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CVE-2026-80936 (GCVE-0-2026-80936)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:42 – Updated: 2026-09-13 06:28
VLAI
Title
wifi: mt76: mt7925: cancel mlo_pm_work on stop
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7925: cancel mlo_pm_work on stop mt7925 queues mlo_pm_work with a 5 second delay during multi-link power-save setup and never cancels it on the stop path. If the device is torn down inside that window, the work outlives the teardown and its timer fires afterwards, trying to queue onto the workqueue that is already gone: workqueue: cannot queue mt7925_mlo_pm_work [mt7925_common] on wq phy0 WARNING: kernel/workqueue.c:2283 at __queue_work+0x59/0xa0, CPU#1: swapper/1/0 call_timer_fn+0x2a/0x140 __run_timers+0x203/0x330 run_timer_softirq+0x86/0xf0 mt7921 already has its own stop callback, so add one for mt7925 that cancels the work before calling mt792x_stop(). mt7925_ops backs both the PCIe and USB drivers, so this covers both.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 276a568832577c81ec90b62dc506bbdc3781ca46 , < 304470333b7f525b23699ea7a7aed3b40ca37ca9 (git)
Affected: 276a568832577c81ec90b62dc506bbdc3781ca46 , < 9e20da749ad229a1aa649ece528721b9652f15e1 (git)
Affected: 276a568832577c81ec90b62dc506bbdc3781ca46 , < 81faf578320df2dfc682a96baa6e85851dd68b6f (git)
Affected: 74eb79258bfd5f2ffe6d26a09c898992b2afa1ce (git)
Affected: 6.14.3 , < 6.15 (semver)
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Linux Linux Affected: 6.15
Unaffected: 0 , < 6.15 (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
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      "affected": [
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          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/mediatek/mt76/mt7925/main.c"
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              "versionType": "semver"
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              "versionType": "original_commit_for_fix"
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                  "vulnerable": true
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mt76: mt7925: cancel mlo_pm_work on stop\n\nmt7925 queues mlo_pm_work with a 5 second delay during multi-link\npower-save setup and never cancels it on the stop path. If the device is\ntorn down inside that window, the work outlives the teardown and its timer\nfires afterwards, trying to queue onto the workqueue that is already gone:\n\n  workqueue: cannot queue mt7925_mlo_pm_work [mt7925_common] on wq phy0\n  WARNING: kernel/workqueue.c:2283 at __queue_work+0x59/0xa0, CPU#1: swapper/1/0\n   call_timer_fn+0x2a/0x140\n   __run_timers+0x203/0x330\n   run_timer_softirq+0x86/0xf0\n\nmt7921 already has its own stop callback, so add one for mt7925 that\ncancels the work before calling mt792x_stop(). mt7925_ops backs both the\nPCIe and USB drivers, so this covers both."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
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              "lang": "en",
              "value": "AV:L - The bug is in mt7925\u0027s mac80211 .stop callback, which leaves mlo_pm_work armed across local driver teardown (last wlan ndo_stop, PCI/USB unbind, USB disconnect, rmmod). Over-the-air frames never call ops-\u003estop; this is a local interface/driver lifecycle path, matching other mt76 stop/cleanup UAFs.\nAC:L - mt7925 queues mlo_pm_work with a fixed 5-second delay during MLO power-save setup; a local attacker who associates to a Wi-Fi 7 MLO AP and then immediately stops or unregisters the device controls both sides and easily hits that window, with no attacker-uncontrollable race or heap layout.\nPR:L - Bringing the wireless interface down and driving nl80211 connect/disconnect uses GENL_UNS_ADMIN_PERM/CAP_NET_ADMIN, and ordinary NetworkManager/polkit or Android Wi-Fi controls expose that to unprivileged local users; per kernel guidance that is Low, not init-namespace root.\nUI:N - The attacker performs MLO association and the subsequent interface or driver teardown themselves; no separate victim action such as opening a file or mounting a filesystem is required.\nS:U - The use-after-free is of host kernel workqueue and mt792x_dev delayed_work state inside the mt7925 driver and does not cross a VM, IOMMU, or sandbox security boundary.\nC:H - Unregister destroys the mac80211 phy workqueue and USB disconnect then mt76_free_device() frees the mt792x_dev that embeds mlo_pm_work while the 5s timer still points at them; a UAF of those objects enables disclosure via heap reclaim and is Confidentiality High per guidance.\nI:H - The dangling delayed_work timer can fire on a freed mt792x_dev (mt792xu_disconnect frees the device without cancelling mlo_pm_work), a classic timer/workqueue UAF that can be turned into writes and control-flow hijack after spraying; guidance rates Integrity High.\nA:H - The pending timer calls __queue_work on a destroying phy workqueue (WARN in kernel/workqueue.c) and can oops when the timer runs against freed delayed_work, causing kernel warning, oops, or panic; any such crash is Availability High."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-13T06:28:16.420Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/304470333b7f525b23699ea7a7aed3b40ca37ca9"
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    "cveId": "CVE-2026-80936",
    "datePublished": "2026-09-11T19:42:10.034Z",
    "dateReserved": "2026-08-26T14:34:25.802Z",
    "dateUpdated": "2026-09-13T06:28:16.420Z",
    "state": "PUBLISHED"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mt76: mt7925: cancel mlo_pm_work on stop\n\nmt7925 queues mlo_pm_work with a 5 second delay during multi-link\npower-save setup and never cancels it on the stop path. If the device is\ntorn down inside that window, the work outlives the teardown and its timer\nfires afterwards, trying to queue onto the workqueue that is already gone:\n\n  workqueue: cannot queue mt7925_mlo_pm_work [mt7925_common] on wq phy0\n  WARNING: kernel/workqueue.c:2283 at __queue_work+0x59/0xa0, CPU#1: swapper/1/0\n   call_timer_fn+0x2a/0x140\n   __run_timers+0x203/0x330\n   run_timer_softirq+0x86/0xf0\n\nmt7921 already has its own stop callback, so add one for mt7925 that\ncancels the work before calling mt792x_stop(). mt7925_ops backs both the\nPCIe and USB drivers, so this covers both."
          }
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        "vulnStatus": "Received"
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      "current_release_date": "2026-09-14T14:54:14+00:00",
      "cve": "CVE-2026-80936",
      "id": "CVE-2026-80936",
      "initial_release_date": "2026-09-11T00:00:00+00:00",
      "product_status:known_affected": "185",
      "product_status:known_not_affected": "91",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: wifi: mt76: mt7925: cancel mlo_pm_work on stop",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80936.json",
      "version": "3"
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      "cve": "CVE-2026-80936",
      "id": "CVE-2026-80936",
      "initial_release_date": "2026-09-15T01:06:05Z",
      "product_status:known_not_affected": "353",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80936",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80936.json",
      "version": "2"
    }
  }
}



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