{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2025-38092",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2025-04-16T04:51:23.983Z",
        "datePublished": "2025-07-02T14:43:30.776Z",
        "dateUpdated": "2026-08-05T11:59:27.724Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-05T11:59:27.724Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: use list_first_entry_or_null for opinfo_get_list()\n\nThe list_first_entry() macro never returns NULL.  If the list is\nempty then it returns an invalid pointer.  Use list_first_entry_or_null()\nto check if the list is empty."
                }
            ],
            "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"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:N - ksmbd is the in-kernel SMB server; the vulnerable path is driven entirely by remote SMB2 CREATE, LOCK and CLOSE requests arriving on TCP/445 from a remote client. No local access is required.\nAC:L - The attacker controls both sides of the race by issuing concurrent SMB2 CREATE/LOCK and CLOSE requests on multiple connections against the same file, and the window is actively widened because down_read() in opinfo_get_list() blocks behind the racing opinfo_del() down_write() that empties the list.\nPR:L - Reaching smb_grant_oplock()/smb_break_all_oplock() requires an established SMB2 session, a tree connect and open file handles, so a valid (even low-privilege or guest-mapped) SMB account is needed; this is not a pre-authentication code path.\nUI:N - The attacker drives every step from its own SMB connections — opening handles with oplocks/leases and closing them concurrently. No action by any other user or administrator is needed.\nS:U - The type confusion corrupts kernel heap memory belonging to the ksmbd subsystem within the same kernel security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:H - The fake oplock_info causes reads through attacker-timed wild pointers — opinfo->conn resolves to an rwsem waiter on another task's kernel stack and o_lease to an arbitrary kernel pointer — and such heap type confusion is leverageable into arbitrary kernel memory disclosure.\nI:H - atomic_inc_not_zero() performs a real RMW write onto the upper half of ksmbd_inode->m_hash.pprev, corrupting a kernel pointer that hlist_del_init() later writes through, and follow-on oplock_break()/opinfo_put() paths add out-of-bounds wait-queue list writes and kfree() of interior pointers — classic type confusion promotable to a write primitive.\nA:H - Dereferencing and atomically modifying a bogus pointer derived from the list head, plus spinlock/wait-queue operations past the end of the kmalloc'd ksmbd_inode, reliably produce slab corruption, oops or panic, taking down the file server host."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/smb/server/oplock.c"
                    ],
                    "versions": [
                        {
                            "version": "296cb5457cc6f4a754c4ae29855f8a253d52bcc6",
                            "lessThan": "c78abb646ff823e7d22faad4cc0703d4484da9e8",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "d54ab1520d43e95f9b2e22d7a05fc9614192e5a5",
                            "lessThan": "334da674b25fdb7a1a4d4b89dcd7795144fc7e11",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "d73686367ad68534257cd88a36ca3c52cb8b81d8",
                            "lessThan": "cb7e06e9736d73007dc8dab7b353733bb37df86b",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "18b4fac5ef17f77fed9417d22210ceafd6525fc7",
                            "lessThan": "10379171f346e6f61d30d9949500a8de4336444a",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/smb/server/oplock.c"
                    ],
                    "versions": [
                        {
                            "version": "6.6.88",
                            "lessThan": "6.6.93",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.25",
                            "lessThan": "6.12.32",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.14.4",
                            "lessThan": "6.14.10",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.6.88",
                                    "versionEndExcluding": "6.6.93"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.12.25",
                                    "versionEndExcluding": "6.12.32"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.14.4",
                                    "versionEndExcluding": "6.14.10"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/c78abb646ff823e7d22faad4cc0703d4484da9e8"
                },
                {
                    "url": "https://git.kernel.org/stable/c/334da674b25fdb7a1a4d4b89dcd7795144fc7e11"
                },
                {
                    "url": "https://git.kernel.org/stable/c/cb7e06e9736d73007dc8dab7b353733bb37df86b"
                },
                {
                    "url": "https://git.kernel.org/stable/c/10379171f346e6f61d30d9949500a8de4336444a"
                }
            ],
            "title": "ksmbd: use list_first_entry_or_null for opinfo_get_list()",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}