FKIE_CVE-2026-68408

Vulnerability from fkie_nvd - Published: 2026-08-10 13:20 - Updated: 2026-08-17 06:17
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: convert pmsr_free_wk to wiphy_work to fix deadlock When a netlink socket that owns a PMSR session is closed, cfg80211_release_pmsr() clears the request's nl_portid and queues pmsr_free_wk to call cfg80211_pmsr_process_abort() asynchronously. If the interface tears down concurrently, cfg80211_pmsr_wdev_down() is called under wiphy_lock and calls cancel_work_sync(&pmsr_free_wk) to wait for any running work. The work function acquires wiphy_lock via guard(wiphy) before calling process_abort. This is a deadlock: wdev_down holds wiphy_lock and blocks inside cancel_work_sync(); pmsr_free_wk blocks trying to acquire that same wiphy_lock. Neither thread can proceed. The same deadlock is reachable from cfg80211_leave_locked(), which calls cfg80211_pmsr_wdev_down() for all interface types under wiphy_lock. Fix this by converting pmsr_free_wk from a plain work_struct to a wiphy_work. The wiphy_work dispatcher holds wiphy_lock when running work items, so the explicit guard(wiphy) in the work function is no longer needed. wiphy_work_cancel() can be called safely while holding wiphy_lock - since wiphy_lock prevents the work from running concurrently, wiphy_work_cancel() never blocks, eliminating the deadlock. Remove the cancel_work_sync() for pmsr_free_wk from the NETDEV_GOING_DOWN handler. cfg80211_leave(), called unconditionally just before it, already cancels any pending work under wiphy_lock via wiphy_work_cancel() inside cfg80211_pmsr_wdev_down().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0a77d9fb4d5c0e01306cd406ffdee8f1fe955c0e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/133684982dd0c24359fcc641d19d89cc17d6e5ef
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/21512b5f7a74fd18c996c22e6854efe57d570816
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2b0eab425e1f658d8fe1df7590e3b9af5959505e
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/net/cfg80211.h",
            "net/wireless/core.c",
            "net/wireless/core.h",
            "net/wireless/pmsr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "21512b5f7a74fd18c996c22e6854efe57d570816",
              "status": "affected",
              "version": "d32c07ef1880fe20cf4ab223dbfedc9c0b2816aa",
              "versionType": "git"
            },
            {
              "lessThan": "133684982dd0c24359fcc641d19d89cc17d6e5ef",
              "status": "affected",
              "version": "a1b7a843f12a0c3e9d3a2ca607ce451916ef42cf",
              "versionType": "git"
            },
            {
              "lessThan": "0a77d9fb4d5c0e01306cd406ffdee8f1fe955c0e",
              "status": "affected",
              "version": "6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09",
              "versionType": "git"
            },
            {
              "lessThan": "2b0eab425e1f658d8fe1df7590e3b9af5959505e",
              "status": "affected",
              "version": "6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "28d3551f8d8cb3aec7497894d94150fe84d20e5e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "37e776e2e0a523731e2470dce6d563f0e8632a40",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "72b7ea786b8e570ae11149e9089859a4a8634a13",
              "versionType": "git"
            },
            {
              "lessThan": "6.12.101",
              "status": "affected",
              "version": "6.12.78",
              "versionType": "semver"
            },
            {
              "lessThan": "6.18.42",
              "status": "affected",
              "version": "6.18.20",
              "versionType": "semver"
            },
            {
              "lessThan": "6.2",
              "status": "affected",
              "version": "6.1.167",
              "versionType": "semver"
            },
            {
              "lessThan": "6.7",
              "status": "affected",
              "version": "6.6.130",
              "versionType": "semver"
            },
            {
              "lessThan": "6.20",
              "status": "affected",
              "version": "6.19.10",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/net/cfg80211.h",
            "net/wireless/core.c",
            "net/wireless/core.h",
            "net/wireless/pmsr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.0"
            },
            {
              "lessThan": "7.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: cfg80211: convert pmsr_free_wk to wiphy_work to fix deadlock\n\nWhen a netlink socket that owns a PMSR session is closed,\ncfg80211_release_pmsr() clears the request\u0027s nl_portid and queues\npmsr_free_wk to call cfg80211_pmsr_process_abort() asynchronously.\n\nIf the interface tears down concurrently, cfg80211_pmsr_wdev_down()\nis called under wiphy_lock and calls cancel_work_sync(\u0026pmsr_free_wk)\nto wait for any running work. The work function acquires wiphy_lock\nvia guard(wiphy) before calling process_abort.\n\nThis is a deadlock: wdev_down holds wiphy_lock and blocks inside\ncancel_work_sync(); pmsr_free_wk blocks trying to acquire that same\nwiphy_lock. Neither thread can proceed.\n\nThe same deadlock is reachable from cfg80211_leave_locked(), which\ncalls cfg80211_pmsr_wdev_down() for all interface types under\nwiphy_lock.\n\nFix this by converting pmsr_free_wk from a plain work_struct to a\nwiphy_work. The wiphy_work dispatcher holds wiphy_lock when running\nwork items, so the explicit guard(wiphy) in the work function is no\nlonger needed. wiphy_work_cancel() can be called safely while holding\nwiphy_lock - since wiphy_lock prevents the work from running\nconcurrently, wiphy_work_cancel() never blocks, eliminating the\ndeadlock.\n\nRemove the cancel_work_sync() for pmsr_free_wk from the\nNETDEV_GOING_DOWN handler. cfg80211_leave(), called unconditionally\njust before it, already cancels any pending work under wiphy_lock\nvia wiphy_work_cancel() inside cfg80211_pmsr_wdev_down()."
    }
  ],
  "id": "CVE-2026-68408",
  "lastModified": "2026-08-17T06:17:49.750",
  "metrics": {},
  "published": "2026-08-10T13:20:34.407",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0a77d9fb4d5c0e01306cd406ffdee8f1fe955c0e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/133684982dd0c24359fcc641d19d89cc17d6e5ef"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/21512b5f7a74fd18c996c22e6854efe57d570816"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2b0eab425e1f658d8fe1df7590e3b9af5959505e"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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