CVE-2026-93247
N/AIn 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 ]---
No known exploitation, public exploit, or elevated probability at this time. Track for changes.
Exploitation likelihood
0.2%chance of exploitation in 30 days · 10th percentile
Impact if exploited
—CVSS · not scored
- No impact metrics
Proof of concept
No public PoC is currently catalogued.
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Vendor product assessments
Showing 32 of 278 vendor product statements; 246 omitted. Read the full vendor advisory.
kernel as a component of Red Hat Enterprise Linux 10 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/kernel
- none available: Fix deferred
kernel-64k-modules as a component of Red Hat Enterprise Linux 10 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/kernel-64k-modules
- none available: Fix deferred
kernel-devel as a component of Red Hat Enterprise Linux 10 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/kernel-devel
- none available: Fix deferred
kernel-rt-64k-debug-core as a component of Red Hat Enterprise Linux 10 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/kernel-rt-64k-debug-core
- none available: Fix deferred
kernel-rt-debug-devel as a component of Red Hat Enterprise Linux 10 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/kernel-rt-debug-devel
- none available: Fix deferred
kernel-tools-libs-devel as a component of Red Hat Enterprise Linux 10 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/kernel-tools-libs-devel
- none available: Fix deferred
python3-perf as a component of Red Hat Enterprise Linux 10 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/python3-perf
- none available: Fix deferred
kernel-64k-debug-modules-core as a component of Red Hat Enterprise Linux 9 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/kernel-64k-debug-modules-core
- none available: Fix deferred
kernel-core as a component of Red Hat Enterprise Linux 9 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/kernel-core
- none available: Fix deferred
kernel-debug-uki-virt-addons as a component of Red Hat Enterprise Linux 9 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/kernel-debug-uki-virt-addons
- none available: Fix deferred
kernel-rt-64k as a component of Red Hat Enterprise Linux 9 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/kernel-rt-64k
- none available: Fix deferred
kernel-rt-64k-devel as a component of Red Hat Enterprise Linux 9 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/kernel-rt-64k-devel
- none available: Fix deferred
kernel-rt-debug-devel-matched as a component of Red Hat Enterprise Linux 9 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/kernel-rt-debug-devel-matched
- none available: Fix deferred
kernel-rt-modules-extra as a component of Red Hat Enterprise Linux 9 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/kernel-rt-modules-extra
- none available: Fix deferred
kernel-zfcpdump-modules as a component of Red Hat Enterprise Linux 9 · known affected
Vendor assessment for this product only.
pkg:rpm/redhat/kernel-zfcpdump-modules
- none available: Fix deferred
openshift/ose-rhel-coreos-9 as a component of Red Hat OpenShift Container Platform 4 · known affected
Vendor assessment for this product only.
pkg:oci/ose-rhel-coreos-9?repository_url=registry.redhat.io/openshift/ose-rhel-coreos-9
- none available: Fix deferred
kernel as a component of Red Hat Enterprise Linux 6 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel
Red Hat · CVE-2026-93247 · Updated 2026-10-21T14:59:46+00:00kernel-doc as a component of Red Hat Enterprise Linux 6 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-doc
Red Hat · CVE-2026-93247 · Updated 2026-10-21T14:59:46+00:00perf as a component of Red Hat Enterprise Linux 6 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/perf
Red Hat · CVE-2026-93247 · Updated 2026-10-21T14:59:46+00:00kernel-debug as a component of Red Hat Enterprise Linux 7 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-debug
Red Hat · CVE-2026-93247 · Updated 2026-10-21T14:59:46+00:00kernel-rt as a component of Red Hat Enterprise Linux 7 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-rt
Red Hat · CVE-2026-93247 · Updated 2026-10-21T14:59:46+00:00kernel-rt-kvm as a component of Red Hat Enterprise Linux 7 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-rt-kvm
Red Hat · CVE-2026-93247 · Updated 2026-10-21T14:59:46+00:00kernel-tools-libs as a component of Red Hat Enterprise Linux 7 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-tools-libs
Red Hat · CVE-2026-93247 · Updated 2026-10-21T14:59:46+00:00kernel as a component of Red Hat Enterprise Linux 8 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel
Red Hat · CVE-2026-93247 · Updated 2026-10-21T14:59:46+00:00kernel-debug-core as a component of Red Hat Enterprise Linux 8 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-debug-core
Red Hat · CVE-2026-93247 · Updated 2026-10-21T14:59:46+00:00kernel-doc as a component of Red Hat Enterprise Linux 8 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-doc
Red Hat · CVE-2026-93247 · Updated 2026-10-21T14:59:46+00:00kernel-rt as a component of Red Hat Enterprise Linux 8 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-rt
Red Hat · CVE-2026-93247 · Updated 2026-10-21T14:59:46+00:00kernel-rt-debug-modules as a component of Red Hat Enterprise Linux 8 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-rt-debug-modules
Red Hat · CVE-2026-93247 · Updated 2026-10-21T14:59:46+00:00kernel-rt-modules-internal as a component of Red Hat Enterprise Linux 8 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-rt-modules-internal
Red Hat · CVE-2026-93247 · Updated 2026-10-21T14:59:46+00:00kernel-tools-libs-devel as a component of Red Hat Enterprise Linux 8 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-tools-libs-devel
Red Hat · CVE-2026-93247 · Updated 2026-10-21T14:59:46+00:00kernel-zfcpdump-modules-internal as a component of Red Hat Enterprise Linux 8 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:rpm/redhat/kernel-zfcpdump-modules-internal
Red Hat · CVE-2026-93247 · Updated 2026-10-21T14:59:46+00:00openshift/ose-rhel-coreos-8 as a component of Red Hat OpenShift Container Platform 4 · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
pkg:oci/ose-rhel-coreos-8?repository_url=registry.redhat.io/openshift/ose-rhel-coreos-8
Red Hat · CVE-2026-93247 · Updated 2026-10-21T14:59:46+00:00
References
Advisories
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93247.json Red Hat · CVE-2026-93247 · Updated 2026-10-21T14:59:46+00:00
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-86257 EUVD · EUVD-2026-86257
Technical & other
- https://git.kernel.org/stable/c/f02c01ccd12cb2b8a290077d4c90f29a6e109b16CVE record · Linux · Updated 2026-10-19T09:08:00.296Z
NVD · CVE-2026-93247 · Updated 2026-10-19T10:17:15.900 - https://git.kernel.org/stable/c/bbd262d2d750b67b15a5e1008d3848309c87e7a7CVE record · Linux · Updated 2026-10-19T09:08:00.296Z
NVD · CVE-2026-93247 · Updated 2026-10-19T10:17:15.900 - https://git.kernel.org/stable/c/18fda026a13c5abd6c1e0dfd3549f490b73378fbCVE record · Linux · Updated 2026-10-19T09:08:00.296Z
NVD · CVE-2026-93247 · Updated 2026-10-19T10:17:15.900 - https://git.kernel.org/stable/c/c3f63610bceaa182e4683b23cc47baf36b5f1496CVE record · Linux · Updated 2026-10-19T09:08:00.296Z
NVD · CVE-2026-93247 · Updated 2026-10-19T10:17:15.900 - https://git.kernel.org/stable/c/ee2135a14fb2a3e176149122764d293f0796b1ebCVE record · Linux · Updated 2026-10-19T09:08:00.296Z
NVD · CVE-2026-93247 · Updated 2026-10-19T10:17:15.900 - https://git.kernel.org/stable/c/59eecbe2f2f38d8f3e1104bd11da97f9a2c58998CVE record · Linux · Updated 2026-10-19T09:08:00.296Z
NVD · CVE-2026-93247 · Updated 2026-10-19T10:17:15.900 - https://access.redhat.com/security/cve/CVE-2026-93247 Red Hat · CVE-2026-93247 · Updated 2026-10-21T14:59:46+00:00
- https://bugzilla.redhat.com/show_bug.cgi?id=2540315 Red Hat · CVE-2026-93247 · Updated 2026-10-21T14:59:46+00:00
- https://www.cve.org/CVERecord?id=CVE-2026-93247 Red Hat · CVE-2026-93247 · Updated 2026-10-21T14:59:46+00:00
- https://nvd.nist.gov/vuln/detail/CVE-2026-93247 Red Hat · CVE-2026-93247 · Updated 2026-10-21T14:59:46+00:00
- https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93247.mbox Red Hat · CVE-2026-93247 · Updated 2026-10-21T14:59:46+00:00