{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-74528",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-08-15T05:44:03.912Z",
        "datePublished": "2026-08-15T12:27:44.181Z",
        "dateUpdated": "2026-08-17T05:48:17.804Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-17T05:48:17.804Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: hold conn in hci_past_sync() callback\n\nAvoids giving freed pointers to hci_conn_valid(), which kmalloc may have\nreused.\n\nHold refcount to avoid that."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                        "baseScore": 8,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:A - The bug is in Bluetooth LE PAST handling reached via ISO socket bind() rebind; exploitation requires an active LE connection to an adjacent peer and the freeing race is routinely won by concurrent local disconnects or a remote BLE link teardown, matching the CNA Bluetooth-adjacent threat model for phones and laptops in radio range.\nAC:L - An attacker controls both sides of the race by calling bind() to queue hci_past_sync() while concurrently closing the ISO socket or tearing down the looked-up LE link; repeated attempts can reliably free hci_conn objects before the hci_cmd_sync work callback runs without uncontrollable layout or timing dependencies.\nPR:L - Once the ISO socket layer is active (typically enabled by bluetoothd at boot), any unprivileged local user can open AF_BLUETOOTH SOCK_SEQPACKET ISO sockets and invoke the vulnerable bind() rebind path without CAP_NET_ADMIN; Bluetooth sockets are restricted to init_net and are not available through user namespaces.\nUI:N - Exploitation is driven entirely by the attacker's own socket operations and coordinated disconnects; no action by another user or administrator (pairing prompts, mounting, or opening files) is required beyond normal Bluetooth being enabled on the host.\nS:U - The use-after-free corrupts kernel heap objects and enables standard local kernel privilege escalation within the same security authority; it does not cross VM, hypervisor, or IOMMU boundaries.\nC:H - Without refcounting, freed hci_conn pointers are passed to hci_conn_valid(); if kmalloc reuses the slab for another hci_conn the check can succeed and the callback reads handle, sync_handle, and iso_qos fields from attacker-influenced freed/reused memory, giving UAF-based kernel information disclosure.\nI:H - Slab reuse of the freed hci_conn lets an attacker shape heap contents so stale pointer dereferences and subsequent HCI PAST commands operate on attacker-controlled data, providing the memory corruption and arbitrary-write primitives typical of kernel use-after-free exploitation.\nA:H - Use-after-free on hci_conn structures in hci_cmd_sync work can cause KASAN slab-use-after-free reports, kernel oopses, or panics when freed memory is reused or corrupted, and misdirected PAST HCI commands can additionally disrupt or wedge Bluetooth connectivity on the host."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/bluetooth/hci_sync.c"
                    ],
                    "versions": [
                        {
                            "version": "d3413703d5f8b7d1e6f514f9440ed5da1bc30796",
                            "lessThan": "e6792adef614b389141b142e30ee549e4a47dd7d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "d3413703d5f8b7d1e6f514f9440ed5da1bc30796",
                            "lessThan": "abf9753edf3f88282c44a605f3945d8d4f8dd86c",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/bluetooth/hci_sync.c"
                    ],
                    "versions": [
                        {
                            "version": "6.19",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.19",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.8",
                            "lessThanOrEqual": "7.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2",
                            "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": "7.1.8"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.19",
                                    "versionEndExcluding": "7.2"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/e6792adef614b389141b142e30ee549e4a47dd7d"
                },
                {
                    "url": "https://git.kernel.org/stable/c/abf9753edf3f88282c44a605f3945d8d4f8dd86c"
                }
            ],
            "title": "Bluetooth: hci_sync: hold conn in hci_past_sync() callback",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}