CVE-2026-93247
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: mgmt: fix 'hdev->discovery.uuids' NULL dereference 'uuid_count' member of struct 'discovery_state' is assigned and read without any locks, so there is a chance of situation when uuid_count != 0, but uuids is NULL and there will be NULL pointer dereference. Possible race: 'hci_update_passive_scan_sync' 'hci_discovery_filter_clear' hdev->discovery.uuid_count = 0; <----------------------preempted-----------------------------> 'start_service_discovery' // Set uuid_count to value != 0 hdev->discovery.uuid_count = uuid_count; hdev->discovery.uuids = kmemdup(...); <----------------------preempted-----------------------------> spin_lock(&hdev->discovery.lock); kfree(hdev->discovery.uuids); hdev->discovery.uuids = NULL; spin_unlock(&hdev->discovery.lock); Now uuids == NULL and uuid_count != 0. So 'mgmt_device_found' -> 'is_filter_match' -> 'eir_has_uuids' receives non consistent discovery state, where NULL dereference of uuids happens. To fix it let's add discovery.lock around every read/write of uuid_count, uuids pair of struct members. It is also important to assign uuid_count value only after success kmemdup() allocation in start_service_discovery(), otherwise uuids is NULL, because kmemdup failed, but uuid_count is already assigned to non zero value. The following panic happens: [ ] ------------[ cut here ]------------ [ ] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 [ ] Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP [ ] CPU: 0 PID: 15056 Comm: kworker/u9:2 [ ] Workqueue: hci0 hci_rx_work [ ] pstate: 10400009 (nzcV daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ ] pc : eir_has_uuids+0x2d8/0x590 [ ] lr : is_filter_match+0x258/0x320 ... [ ] Call trace: [ ] eir_has_uuids+0x2d8/0x590 [ ] is_filter_match+0x258/0x320 [ ] mgmt_device_found+0x5b0/0xafc [ ] process_adv_report.part.0+0x8c8/0xf14 [ ] hci_le_adv_report_evt+0x338/0x3f0 [ ] hci_le_meta_evt+0x1f0/0x4c8 [ ] hci_event_packet+0x440/0xc9c [ ] hci_rx_work+0x44c/0xaf8 [ ] process_one_work+0x54c/0x103c [ ] worker_thread+0x6c4/0x10c4 [ ] kthread+0x274/0x2ec [ ] ret_from_fork+0x10/0x20 [ ] Code: 14000004 91004021 eb14003f 54000180 (f9400024) [ ] ---[ end trace 0000000000000000 ]---
View original CVE JSON
{
"id": "CVE-2026-93247",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-09-24T16:17:20.803",
"lastModified": "2026-10-19T10:17:15.900",
"vulnStatus": "Received",
"cveTags": [],
"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": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"include/net/bluetooth/hci_core.h",
"net/bluetooth/mgmt.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "86f3dcd1f331cfd4fd7ec88906955134ec51afbe",
"lessThan": "f02c01ccd12cb2b8a290077d4c90f29a6e109b16",
"versionType": "git",
"status": "affected"
},
{
"version": "7ce9bb0b95fc280e9212b8922590c492ca1d9c39",
"lessThan": "bbd262d2d750b67b15a5e1008d3848309c87e7a7",
"versionType": "git",
"status": "affected"
},
{
"version": "16852eccbdfaf41a666705e3f8be55cf2864c5ca",
"lessThan": "18fda026a13c5abd6c1e0dfd3549f490b73378fb",
"versionType": "git",
"status": "affected"
},
{
"version": "2935e556850e9c94d7a00adf14d3cd7fe406ac03",
"lessThan": "c3f63610bceaa182e4683b23cc47baf36b5f1496",
"versionType": "git",
"status": "affected"
},
{
"version": "2935e556850e9c94d7a00adf14d3cd7fe406ac03",
"lessThan": "ee2135a14fb2a3e176149122764d293f0796b1eb",
"versionType": "git",
"status": "affected"
},
{
"version": "2935e556850e9c94d7a00adf14d3cd7fe406ac03",
"lessThan": "59eecbe2f2f38d8f3e1104bd11da97f9a2c58998",
"versionType": "git",
"status": "affected"
},
{
"version": "a351ff6b8ecca4229afaa0d98042bead8de64799",
"versionType": "git",
"status": "affected"
},
{
"version": "f8069f34c4c976786ded97498012225af87435d7",
"versionType": "git",
"status": "affected"
},
{
"version": "6.1.159",
"lessThan": "6.1.188",
"versionType": "semver",
"status": "affected"
},
{
"version": "6.6.117",
"lessThan": "6.6.157",
"versionType": "semver",
"status": "affected"
},
{
"version": "6.12.42",
"lessThan": "6.12.110",
"versionType": "semver",
"status": "affected"
},
{
"version": "6.15.10",
"lessThan": "6.16",
"versionType": "semver",
"status": "affected"
},
{
"version": "6.16.1",
"lessThan": "6.17",
"versionType": "semver",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"include/net/bluetooth/hci_core.h",
"net/bluetooth/mgmt.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "6.17",
"status": "affected"
},
{
"version": "0",
"lessThan": "6.17",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.188",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.157",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.110",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.52",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2.6",
"lessThanOrEqual": "7.2.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {},
"references": [
{
"url": "https://git.kernel.org/stable/c/18fda026a13c5abd6c1e0dfd3549f490b73378fb",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/59eecbe2f2f38d8f3e1104bd11da97f9a2c58998",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/bbd262d2d750b67b15a5e1008d3848309c87e7a7",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/c3f63610bceaa182e4683b23cc47baf36b5f1496",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/ee2135a14fb2a3e176149122764d293f0796b1eb",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/f02c01ccd12cb2b8a290077d4c90f29a6e109b16",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}