414 lines
21 KiB
JSON
414 lines
21 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2024-39495",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-06-25T14:23:23.751Z",
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"datePublished": "2024-07-12T12:20:31.022Z",
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"dateUpdated": "2026-08-05T11:33:44.931Z"
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},
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngreybus: Fix use-after-free bug in gb_interface_release due to race condition.\n\nIn gb_interface_create, &intf->mode_switch_completion is bound with\ngb_interface_mode_switch_work. Then it will be started by\ngb_interface_request_mode_switch. Here is the relevant code.\nif (!queue_work(system_long_wq, &intf->mode_switch_work)) {\n\t...\n}\n\nIf we call gb_interface_release to make cleanup, there may be an\nunfinished work. This function will call kfree to free the object\n\"intf\". However, if gb_interface_mode_switch_work is scheduled to\nrun after kfree, it may cause use-after-free error as\ngb_interface_mode_switch_work will use the object \"intf\".\nThe possible execution flow that may lead to the issue is as follows:\n\nCPU0 CPU1\n\n | gb_interface_create\n | gb_interface_request_mode_switch\ngb_interface_release |\nkfree(intf) (free) |\n | gb_interface_mode_switch_work\n | mutex_lock(&intf->mutex) (use)\n\nFix it by canceling the work before kfree."
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}
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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{
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"lang": "en",
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"value": "AV:L - The attacker-controlled side of the race is the FW_MGMT_IOC_MODE_SWITCH ioctl on the /dev/gb-fw-mgmt-N character device (drivers/staging/greybus/fw-management.c:503), the sole caller of gb_interface_request_mode_switch(). Greybus is a local bus (USB/UART/serdev transport), not remotely reachable, so exploitation requires local access to the system.\nAC:L - The attacker directly controls the work-queueing side via the ioctl and can retry it in a tight loop indefinitely, while the free side (interface refcount drop via module removal / SVC teardown) can be induced repeatedly by hot-unplug or the 2-second mode-switch timeout path that calls gb_interface_deactivate(). Heap grooming of the ~1KB gb_interface allocation is standard, so the attacker creates and wins the race himself rather than depending on conditions outside his control.\nPR:L - fw_mgmt_ioctl() and fw_mgmt_ioctl_unlocked() contain no capable() or CAP_* check at all; the only gate is the permission on the /dev/gb-fw-mgmt-N node, which on greybus-based embedded/mobile deployments is routinely granted to a non-root firmware-management service or group. An unprivileged user holding a descriptor to that node can drive the entire path.\nUI:N - No victim action is needed — the attacker issues the ioctl himself, and the freeing side is driven by SVC module-removed events or the mode-switch timeout that the attacker can provoke. No file must be opened and no filesystem mounted by another user.\nS:U - The use-after-free corrupts kernel heap memory and is exploited within the same kernel security authority; there is no hypervisor, IOMMU, or sandbox boundary crossed. This is standard local kernel privilege escalation.\nC:H - The freed gb_interface can be reclaimed and sprayed by the attacker, after which gb_interface_mode_switch_work() reads intf->control, intf->enabled and walks intf->bundles, giving a controlled-pointer dereference usable as an arbitrary kernel-memory read primitive. Full disclosure of kernel memory, including credentials and KASLR-defeating pointers, is achievable.\nI:H - mutex_lock(&intf->mutex) on the freed object writes into attacker-controlled reclaimed memory, and gb_bundle_destroy() iterating the stale intf->bundles list performs list-unlink writes through attacker-supplied pointers. These are classic UAF write primitives that can be escalated to control-flow hijack and full kernel compromise.\nA:H - Even without successful reclaim, the work item dereferences and takes a mutex on freed memory, producing a kernel oops or panic. Any use-after-free of this kind reliably crashes the system, and the ioctl can be repeated to trigger it at will."
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}
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