CVE-2026-68408 (GCVE-0-2026-68408)
Vulnerability from cvelistv5
Published
2026-08-10 12:04
Modified
2026-08-17 05:04
Severity ?
VLAI Severity ?
EPSS score ?
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
| URL | Tags | |
|---|---|---|
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: d32c07ef1880fe20cf4ab223dbfedc9c0b2816aa Version: a1b7a843f12a0c3e9d3a2ca607ce451916ef42cf Version: 6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09 Version: 6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09 Version: 28d3551f8d8cb3aec7497894d94150fe84d20e5e Version: 37e776e2e0a523731e2470dce6d563f0e8632a40 Version: 72b7ea786b8e570ae11149e9089859a4a8634a13 Version: 6.12.78 ≤ Version: 6.18.20 ≤ Version: 6.1.167 ≤ Version: 6.6.130 ≤ Version: 6.19.10 ≤ |
||
{
"containers": {
"cna": {
"affected": [
{
"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"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.101",
"versionStartIncluding": "6.12.78",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.42",
"versionStartIncluding": "6.18.20",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.6",
"versionStartIncluding": "7.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "7.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.1.167",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.6.130",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.19.10",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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()."
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T05:04:58.708Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/21512b5f7a74fd18c996c22e6854efe57d570816"
},
{
"url": "https://git.kernel.org/stable/c/133684982dd0c24359fcc641d19d89cc17d6e5ef"
},
{
"url": "https://git.kernel.org/stable/c/0a77d9fb4d5c0e01306cd406ffdee8f1fe955c0e"
},
{
"url": "https://git.kernel.org/stable/c/2b0eab425e1f658d8fe1df7590e3b9af5959505e"
}
],
"title": "wifi: cfg80211: convert pmsr_free_wk to wiphy_work to fix deadlock",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"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"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
Loading…
Loading…