wifi: mac80211: free AP_VLAN bc_buf SKBs outside IRQ lock
Summary
| CVE | CVE-2026-68405 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-08-10 13:20:34 UTC |
| Updated | 2026-08-19 17:20:48 UTC |
| Description | In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: free AP_VLAN bc_buf SKBs outside IRQ lock ieee80211_do_stop() removes AP_VLAN packets from the parent AP ps->bc_buf while holding ps->bc_buf.lock with IRQs disabled. It then calls ieee80211_free_txskb() before dropping the lock. ieee80211_free_txskb() is not just a passive SKB release. For SKBs with TX status state it can report a dropped frame through cfg80211/nl80211, and that path can reach netlink tap transmit. This is the same reason the pending queue cleanup in ieee80211_do_stop() already unlinks SKBs under the queue lock and frees them after IRQ state is restored. The buggy scenario involves two paths, with each column showing the order within that path: AP_VLAN management TX: AP_VLAN stop: 1. attach ACK-status state 1. clear the running state 2. queue a multicast SKB on 2. take ps->bc_buf.lock with IRQs parent ps->bc_buf disabled 3. unlink the AP_VLAN SKB 4. call ieee80211_free_txskb() Unlink matching AP_VLAN SKBs from ps->bc_buf under the existing lock, but move them to a local free queue. Drop the lock and restore IRQ state before calling ieee80211_free_txskb(). WARNING: kernel/softirq.c:430 at __local_bh_enable_ip |
Risk And Classification
EPSS: 0.002090000 probability, percentile 0.113410000 (date 2026-08-19)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 397a7a24ef8c2967a3e8090013f9c54714110c48 0d2619e708e2ef02ba1c91642ea261d3f19d8f9a git | Not specified |
| CNA | Linux | Linux | affected 397a7a24ef8c2967a3e8090013f9c54714110c48 659a81b62a61440b85e02c09903be861ae7679e5 git | Not specified |
| CNA | Linux | Linux | affected 397a7a24ef8c2967a3e8090013f9c54714110c48 aa01ef0ebbc3289154229ef58e65baf289eb9789 git | Not specified |
| CNA | Linux | Linux | affected 397a7a24ef8c2967a3e8090013f9c54714110c48 be9dfcb0654c1f6c0fce7ba2a909683bb6f1e0ef git | Not specified |
| CNA | Linux | Linux | affected 397a7a24ef8c2967a3e8090013f9c54714110c48 962f755a47d7ec3bbf6c709697d7f4c5f798441d git | Not specified |
| CNA | Linux | Linux | affected 397a7a24ef8c2967a3e8090013f9c54714110c48 a424985c3ef2a87ce6057a853e18d0c441a86be8 git | Not specified |
| CNA | Linux | Linux | affected 397a7a24ef8c2967a3e8090013f9c54714110c48 4b8abf43bf34791c99d99dc3be13f897adefc461 git | Not specified |
| CNA | Linux | Linux | affected 397a7a24ef8c2967a3e8090013f9c54714110c48 f3858d5b1432098c1936e03d6e03dd0e33facf60 git | Not specified |
| CNA | Linux | Linux | affected 3.9 | Not specified |
| CNA | Linux | Linux | unaffected 3.9 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.265 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.216 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.183 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.148 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.101 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.42 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1.6 7.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/962f755a47d7ec3bbf6c709697d7f4c5f798441d | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/659a81b62a61440b85e02c09903be861ae7679e5 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/be9dfcb0654c1f6c0fce7ba2a909683bb6f1e0ef | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/f3858d5b1432098c1936e03d6e03dd0e33facf60 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/4b8abf43bf34791c99d99dc3be13f897adefc461 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/0d2619e708e2ef02ba1c91642ea261d3f19d8f9a | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/a424985c3ef2a87ce6057a853e18d0c441a86be8 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/aa01ef0ebbc3289154229ef58e65baf289eb9789 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.