{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-52919",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-52919"
  ],
  "published": "2026-06-24T07:13:41Z",
  "summary": "batman-adv: fix tp_meter counter underflow during shutdown",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: fix tp_meter counter underflow during shutdown\n\nbatadv_tp_sender_shutdown() unconditionally decrements the \"sending\"\natomic counter. If multiple paths (e.g. timeout, user cancel, and\nnormal finish) call this function, the counter can underflow to -1.\n\nSince the sender logic treats any non-zero value as \"still sending\",\na negative value causes the sender kthread to loop indefinitely.\nThis leads to a use-after-free when the interface is removed while\nthe zombie thread is still active.\n\nFix this by using atomic_xchg() to ensure the counter only transitions\nfrom 1 to 0 once.\n\n[sven: added missing change in batadv_tp_send]",
  "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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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-52919"
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    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
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      "scenario": "AV:L - The vulnerable sender shutdown path is reached through the batman-adv generic netlink tp_meter start/cancel operations and mesh-interface teardown, which are local kernel control interfaces rather than packets alone. Adjacent mesh packets can influence timing, but an attacker must be able to initiate or cancel the tp_meter session locally to reliably hit the underflow.\nAC:L - The underflow occurs when multiple attacker-controllable stop paths act on the same session, such as a short test/timeout plus cancel or teardown. Although timing is involved, the attacker controls the session lifetime and can repeat the race, so this is low complexity.\nPR:L - The tp_meter genl commands use GENL_UNS_ADMIN_PERM, requiring CAP_NET_ADMIN in the caller's user namespace. Because batman-adv is netns-aware and can be driven from user namespaces when available, this is low rather than high privilege.\nUI:N - A local attacker with the required namespace capability can create/start/cancel/tear down the tp_meter session without any separate victim action. No user needs to open a file, mount anything, or interact with attacker-controlled data.\nS:U - The bug corrupts/uses kernel networking subsystem state within the same kernel security authority. It is not a VM escape, IOMMU bypass, or cross-authority boundary violation.\nC:H - The fix commit states the negative sender counter leaves a zombie kthread active and leads to a use-after-free during interface removal. Per kernel scoring guidance, a kernel UAF is treated as potentially enabling high confidentiality impact.\nI:H - The resulting use-after-free is kernel memory corruption and can plausibly be shaped into write/control-flow primitives in the most severe reasonable scenario. Per guidance, kernel UAFs are scored as high integrity impact.\nA:H - At minimum, the negative counter can keep the sender kthread looping indefinitely and hang teardown; the documented UAF can also crash the kernel. This is high availability impact."
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}