CVE-2026-68408 (GCVE-0-2026-68408)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:04 – Updated: 2026-08-17 05:04
VLAI
Title
wifi: cfg80211: convert pmsr_free_wk to wiphy_work to fix deadlock
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().
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d32c07ef1880fe20cf4ab223dbfedc9c0b2816aa , < 21512b5f7a74fd18c996c22e6854efe57d570816 (git)
Affected: a1b7a843f12a0c3e9d3a2ca607ce451916ef42cf , < 133684982dd0c24359fcc641d19d89cc17d6e5ef (git)
Affected: 6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09 , < 0a77d9fb4d5c0e01306cd406ffdee8f1fe955c0e (git)
Affected: 6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09 , < 2b0eab425e1f658d8fe1df7590e3b9af5959505e (git)
Affected: 28d3551f8d8cb3aec7497894d94150fe84d20e5e (git)
Affected: 37e776e2e0a523731e2470dce6d563f0e8632a40 (git)
Affected: 72b7ea786b8e570ae11149e9089859a4a8634a13 (git)
Affected: 6.12.78 , < 6.12.101 (semver)
Affected: 6.18.20 , < 6.18.42 (semver)
Affected: 6.1.167 , < 6.2 (semver)
Affected: 6.6.130 , < 6.7 (semver)
Affected: 6.19.10 , < 6.20 (semver)
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Linux Linux Affected: 7.0
Unaffected: 0 , < 7.0 (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "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()."
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      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:04:58.708Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/21512b5f7a74fd18c996c22e6854efe57d570816"
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          "url": "https://git.kernel.org/stable/c/133684982dd0c24359fcc641d19d89cc17d6e5ef"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68408",
    "datePublished": "2026-08-10T12:04:28.172Z",
    "dateReserved": "2026-07-30T09:28:09.390Z",
    "dateUpdated": "2026-08-17T05:04:58.708Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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      "cve": "CVE-2026-68408",
      "date": "2026-08-20",
      "epss": "0.00168",
      "percentile": "0.06508"
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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().\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"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\",\"versions\":[{\"version\":\"d32c07ef1880fe20cf4ab223dbfedc9c0b2816aa\",\"lessThan\":\"21512b5f7a74fd18c996c22e6854efe57d570816\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a1b7a843f12a0c3e9d3a2ca607ce451916ef42cf\",\"lessThan\":\"133684982dd0c24359fcc641d19d89cc17d6e5ef\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09\",\"lessThan\":\"0a77d9fb4d5c0e01306cd406ffdee8f1fe955c0e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09\",\"lessThan\":\"2b0eab425e1f658d8fe1df7590e3b9af5959505e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"28d3551f8d8cb3aec7497894d94150fe84d20e5e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"37e776e2e0a523731e2470dce6d563f0e8632a40\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"72b7ea786b8e570ae11149e9089859a4a8634a13\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6.12.78\",\"lessThan\":\"6.12.101\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.18.20\",\"lessThan\":\"6.18.42\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.1.167\",\"lessThan\":\"6.2\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.6.130\",\"lessThan\":\"6.7\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.19.10\",\"lessThan\":\"6.20\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"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\",\"versions\":[{\"version\":\"7.0\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"7.0\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.101\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.42\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.6\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-11T08:51:37+00:00",
      "cve": "CVE-2026-68408",
      "id": "CVE-2026-68408",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: wifi: cfg80211: convert pmsr_free_wk to wiphy_work to fix deadlock",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68408.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-08-11T23:46:22Z",
      "cve": "CVE-2026-68408",
      "id": "CVE-2026-68408",
      "initial_release_date": "2026-08-11T23:46:22Z",
      "product_status:known_affected": "99",
      "product_status:known_not_affected": "197",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68408",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68408.json",
      "version": "2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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