{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-53057",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-53057"
  ],
  "published": "2024-11-19T17:20:22Z",
  "summary": "net/sched: stop qdisc_tree_reduce_backlog on TC_H_ROOT",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: stop qdisc_tree_reduce_backlog on TC_H_ROOT\n\nIn qdisc_tree_reduce_backlog, Qdiscs with major handle ffff: are assumed\nto be either root or ingress. This assumption is bogus since it's valid\nto create egress qdiscs with major handle ffff:\nBudimir Markovic found that for qdiscs like DRR that maintain an active\nclass list, it will cause a UAF with a dangling class pointer.\n\nIn 066a3b5b2346, the concern was to avoid iterating over the ingress\nqdisc since its parent is itself. The proper fix is to stop when parent\nTC_H_ROOT is reached because the only way to retrieve ingress is when a\nhierarchy which does not contain a ffff: major handle call into\nqdisc_lookup with TC_H_MAJ(TC_H_ROOT).\n\nIn the scenario where major ffff: is an egress qdisc in any of the tree\nlevels, the updates will also propagate to TC_H_ROOT, which then the\niteration must stop.\n\n\n net/sched/sch_api.c | 2 +-\n 1 file changed, 1 insertion(+), 1 deletion(-)",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-53057"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e7f9a6f97eb067599a74f3bcb6761976b0ed303e"
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    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:52:36Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerability is driven entirely through rtnetlink qdisc/class configuration (RTM_NEWQDISC, RTM_NEWTCLASS, RTM_DELTCLASS) on an AF_NETLINK socket, which requires local system access. Per kernel guidance, tc/netlink qdisc bugs are Local.\nAC:L - This is a deterministic logic error, not a race \u2014 the attacker simply creates an egress qdisc with major handle ffff:, adds a class, queues a packet, drains it, and deletes the class, all under full attacker control. The affected schedulers (HTB, DRR, QFQ, HFSC, ETS) are standard, widely built modules, so no unusual configuration is needed.\nPR:L - The tc paths require CAP_NET_ADMIN checked via netlink_net_capable() against the network namespace's owning user_ns, which any unprivileged user obtains with `unshare -Urn` on distributions enabling unprivileged user namespaces. The entire attack works inside that namespace against loopback.\nUI:N - The attacker performs every step \u2014 qdisc creation, class creation, packet injection on loopback, and class deletion \u2014 with no action from any other user or administrator.\nS:U - The use-after-free corrupts kernel heap memory and yields escalation within the same kernel security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed drr/htb/qfq class object remains reachable through the active list, and the dequeue path reads pointers and counters out of it after an attacker has reclaimed the slot, giving heap/kernel-pointer disclosure and, via the resulting control primitives, arbitrary memory read.\nI:H - The dangling list entry is written by list_del()/list_move_tail() \u2014 a classic unlink write-what-where \u2014 and drr_dequeue() calls cl->qdisc->ops->peek() through pointers read from the attacker-controlled freed object, giving control-flow hijack and arbitrary write suitable for local privilege escalation.\nA:H - Even without full exploitation, walking the active list into freed memory and dereferencing a stale class pointer causes an immediate kernel oops or panic, and the sequence can be triggered repeatedly at will."
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}