CVE-2026-68405wifi: mac80211: free AP_VLAN bc_buf SKBs outside IRQ lock
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Aug 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 397a7a24ef8c2967a3e8090013f9c54714110c48 builds before 0d2619e708e2ef02ba1c91642ea261d3f19d8f9a; from 397a7a24ef8c2967a3e8090013f9c54714110c48 before 659a81b62a61440b85e02c09903be861ae7679e5; from 397a7a24ef8c2967a3e8090013f9c54714110c48 before aa01ef0ebbc3289154229ef58e65baf289eb9789; from 397a7a24ef8c2967a3e8090013f9c54714110c48 before be9dfcb0654c1f6c0fce7ba2a909683bb6f1e0ef; from 397a7a24ef8c2967a3e8090013f9c54714110c48 before 962f755a47d7ec3bbf6c709697d7f4c5f798441d; from 397a7a24ef8c2967a3e8090013f9c54714110c48 before a424985c3ef2a87ce6057a853e18d0c441a86be8; 397a7a24ef8c2967a3e8090013f9c54714110c48 builds before 4b8abf43bf34791c99d99dc3be13f897adefc461; from 397a7a24ef8c2967a3e8090013f9c54714110c48 before f3858d5b1432098c1936e03d6e03dd0e33facf60 | CNA record |
References
- https://git.kernel.org/stable/c/0d2619e708e2ef02ba1c91642ea261d3f19d8f9a
- https://git.kernel.org/stable/c/659a81b62a61440b85e02c09903be861ae7679e5
- https://git.kernel.org/stable/c/aa01ef0ebbc3289154229ef58e65baf289eb9789
- https://git.kernel.org/stable/c/be9dfcb0654c1f6c0fce7ba2a909683bb6f1e0ef
- https://git.kernel.org/stable/c/962f755a47d7ec3bbf6c709697d7f4c5f798441d
- https://git.kernel.org/stable/c/a424985c3ef2a87ce6057a853e18d0c441a86be8
- https://git.kernel.org/stable/c/4b8abf43bf34791c99d99dc3be13f897adefc461
- https://git.kernel.org/stable/c/f3858d5b1432098c1936e03d6e03dd0e33facf60
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.