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CVE-2026-93247: Linux

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CVSS

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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    Описание

    Оригинално описание

    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+0x258/0x

    Засегнати продукти

    • Linux Linux: 86f3dcd1f331cfd4fd7ec88906955134ec51afbe преди f02c01ccd12cb2b8a290077d4c90f29a6e109b16; 7ce9bb0b95fc280e9212b8922590c492ca1d9c39 преди bbd262d2d750b67b15a5e1008d3848309c87e7a7; 16852eccbdfaf41a666705e3f8be55cf2864c5ca преди 18fda026a13c5abd6c1e0dfd3549f490b73378fb; 2935e556850e9c94d7a00adf14d3cd7fe406ac03 преди c3f63610bceaa182e4683b23cc47baf36b5f1496; 2935e556850e9c94d7a00adf14d3cd7fe406ac03 преди ee2135a14fb2a3e176149122764d293f0796b1eb; 2935e556850e9c94d7a00adf14d3cd7fe406ac03 преди 59eecbe2f2f38d8f3e1104bd11da97f9a2c58998; a351ff6b8ecca4229afaa0d98042bead8de64799; f8069f34c4c976786ded97498012225af87435d7; 6.1.159 преди 6.1.188; 6.6.117 преди 6.6.157; 6.12.42 преди 6.12.110; 6.15.10 преди 6.16; 6.16.1 преди 6.17
    • Linux Linux: 6.17; преди 6.17; 6.1.188 до 6.1.*; 6.6.157 до 6.6.*; 6.12.110 до 6.12.*; 6.18.52 до 6.18.*; 7.2.6 до 7.2.*; от 7.3 нататък

    История

    • 24 септември 2026 Публикувано

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    Първоизточници

    CVE-2026-93247: Linux | freedomonline.bg