CVE-2026-68408
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.
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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().
CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.21%
- Percentil entre todas las CVEs puntuadas: 10
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
JSON original (NVD)
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{
"id": "CVE-2026-68408",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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{
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{
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{
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{
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{
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"lessThan": "6.7",
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{
"status": "affected",
"version": "6.19.10",
"lessThan": "6.20",
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"programFiles": [
"include/net/cfg80211.h",
"net/wireless/core.c",
"net/wireless/core.h",
"net/wireless/pmsr.c"
],
"defaultStatus": "unaffected"
},
{
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"versions": [
{
"status": "affected",
"version": "7.0"
},
{
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"version": "0",
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{
"status": "unaffected",
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"versionType": "semver",
"lessThanOrEqual": "6.12.*"
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{
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"version": "6.18.42",
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},
{
"status": "unaffected",
"version": "7.1.6",
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},
{
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"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
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],
"programFiles": [
"include/net/cfg80211.h",
"net/wireless/core.c",
"net/wireless/core.h",
"net/wireless/pmsr.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-08-10T13:20:34.407",
"references": [
{
"url": "https://git.kernel.org/stable/c/0a77d9fb4d5c0e01306cd406ffdee8f1fe955c0e",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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{
"url": "https://git.kernel.org/stable/c/133684982dd0c24359fcc641d19d89cc17d6e5ef",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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{
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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{
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"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's 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(&pmsr_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()."
}
],
"lastModified": "2026-08-17T06:17:49.750",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}