343 lines
17 KiB
JSON
343 lines
17 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-2024-53164",
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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": "2024-11-19T17:17:25.004Z",
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"datePublished": "2024-12-27T13:38:43.407Z",
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"dateUpdated": "2026-10-15T00:58:52.239Z"
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},
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"containers": {
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"cna": {
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:44:12.310Z"
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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: fix ordering of qlen adjustment\n\nChanges to sch->q.qlen around qdisc_tree_reduce_backlog() need to happen\n_before_ a call to said function because otherwise it may fail to notify\nparent qdiscs when the child is about to become empty."
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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 qdisc hierarchy (cake/choke leaf under a classful parent such as DRR/QFQ/HFSC) is built through rtnetlink RTM_NEWQDISC/RTM_NEWTCLASS and triggered by locally injected traffic on a local device, matching the tc/netlink qdisc local vector.\nAC:L - The attacker fully controls every precondition — the qdisc topology, the cake memlimit / choke limit that forces the drop, and the packet injection — making the miscounted qlen and the resulting stale active class deterministic with no race to win.\nPR:L - tc configuration requires only CAP_NET_ADMIN over the target netns, checked via namespace-relative netlink_net_capable(); an unprivileged user obtains it with `unshare -Urn` and uses the always-present `lo` device.\nUI:N - The attacker performs all steps — creating the qdisc tree, sending packets, and deleting the class — with no action by any other user.\nS:U - The corruption and its consequences remain within the kernel's own security authority; this is standard local kernel privilege escalation with no crossing into a hypervisor or IOMMU boundary.\nC:H - The missed qlen_notify() leaves a freed class linked in the parent's active list/rbtree, and the resulting use-after-free lets the attacker reclaim the slab object and read back attacker-shaped kernel memory, yielding arbitrary kernel read.\nI:H - The same use-after-free provides both a hijackable indirect call through cl->qdisc->ops->peek and unlink-style writes via list_del(&cl->alist)/rb_erase(&cl->el_node), giving control-flow hijack and arbitrary write.\nA:H - The stale class causes an immediate use-after-free oops, and even absent full exploitation the permanently non-dequeuing qdisc wedges all transmission on the device, a complete availability loss."
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}
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]
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}
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],
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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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"net/sched/sch_cake.c",
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"net/sched/sch_choke.c"
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"net/sched/sch_choke.c"
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"lessThanOrEqual": "5.4.*",
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"version": "6.13",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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