{"id":"CVE-2026-93247","revision":"3ee567021f634d8a811f36e014af78d0","records":[{"revision":"3ee567021f634d8a811f36e014af78d0","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-93247","aliases":[],"title":"Bluetooth: mgmt: fix 'hdev->discovery.uuids' NULL dereference","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: mgmt: fix 'hdev->discovery.uuids' NULL dereference\n\n'uuid_count' member of struct 'discovery_state' is assigned and read\nwithout any locks, so there is a chance of situation when\nuuid_count != 0, but uuids is NULL and there will be NULL pointer\ndereference.\n\nPossible race:\n'hci_update_passive_scan_sync'\n  'hci_discovery_filter_clear'\n    hdev->discovery.uuid_count = 0;\n      <----------------------preempted----------------------------->\n                        'start_service_discovery'\n                          // Set uuid_count to value != 0\n                          hdev->discovery.uuid_count = uuid_count;\n                          hdev->discovery.uuids = kmemdup(...);\n      <----------------------preempted----------------------------->\n    spin_lock(&hdev->discovery.lock);\n    kfree(hdev->discovery.uuids);\n    hdev->discovery.uuids = NULL;\n    spin_unlock(&hdev->discovery.lock);\n\nNow uuids == NULL and uuid_count != 0.\nSo 'mgmt_device_found' -> 'is_filter_match' -> 'eir_has_uuids' receives\nnon consistent discovery state, where NULL dereference of uuids happens.\n\nTo fix it let's add discovery.lock around every read/write of uuid_count,\nuuids pair of struct members. It is also important to assign uuid_count\nvalue only after success kmemdup() allocation in\nstart_service_discovery(), otherwise uuids is NULL, because kmemdup failed,\nbut uuid_count is already assigned to non zero value.\n\nThe following panic happens:\n\n[ ] ------------[ cut here ]------------\n[ ] Unable to handle kernel NULL pointer dereference at virtual\naddress 0000000000000000\n[ ] Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP\n[ ] CPU: 0 PID: 15056 Comm: kworker/u9:2\n[ ] Workqueue: hci0 hci_rx_work\n[ ] pstate: 10400009 (nzcV daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n[ ] pc : eir_has_uuids+0x2d8/0x590\n[ ] lr : is_filter_match+0x258/0x320\n...\n[ ] Call trace:\n[ ]  eir_has_uuids+0x2d8/0x590\n[ ]  is_filter_match+0x258/0x320\n[ ]  mgmt_device_found+0x5b0/0xafc\n[ ]  process_adv_report.part.0+0x8c8/0xf14\n[ ]  hci_le_adv_report_evt+0x338/0x3f0\n[ ]  hci_le_meta_evt+0x1f0/0x4c8\n[ ]  hci_event_packet+0x440/0xc9c\n[ ]  hci_rx_work+0x44c/0xaf8\n[ ]  process_one_work+0x54c/0x103c\n[ ]  worker_thread+0x6c4/0x10c4\n[ ]  kthread+0x274/0x2ec\n[ ]  ret_from_fork+0x10/0x20\n[ ] Code: 14000004 91004021 eb14003f 54000180 (f9400024)\n[ ] ---[ end trace 0000000000000000 ]---","state":0,"publishedAt":"2026-09-24T15:51:04.897+00:00","modifiedAt":"2026-10-19T09:08:00.296+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"include/net/bluetooth/hci_core.h\",\n                        \"net/bluetooth/mgmt.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"86f3dcd1f331cfd4fd7ec88906955134ec51afbe\",\n                            \"lessThan\": \"f02c01ccd12cb2b8a290077d4c90f29a6e109b16\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7ce9bb0b95fc280e9212b8922590c492ca1d9c39\",\n                            \"lessThan\": \"bbd262d2d750b67b15a5e1008d3848309c87e7a7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"16852eccbdfaf41a666705e3f8be55cf2864c5ca\",\n                            \"lessThan\": \"18fda026a13c5abd6c1e0dfd3549f490b73378fb\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2935e556850e9c94d7a00adf14d3cd7fe406ac03\",\n                            \"lessThan\": \"c3f63610bceaa182e4683b23cc47baf36b5f1496\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2935e556850e9c94d7a00adf14d3cd7fe406ac03\",\n                            \"lessThan\": \"ee2135a14fb2a3e176149122764d293f0796b1eb\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2935e556850e9c94d7a00adf14d3cd7fe406ac03\",\n                            \"lessThan\": \"59eecbe2f2f38d8f3e1104bd11da97f9a2c58998\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a351ff6b8ecca4229afaa0d98042bead8de64799\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f8069f34c4c976786ded97498012225af87435d7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6.1.159\",\n                            \"lessThan\": \"6.1.188\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.117\",\n                            \"lessThan\": \"6.6.157\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.42\",\n                            \"lessThan\": \"6.12.110\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.15.10\",\n                            \"lessThan\": \"6.16\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.16.1\",\n                            \"lessThan\": \"6.17\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"include/net/bluetooth/hci_core.h\",\n                        \"net/bluetooth/mgmt.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.17\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.17\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.110\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.52\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.6\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/f02c01ccd12cb2b8a290077d4c90f29a6e109b16","https://git.kernel.org/stable/c/bbd262d2d750b67b15a5e1008d3848309c87e7a7","https://git.kernel.org/stable/c/18fda026a13c5abd6c1e0dfd3549f490b73378fb","https://git.kernel.org/stable/c/c3f63610bceaa182e4683b23cc47baf36b5f1496","https://git.kernel.org/stable/c/ee2135a14fb2a3e176149122764d293f0796b1eb","https://git.kernel.org/stable/c/59eecbe2f2f38d8f3e1104bd11da97f9a2c58998"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-93247","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-93247","identifiers":["CVE-2026-93247"]},"retained":false,"historicalAffected":[]}],"coverage":[]}