{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-23413",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-23413"
  ],
  "published": "2026-04-02T11:41:16Z",
  "summary": "clsact: Fix use-after-free in init/destroy rollback asymmetry",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nclsact: Fix use-after-free in init/destroy rollback asymmetry\n\nFix a use-after-free in the clsact qdisc upon init/destroy rollback asymmetry.\nThe latter is achieved by first fully initializing a clsact instance, and\nthen in a second step having a replacement failure for the new clsact qdisc\ninstance. clsact_init() initializes ingress first and then takes care of the\negress part. This can fail midway, for example, via tcf_block_get_ext(). Upon\nfailure, the kernel will trigger the clsact_destroy() callback.\n\nCommit 1cb6f0bae504 (\"bpf: Fix too early release of tcx_entry\") details the\nway how the transition is happening. If tcf_block_get_ext on the q->ingress_block\nends up failing, we took the tcx_miniq_inc reference count on the ingress\nside, but not yet on the egress side. clsact_destroy() tests whether the\n{ingress,egress}_entry was non-NULL. However, even in midway failure on the\nreplacement, both are in fact non-NULL with a valid egress_entry from the\nprevious clsact instance.\n\nWhat we really need to test for is whether the qdisc instance-specific ingress\nor egress side previously got initialized. This adds a small helper for checking\nthe miniq initialization called mini_qdisc_pair_inited, and utilizes that upon\nclsact_destroy() in order to fix the use-after-free scenario. Convert the\ningress_destroy() side as well so both are consistent to each other.",
  "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-2026-23413"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a73d95b57bf9faebdfed591bcb7ed9292062a84c"
    },
    {
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      "url": "https://git.kernel.org/stable/c/37bef86e5428d59f70a4da82b80f9a8f252fecbe"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4c9af67f99aa3e51b522c54968ab3ac8272be41c"
    },
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      "url": "https://git.kernel.org/stable/c/0509b762bc5e8ea7b8391130730c6d8502fc6e69"
    },
    {
      "type": "FIX",
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    }
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable `clsact` qdisc init/destroy path is reached through local rtnetlink `RTM_NEWQDISC` traffic, not by remote packets directly.\nAC:L - The failure path is attacker-controlled by creating/replacing `clsact` with shared block indexes so `tcf_block_get_ext()` fails during rollback; no uncontrollable race is required.\nPR:L - `RTM_NEWQDISC` requires `CAP_NET_ADMIN` in the target network namespace, and `tc`/qdisc operations are reachable by an unprivileged user via user+network namespaces.\nUI:N - After local access, exploitation only requires issuing crafted netlink/qdisc operations and does not require victim interaction.\nS:U - The bug is a standard kernel memory corruption issue within the same kernel security authority, not a VM or hardware isolation boundary escape.\nC:H - The bug is a use-after-free of `tcx_entry` state reachable through old `clsact` miniq callbacks, and UAF memory reuse can provide kernel memory disclosure primitives.\nI:H - The stale miniq pointer can lead to writes through freed/reallocated kernel memory, making control-flow or kernel data corruption defensible.\nA:H - The same UAF can be triggered into kernel crashes/oopses during qdisc/filter cleanup or callback paths, causing high availability impact."
    }
  }
}