{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-50235",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-50235"
  ],
  "published": "2024-11-09T10:15:51Z",
  "summary": "wifi: cfg80211: clear wdev->cqm_config pointer on free",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: cfg80211: clear wdev->cqm_config pointer on free\n\nWhen we free wdev->cqm_config when unregistering, we also\nneed to clear out the pointer since the same wdev/netdev\nmay get re-registered in another network namespace, then\ndestroyed later, running this code again, which results in\na double-free.",
  "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-2024-50235"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ba392e1355ba74b1d4fa11b85f71ab6ed7ecc058"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6c44abb2d4c3262737d5d67832daebc8cf48b8c9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/64e4c45d23cd7f6167f69cc2d2877bc7f54292e5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d5fee261dfd9e17b08b1df8471ac5d5736070917"
    }
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  "database_specific": {
    "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 reached through nl80211/MAC80211_HWSIM generic netlink commands (`NL80211_CMD_SET_CQM`, `NL80211_CMD_SET_WIPHY_NETNS`) issued by a local process. No remote or adjacent network input is needed to create or trigger the double free.\nAC:L - The sequence is deterministic straight-line netlink configuration \u2014 set CQM thresholds, move the wiphy to another netns, then unregister again \u2014 with no race to win. The attacker also chooses `n_thresholds`, controlling the kmalloc bucket of the freed object and making heap reclaim reliable.\nPR:L - Every required command uses `GENL_UNS_ADMIN_PERM`, i.e. CAP_NET_ADMIN in the socket's user namespace, which an unprivileged user obtains via `unshare -Urn`; `get_net_ns_by_fd()` performs no additional capability check and hwsim radios are created in the caller's own netns.\nUI:N - The attacker performs all steps itself through netlink sockets; no victim action, mount, or file open is required.\nS:U - The corruption is confined to the kernel's own slab allocator and results in kernel-level compromise within the same security authority, with no VM, IOMMU, or sandbox boundary crossed.\nC:H - The double free lets the attacker overlap the freed chunk with a live victim object of a size they control, and the stale pointer is additionally read by `cfg80211_cqm_rssi_notify_work()`/`cfg80211_cqm_rssi_update()`, yielding a use-after-free read that can be escalated to arbitrary kernel memory disclosure.\nI:H - `kfree_rcu()` on the dangling pointer clobbers the first 16 bytes of a reclaimed object with an rcu_head and frees it a second time, and `cfg80211_cqm_rssi_notify()` writes attacker-influenced RSSI values into freed memory \u2014 a classic double-free/UAF write primitive leading to arbitrary write and control-flow hijack.\nA:H - A double free corrupts the SLUB freelist, causing immediate slab corruption BUG/KASAN reports and kernel panics, and can be triggered repeatedly by an unprivileged local user."
    }
  }
}