{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-31548",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-31548"
  ],
  "published": "2026-04-24T14:33:31Z",
  "summary": "wifi: cfg80211: cancel pmsr_free_wk in cfg80211_pmsr_wdev_down",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: cfg80211: cancel pmsr_free_wk in cfg80211_pmsr_wdev_down\n\nWhen the nl80211 socket that originated a PMSR request is\nclosed, cfg80211_release_pmsr() sets the request's nl_portid\nto zero and schedules pmsr_free_wk to process the abort\nasynchronously. If the interface is concurrently torn down\nbefore that work runs, cfg80211_pmsr_wdev_down() calls\ncfg80211_pmsr_process_abort() directly. However, the already-\nscheduled pmsr_free_wk work item remains pending and may run\nafter the interface has been removed from the driver. This\ncould cause the driver's abort_pmsr callback to operate on a\ntorn-down interface, leading to undefined behavior and\npotential crashes.\n\nCancel pmsr_free_wk synchronously in cfg80211_pmsr_wdev_down()\nbefore calling cfg80211_pmsr_process_abort(). This ensures any\npending or in-progress work is drained before interface teardown\nproceeds, preventing the work from invoking the driver abort\ncallback after the interface is gone.",
  "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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    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-31548"
    },
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    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable path is reached through local nl80211 generic-netlink operations for `NL80211_CMD_PEER_MEASUREMENT_START` and netlink socket teardown/device teardown, not by remote WiFi frames alone.\nAC:L - The attacker can create the PMSR request, close the originating netlink socket to schedule `pmsr_free_wk`, and trigger interface teardown concurrently; this is an attacker-controlled race.\nPR:L - The start path is gated by `GENL_UNS_ADMIN_PERM`, requiring `CAP_NET_ADMIN` in the relevant network namespace. Under the kernel guidance, namespace-reachable `CAP_NET_ADMIN` is Low privileges rather than High.\nUI:N - No victim action is required once the attacker has local access and the needed netlink privilege; the attacker controls the request, socket close, and teardown sequence.\nS:U - The impact remains within the kernel/driver security authority and does not cross a VM, IOMMU, or separate sandbox boundary.\nC:H - The stale pending work can operate on a torn-down wireless interface and driver state, a use-after-teardown/use-after-free style condition. In the highest defensible case, freed or invalid kernel objects may be reused to gain memory disclosure primitives.\nI:H - The same stale work and driver callback path can dereference and act on invalid or reallocated kernel/driver objects. Treating this as exploitable memory corruption makes arbitrary write or control-flow impact defensible.\nA:H - The commit explicitly describes undefined behavior and potential crashes from invoking the abort callback after interface teardown. A kernel crash or oops is High availability impact."
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}