3d4fee97d57222ffc"
                },
                {
                    "url": "https://git.kernel.org/stable/c/5cc679ba0f4505936124cd4179ba66bb0a4bd9f3"
                },
                {
                    "url": "https://git.kernel.org/stable/c/6bd7e0e55dcea2cf0d391bbc21c2eb069b4be3e1"
                },
                {
                    "url": "https://git.kernel.org/stable/c/305853cce379407090a73b38c5de5ba748893aee"
                }
            ],
            "title": "ksmbd: Fix race condition in RPC handle list access",
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