Bluetooth: mgmt: fix 'hdev->discovery.uuids' NULL dereference
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 0000000000000
CVE-2026-93247
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-93247
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"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"
}
],
"programFiles": [
"include/net/bluetooth/hci_core.h",
"net/bluetooth/mgmt.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.17"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.17",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"include/net/bluetooth/hci_core.h",
"net/bluetooth/mgmt.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-93247
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #37942 · Revision 1
- Added to Heist Feed
- Publisher date