330 lines
17 KiB
JSON
330 lines
17 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveMetadata": {
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"cveId": "CVE-2024-35879",
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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": "2024-05-17T13:50:33.111Z",
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"datePublished": "2024-05-19T08:34:36.450Z",
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"dateUpdated": "2026-08-05T11:30:36.996Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:30:36.996Z"
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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\nof: dynamic: Synchronize of_changeset_destroy() with the devlink removals\n\nIn the following sequence:\n 1) of_platform_depopulate()\n 2) of_overlay_remove()\n\nDuring the step 1, devices are destroyed and devlinks are removed.\nDuring the step 2, OF nodes are destroyed but\n__of_changeset_entry_destroy() can raise warnings related to missing\nof_node_put():\n ERROR: memory leak, expected refcount 1 instead of 2 ...\n\nIndeed, during the devlink removals performed at step 1, the removal\nitself releasing the device (and the attached of_node) is done by a job\nqueued in a workqueue and so, it is done asynchronously with respect to\nfunction calls.\nWhen the warning is present, of_node_put() will be called but wrongly\ntoo late from the workqueue job.\n\nIn order to be sure that any ongoing devlink removals are done before\nthe of_node destruction, synchronize the of_changeset_destroy() with the\ndevlink removals."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The vulnerable sequence is reached through local device-tree overlay teardown (driver unbind via sysfs, PCI/FPGA hot-unplug handling, DLPAR), not through any network or remote protocol input. No remote peer data reaches drivers/of/dynamic.c.\nAC:L - The devlink removal job is queued asynchronously and of_platform_depopulate() returns immediately before of_overlay_remove() runs, so the outstanding-reference condition occurs reliably (the reporter and testers hit it consistently), and the teardown can be repeated in a loop via unbind/rebind cycles.\nPR:L - No capability check guards the racy path; entry is device removal/unbind, which on embedded and hotplug-capable deployments is initiated by device events or low-privileged management paths rather than gated authentication. Choosing the higher-severity option where the privilege boundary is deployment-dependent.\nUI:N - The overlay teardown is initiated by the attacker's own action (unbind/hot-unplug) or by an autonomous device event; no separate victim needs to perform any operation.\nS:U - The corrupted objects (struct device_node, kobject refcounts, kernel heap) all live within the kernel's own security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:H - When a leaked child node's parent device_node has already been freed, of_node_release()'s %pOF print dereferences the freed parent and its freed full_name pointer, rendering reclaimed heap contents into the kernel log — a use-after-free read of attacker-influenceable memory.\nI:H - The same path performs kobject_get()/refcount_inc() on the freed parent object, writing into memory that can be reclaimed by an attacker-sprayed allocation during the asynchronous workqueue window, giving a use-after-free write primitive.\nA:H - Every affected teardown permanently leaks device_node memory plus its properties, and the resulting refcount-0 nodes left in fwnode link lists and dangling parent pointers produce refcount_t warnings and freed-memory dereferences that oops (and panic under panic_on_warn); repeated hot-unplug cycles drive unbounded memory exhaustion."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/of/dynamic.c"
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],
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