394 lines
19 KiB
JSON
394 lines
19 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-2025-38477",
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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": "2025-04-16T04:51:24.021Z",
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"datePublished": "2025-07-28T11:21:38.319Z",
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"dateUpdated": "2026-10-15T01:07:26.004Z"
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},
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"containers": {
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"cna": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:02:14.405Z"
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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\nnet/sched: sch_qfq: Fix race condition on qfq_aggregate\n\nA race condition can occur when 'agg' is modified in qfq_change_agg\n(called during qfq_enqueue) while other threads access it\nconcurrently. For example, qfq_dump_class may trigger a NULL\ndereference, and qfq_delete_class may cause a use-after-free.\n\nThis patch addresses the issue by:\n\n1. Moved qfq_destroy_class into the critical section.\n\n2. Added sch_tree_lock protection to qfq_dump_class and\nqfq_dump_class_stats."
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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 paths are reached via local RTM_NEWTCLASS/DELTCLASS/GETTCLASS netlink operations on a qfq qdisc raced against local packet transmission through that qdisc. No remote peer input is involved.\nAC:L - The attacker controls both sides of the race — one thread continuously transmits packets larger than the class lmax to force qfq_change_agg() from qfq_enqueue(), while another loops tc class show/change/delete — so the window can be hit reliably by repetition on an attacker-owned netdev.\nPR:L - tc class manipulation requires CAP_NET_ADMIN, but rtnetlink checks netlink_net_capable() against the netns user_ns, so an unprivileged user obtains it with `unshare -Urn` and can build the entire qfq/veth setup inside that namespace.\nUI:N - The attacker performs every step itself — creating the qdisc, the class, the filter, and both racing threads. No victim action is needed.\nS:U - The corruption is confined to kernel heap objects within the same kernel security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - qfq_dump_class()/qfq_dump_class_stats() read class_weight and lmax from an already-freed qfq_aggregate and copy them to userspace via netlink, and the broader use-after-free on a generic kmalloc slab object can be groomed into an arbitrary kernel-memory read primitive.\nI:H - The unlocked qfq_rm_from_agg()/qfq_update_agg()/qfq_destroy_agg() in qfq_delete_class() write into a concurrently freed aggregate (list unlink plus several field stores) and can double-free it, giving heap-spray-based write primitives suitable for control-flow hijack and privilege escalation.\nA:H - The race trivially produces a NULL pointer dereference on cl->agg, a use-after-free oops, a double free, or a divide-by-zero from corrupted num_classes/wsum, any of which panics the kernel."
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}
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]
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}
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"title": "net/sched: sch_qfq: Fix race condition on qfq_aggregate",
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