CVE-2026-68408
- Source
- https://cve.org/CVERecord?id=CVE-2026-68408
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68408.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-68408
- Downstream
AZL (1)
BELL (1)
DEBIAN (1)
MGASA (2)
openSUSE (1)
SUSE (10)
- Related
- Published
- 2026-08-10T12:04:28Z
- Modified
- 2026-10-08T02:51:38Z
- Summary
- wifi: cfg80211: convert pmsr_free_wk to wiphy_work to fix deadlock
- Details
-
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().
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68408.json" }- References
-
- https://git.kernel.org/stable/c/0a77d9fb4d5c0e01306cd406ffdee8f1fe955c0e
- https://git.kernel.org/stable/c/133684982dd0c24359fcc641d19d89cc17d6e5ef
- https://git.kernel.org/stable/c/21512b5f7a74fd18c996c22e6854efe57d570816
- https://git.kernel.org/stable/c/2b0eab425e1f658d8fe1df7590e3b9af5959505e
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68408.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-68408
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedd32c07ef1880fe20cf4ab223dbfedc9c0b2816aaFixed21512b5f7a74fd18c996c22e6854efe57d570816
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduceda1b7a843f12a0c3e9d3a2ca607ce451916ef42cfFixed133684982dd0c24359fcc641d19d89cc17d6e5ef
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced6dccbc9f3e1d38565dff7730d2b7d1e8b16c9b09Fixed0a77d9fb4d5c0e01306cd406ffdee8f1fe955c0eFixed2b0eab425e1f658d8fe1df7590e3b9af5959505e
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced6.12.78Fixed6.12.101
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced6.18.20Fixed6.18.42
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced6.1.167Fixed6.2
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced6.6.130Fixed6.7
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced6.19.10Fixed6.20
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced28d3551f8d8cb3aec7497894d94150fe84d20e5e
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced37e776e2e0a523731e2470dce6d563f0e8632a40
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced72b7ea786b8e570ae11149e9089859a4a8634a13