CVE-2026-99061 (GCVE-0-2026-99061)

Vulnerability from cvelistv5 – Published: 2026-10-23 12:22 – Updated: 2026-10-23 12:22
VLAI
Title
wifi: brcmfmac: fix P2P device removal race in brcmf_detach()
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: fix P2P device removal race in brcmf_detach() When the driver is removed while the user space process that created the P2P device (e.g. wpa_supplicant) is still exiting, the P2P device interface is removed twice and the kernel crashes. The two paths are: - wpa_supplicant, on exit, sends NL80211_CMD_DEL_INTERFACE for the P2P device. nl80211_del_interface() holds RTNL and the wiphy mutex and calls brcmf_p2p_del_vif(), which disables discovery and waits up to 1.5 s for BRCMF_E_IF_DEL. Then it calls brcmf_remove_interface(), which unregisters the wdev and frees the vif and the ifp. - brcmf_detach() sets the bus down, so BRCMF_E_IF_DEL never arrives, and calls brcmf_remove_interface(ifp, false) for the same ifp. brcmf_p2p_ifp_removed() reads ifp->vif and then blocks on rtnl_lock(). When brcmf_p2p_del_vif() releases RTNL, it calls cfg80211_unregister_wdev() on the wdev that was already unregistered and freed. The second list_del_rcu() of wdev->list faults on LIST_POISON2: brcmfmac: brcmf_p2p_del_vif delete P2P vif brcmfmac: brcmf_p2p_deinit_discovery enter brcmfmac: brcmf_p2p_del_vif P2P: GO_NEG_PHASE status cleared brcmfmac: brcmf_detach Enter brcmfmac: brcmf_bus_change_state 1 -> 0 brcmfmac: brcmf_remove_interface Enter, bsscfgidx=1, ifidx=0 brcmfmac: brcmf_del_if Enter, bsscfgidx=1, ifidx=0 brcmfmac: brcmf_p2p_ifp_removed P2P: device interface removed [1.5 s later, brcmf_p2p_del_vif() timed out] brcmfmac: brcmf_remove_interface Enter, bsscfgidx=1, ifidx=0 brcmfmac: brcmf_del_if Enter, bsscfgidx=1, ifidx=0 brcmfmac: brcmf_p2p_ifp_removed P2P: device interface removed Unable to handle kernel paging request at virtual address dead000000000122 Internal error: Oops: 96000044 [#1] PREEMPT_RT SMP pc : _cfg80211_unregister_wdev+0x6c/0x264 [cfg80211] Call trace: _cfg80211_unregister_wdev+0x6c/0x264 [cfg80211] cfg80211_unregister_wdev+0x10/0x1c [cfg80211] brcmf_p2p_ifp_removed+0x84/0xb0 [brcmfmac] brcmf_remove_interface+0x1f4/0x254 [brcmfmac] brcmf_detach+0x88/0x180 [brcmfmac] brcmf_sdio_remove+0x90/0x7b0 [brcmfmac] brcmf_sdiod_remove+0x20/0xa0 [brcmfmac] brcmf_ops_sdio_remove+0xbc/0x12c [brcmfmac] sdio_bus_remove+0x38/0x144 device_release_driver_internal+0x1e8/0x2c0 device_release_driver+0x14/0x20 brcmf_sdio_bus_remove+0x2c/0x40 [brcmfmac] brcmf_fwvid_unregister_vendor+0xd8/0x170 [brcmfmac] __exit_compat+0x18/0x418 [brcmfmac_cyw] __arm64_sys_delete_module+0x1ac/0x244 The log was taken with debug=0x406 on an i.MX 8M Plus board with a CYW55513 (Sona IF513) on SDIO. The driver is the Ezurio backport of brcmfmac from v6.18.22 on a 5.4-rt kernel. The code involved is the same in mainline. To reproduce: 1. Start wpa_supplicant on wlan0 and let it associate. It creates the P2P device (iw dev shows "type P2P-device"). 2. Stop wpa_supplicant and remove the driver without waiting for wpa_supplicant to exit: kill $(pidof wpa_supplicant) rmmod brcmfmac_cyw brcmfmac The crash is reproducible on that board. For the interface without a netdev (the P2P device), take RTNL and the wiphy mutex in brcmf_detach() before reading iflist, and remove it with locked=true. If brcmf_p2p_del_vif() runs first, brcmf_detach() finds the slot empty. If brcmf_detach() runs first, nl80211 does not find the wdev any more. The interfaces with a netdev are removed as before, because brcmf_del_if() takes RTNL on its own for the primary interface.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7063 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9831bcb987df4aff6a1d85975f1dda4c654f298d , < 7b79131e357c4786765b20a994ad40d4d35f2163 (git)
Affected: 9831bcb987df4aff6a1d85975f1dda4c654f298d , < 2e0c8c60a11b3177e7432c71d41249e276a0825f (git)
Affected: 9831bcb987df4aff6a1d85975f1dda4c654f298d , < eef16a74ff8ed2a838d6bb862bb2c7783fce7466 (git)
Affected: 9831bcb987df4aff6a1d85975f1dda4c654f298d , < 47ca6395a1d91545cc9403f9218bc61be941a0c3 (git)
Affected: 9831bcb987df4aff6a1d85975f1dda4c654f298d , < 08a3f02fea636e97a7422d1512f76dacdb5b0887 (git)
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Linux Linux Affected: 4.4
Unaffected: 0 , < 4.4 (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.113 , ≤ 6.12.* (semver)
Unaffected: 6.18.57 , ≤ 6.18.* (semver)
Unaffected: 7.2.11 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c"
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              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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          "nodes": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: brcmfmac: fix P2P device removal race in brcmf_detach()\n\nWhen the driver is removed while the user space process that created\nthe P2P device (e.g. wpa_supplicant) is still exiting, the P2P device\ninterface is removed twice and the kernel crashes.\n\nThe two paths are:\n\n - wpa_supplicant, on exit, sends NL80211_CMD_DEL_INTERFACE for the P2P\n   device. nl80211_del_interface() holds RTNL and the wiphy mutex and\n   calls brcmf_p2p_del_vif(), which disables discovery and waits up to\n   1.5 s for BRCMF_E_IF_DEL. Then it calls brcmf_remove_interface(),\n   which unregisters the wdev and frees the vif and the ifp.\n\n - brcmf_detach() sets the bus down, so BRCMF_E_IF_DEL never arrives,\n   and calls brcmf_remove_interface(ifp, false) for the same ifp.\n   brcmf_p2p_ifp_removed() reads ifp-\u003evif and then blocks on\n   rtnl_lock(). When brcmf_p2p_del_vif() releases RTNL, it calls\n   cfg80211_unregister_wdev() on the wdev that was already unregistered\n   and freed.\n\nThe second list_del_rcu() of wdev-\u003elist faults on LIST_POISON2:\n\n  brcmfmac: brcmf_p2p_del_vif delete P2P vif\n  brcmfmac: brcmf_p2p_deinit_discovery enter\n  brcmfmac: brcmf_p2p_del_vif P2P: GO_NEG_PHASE status cleared\n  brcmfmac: brcmf_detach Enter\n  brcmfmac: brcmf_bus_change_state 1 -\u003e 0\n  brcmfmac: brcmf_remove_interface Enter, bsscfgidx=1, ifidx=0\n  brcmfmac: brcmf_del_if Enter, bsscfgidx=1, ifidx=0\n  brcmfmac: brcmf_p2p_ifp_removed P2P: device interface removed\n  [1.5 s later, brcmf_p2p_del_vif() timed out]\n  brcmfmac: brcmf_remove_interface Enter, bsscfgidx=1, ifidx=0\n  brcmfmac: brcmf_del_if Enter, bsscfgidx=1, ifidx=0\n  brcmfmac: brcmf_p2p_ifp_removed P2P: device interface removed\n  Unable to handle kernel paging request at virtual address dead000000000122\n  Internal error: Oops: 96000044 [#1] PREEMPT_RT SMP\n  pc : _cfg80211_unregister_wdev+0x6c/0x264 [cfg80211]\n  Call trace:\n   _cfg80211_unregister_wdev+0x6c/0x264 [cfg80211]\n   cfg80211_unregister_wdev+0x10/0x1c [cfg80211]\n   brcmf_p2p_ifp_removed+0x84/0xb0 [brcmfmac]\n   brcmf_remove_interface+0x1f4/0x254 [brcmfmac]\n   brcmf_detach+0x88/0x180 [brcmfmac]\n   brcmf_sdio_remove+0x90/0x7b0 [brcmfmac]\n   brcmf_sdiod_remove+0x20/0xa0 [brcmfmac]\n   brcmf_ops_sdio_remove+0xbc/0x12c [brcmfmac]\n   sdio_bus_remove+0x38/0x144\n   device_release_driver_internal+0x1e8/0x2c0\n   device_release_driver+0x14/0x20\n   brcmf_sdio_bus_remove+0x2c/0x40 [brcmfmac]\n   brcmf_fwvid_unregister_vendor+0xd8/0x170 [brcmfmac]\n   __exit_compat+0x18/0x418 [brcmfmac_cyw]\n   __arm64_sys_delete_module+0x1ac/0x244\n\nThe log was taken with debug=0x406 on an i.MX 8M Plus board with a\nCYW55513 (Sona IF513) on SDIO. The driver is the Ezurio backport of\nbrcmfmac from v6.18.22 on a 5.4-rt kernel. The code involved is the same\nin mainline.\n\nTo reproduce:\n\n  1. Start wpa_supplicant on wlan0 and let it associate. It creates the\n     P2P device (iw dev shows \"type P2P-device\").\n  2. Stop wpa_supplicant and remove the driver without waiting for\n     wpa_supplicant to exit:\n\n       kill $(pidof wpa_supplicant)\n       rmmod brcmfmac_cyw brcmfmac\n\nThe crash is reproducible on that board.\n\nFor the interface without a netdev (the P2P device), take RTNL and the\nwiphy mutex in brcmf_detach() before reading iflist, and remove it with\nlocked=true. If brcmf_p2p_del_vif() runs first, brcmf_detach() finds the\nslot empty. If brcmf_detach() runs first, nl80211 does not find the wdev\nany more. The interfaces with a netdev are removed as before, because\nbrcmf_del_if() takes RTNL on its own for the primary interface."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-23T12:22:59.770Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/7b79131e357c4786765b20a994ad40d4d35f2163"
        },
        {
          "url": "https://git.kernel.org/stable/c/2e0c8c60a11b3177e7432c71d41249e276a0825f"
        },
        {
          "url": "https://git.kernel.org/stable/c/eef16a74ff8ed2a838d6bb862bb2c7783fce7466"
        },
        {
          "url": "https://git.kernel.org/stable/c/47ca6395a1d91545cc9403f9218bc61be941a0c3"
        },
        {
          "url": "https://git.kernel.org/stable/c/08a3f02fea636e97a7422d1512f76dacdb5b0887"
        }
      ],
      "title": "wifi: brcmfmac: fix P2P device removal race in brcmf_detach()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-99061",
    "datePublished": "2026-10-23T12:22:59.770Z",
    "dateReserved": "2026-09-25T10:25:14.388Z",
    "dateUpdated": "2026-10-23T12:22:59.770Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-99061",
      "date": "2026-10-26",
      "epss": "0.00168",
      "percentile": "0.06164"
    },
    "microsoft_vex": {
      "current_release_date": "2026-10-26T14:48:24.000Z",
      "cve": "CVE-2026-99061",
      "id": "msrc_CVE-2026-99061",
      "initial_release_date": "2026-10-25T01:04:55.000Z",
      "product_status:known_affected": "1",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "wifi: brcmfmac: fix P2P device removal race in brcmf_detach()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-99061.json",
      "version": "3"
    },
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                "vendor": "Linux",
                "versions": [
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                    "version": "4.4"
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          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: brcmfmac: fix P2P device removal race in brcmf_detach()\n\nWhen the driver is removed while the user space process that created\nthe P2P device (e.g. wpa_supplicant) is still exiting, the P2P device\ninterface is removed twice and the kernel crashes.\n\nThe two paths are:\n\n - wpa_supplicant, on exit, sends NL80211_CMD_DEL_INTERFACE for the P2P\n   device. nl80211_del_interface() holds RTNL and the wiphy mutex and\n   calls brcmf_p2p_del_vif(), which disables discovery and waits up to\n   1.5 s for BRCMF_E_IF_DEL. Then it calls brcmf_remove_interface(),\n   which unregisters the wdev and frees the vif and the ifp.\n\n - brcmf_detach() sets the bus down, so BRCMF_E_IF_DEL never arrives,\n   and calls brcmf_remove_interface(ifp, false) for the same ifp.\n   brcmf_p2p_ifp_removed() reads ifp-\u003evif and then blocks on\n   rtnl_lock(). When brcmf_p2p_del_vif() releases RTNL, it calls\n   cfg80211_unregister_wdev() on the wdev that was already unregistered\n   and freed.\n\nThe second list_del_rcu() of wdev-\u003elist faults on LIST_POISON2:\n\n  brcmfmac: brcmf_p2p_del_vif delete P2P vif\n  brcmfmac: brcmf_p2p_deinit_discovery enter\n  brcmfmac: brcmf_p2p_del_vif P2P: GO_NEG_PHASE status cleared\n  brcmfmac: brcmf_detach Enter\n  brcmfmac: brcmf_bus_change_state 1 -\u003e 0\n  brcmfmac: brcmf_remove_interface Enter, bsscfgidx=1, ifidx=0\n  brcmfmac: brcmf_del_if Enter, bsscfgidx=1, ifidx=0\n  brcmfmac: brcmf_p2p_ifp_removed P2P: device interface removed\n  [1.5 s later, brcmf_p2p_del_vif() timed out]\n  brcmfmac: brcmf_remove_interface Enter, bsscfgidx=1, ifidx=0\n  brcmfmac: brcmf_del_if Enter, bsscfgidx=1, ifidx=0\n  brcmfmac: brcmf_p2p_ifp_removed P2P: device interface removed\n  Unable to handle kernel paging request at virtual address dead000000000122\n  Internal error: Oops: 96000044 [#1] PREEMPT_RT SMP\n  pc : _cfg80211_unregister_wdev+0x6c/0x264 [cfg80211]\n  Call trace:\n   _cfg80211_unregister_wdev+0x6c/0x264 [cfg80211]\n   cfg80211_unregister_wdev+0x10/0x1c [cfg80211]\n   brcmf_p2p_ifp_removed+0x84/0xb0 [brcmfmac]\n   brcmf_remove_interface+0x1f4/0x254 [brcmfmac]\n   brcmf_detach+0x88/0x180 [brcmfmac]\n   brcmf_sdio_remove+0x90/0x7b0 [brcmfmac]\n   brcmf_sdiod_remove+0x20/0xa0 [brcmfmac]\n   brcmf_ops_sdio_remove+0xbc/0x12c [brcmfmac]\n   sdio_bus_remove+0x38/0x144\n   device_release_driver_internal+0x1e8/0x2c0\n   device_release_driver+0x14/0x20\n   brcmf_sdio_bus_remove+0x2c/0x40 [brcmfmac]\n   brcmf_fwvid_unregister_vendor+0xd8/0x170 [brcmfmac]\n   __exit_compat+0x18/0x418 [brcmfmac_cyw]\n   __arm64_sys_delete_module+0x1ac/0x244\n\nThe log was taken with debug=0x406 on an i.MX 8M Plus board with a\nCYW55513 (Sona IF513) on SDIO. The driver is the Ezurio backport of\nbrcmfmac from v6.18.22 on a 5.4-rt kernel. The code involved is the same\nin mainline.\n\nTo reproduce:\n\n  1. Start wpa_supplicant on wlan0 and let it associate. It creates the\n     P2P device (iw dev shows \"type P2P-device\").\n  2. Stop wpa_supplicant and remove the driver without waiting for\n     wpa_supplicant to exit:\n\n       kill $(pidof wpa_supplicant)\n       rmmod brcmfmac_cyw brcmfmac\n\nThe crash is reproducible on that board.\n\nFor the interface without a netdev (the P2P device), take RTNL and the\nwiphy mutex in brcmf_detach() before reading iflist, and remove it with\nlocked=true. If brcmf_p2p_del_vif() runs first, brcmf_detach() finds the\nslot empty. If brcmf_detach() runs first, nl80211 does not find the wdev\nany more. The interfaces with a netdev are removed as before, because\nbrcmf_del_if() takes RTNL on its own for the primary interface."
          }
        ],
        "id": "CVE-2026-99061",
        "lastModified": "2026-10-23T13:17:29.873",
        "metrics": {},
        "published": "2026-10-23T13:17:29.873",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/08a3f02fea636e97a7422d1512f76dacdb5b0887"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/2e0c8c60a11b3177e7432c71d41249e276a0825f"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/47ca6395a1d91545cc9403f9218bc61be941a0c3"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7b79131e357c4786765b20a994ad40d4d35f2163"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/eef16a74ff8ed2a838d6bb862bb2c7783fce7466"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-27T05:32:12+00:00",
      "cve": "CVE-2026-99061",
      "id": "CVE-2026-99061",
      "initial_release_date": "2026-10-23T00:00:00+00:00",
      "product_status:known_affected": "236",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: wifi: brcmfmac: fix P2P device removal race in brcmf_detach()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-99061.json",
      "version": "3"
    }
  }
}



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