{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-93247", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-17T16:02:15.096Z", "datePublished": "2026-09-24T15:51:04.897Z", "dateUpdated": "2026-10-19T09:08:00.296Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:08:00.296Z" }, "descriptions": [ { "lang": "en", "value": "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 ]---" } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "include/net/bluetooth/hci_core.h", "net/bluetooth/mgmt.c" ], "versions": [ { "version": "86f3dcd1f331cfd4fd7ec88906955134ec51afbe", "lessThan": "f02c01ccd12cb2b8a290077d4c90f29a6e109b16", "status": "affected", "versionType": "git" }, { "version": "7ce9bb0b95fc280e9212b8922590c492ca1d9c39", "lessThan": "bbd262d2d750b67b15a5e1008d3848309c87e7a7", "status": "affected", "versionType": "git" }, { "version": "16852eccbdfaf41a666705e3f8be55cf2864c5ca", "lessThan": "18fda026a13c5abd6c1e0dfd3549f490b73378fb", "status": "affected", "versionType": "git" }, { "version": "2935e556850e9c94d7a00adf14d3cd7fe406ac03", "lessThan": "c3f63610bceaa182e4683b23cc47baf36b5f1496", "status": "affected", "versionType": "git" }, { "version": "2935e556850e9c94d7a00adf14d3cd7fe406ac03", "lessThan": "ee2135a14fb2a3e176149122764d293f0796b1eb", "status": "affected", "versionType": "git" }, { "version": "2935e556850e9c94d7a00adf14d3cd7fe406ac03", "lessThan": "59eecbe2f2f38d8f3e1104bd11da97f9a2c58998", "status": "affected", "versionType": "git" }, { "version": "a351ff6b8ecca4229afaa0d98042bead8de64799", "status": "affected", "versionType": "git" }, { "version": "f8069f34c4c976786ded97498012225af87435d7", "status": "affected", "versionType": "git" }, { "version": "6.1.159", "lessThan": "6.1.188", "status": "affected", "versionType": "semver" }, { "version": "6.6.117", "lessThan": "6.6.157", "status": "affected", "versionType": "semver" }, { "version": "6.12.42", "lessThan": "6.12.110", "status": "affected", "versionType": "semver" }, { "version": "6.15.10", "lessThan": "6.16", "status": "affected", "versionType": "semver" }, { "version": "6.16.1", "lessThan": "6.17", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "include/net/bluetooth/hci_core.h", "net/bluetooth/mgmt.c" ], "versions": [ { "version": "6.17", "status": "affected" }, { "version": "0", "lessThan": "6.17", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.52", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.6", "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": "6.1.159", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.117", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.42", "versionEndExcluding": "6.12.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "6.18.52" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.2.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/f02c01ccd12cb2b8a290077d4c90f29a6e109b16" }, { "url": "https://git.kernel.org/stable/c/bbd262d2d750b67b15a5e1008d3848309c87e7a7" }, { "url": "https://git.kernel.org/stable/c/18fda026a13c5abd6c1e0dfd3549f490b73378fb" }, { "url": "https://git.kernel.org/stable/c/c3f63610bceaa182e4683b23cc47baf36b5f1496" }, { "url": "https://git.kernel.org/stable/c/ee2135a14fb2a3e176149122764d293f0796b1eb" }, { "url": "https://git.kernel.org/stable/c/59eecbe2f2f38d8f3e1104bd11da97f9a2c58998" } ], "title": "Bluetooth: mgmt: fix 'hdev->discovery.uuids' NULL dereference", "x_generator": { "engine": "bippy-1.2.0" } } } }