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CVE-2026-68405— wifi: mac80211: free AP_VLAN bc_buf SKBs outside IRQ lock

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 3.9版本存在安全漏洞，该漏洞源于mac80211在持有锁且禁用IRQ时释放AP_VLAN bc_buf SKB，可能导致内核警告或系统不稳定。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.22% · P12

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 397a7a24ef8c2967a3e8090013f9c54714110c48< 0d2619e708e2ef02ba1c91642ea261d3f19d8f9a affected
397a7a24ef8c2967a3e8090013f9c54714110c48< 659a81b62a61440b85e02c09903be861ae7679e5 affected
397a7a24ef8c2967a3e8090013f9c54714110c48< aa01ef0ebbc3289154229ef58e65baf289eb9789 affected
397a7a24ef8c2967a3e8090013f9c54714110c48< be9dfcb0654c1f6c0fce7ba2a909683bb6f1e0ef affected
397a7a24ef8c2967a3e8090013f9c54714110c48< 962f755a47d7ec3bbf6c709697d7f4c5f798441d affected
397a7a24ef8c2967a3e8090013f9c54714110c48< a424985c3ef2a87ce6057a853e18d0c441a86be8 affected
397a7a24ef8c2967a3e8090013f9c54714110c48< 4b8abf43bf34791c99d99dc3be13f897adefc461 affected
397a7a24ef8c2967a3e8090013f9c54714110c48< f3858d5b1432098c1936e03d6e03dd0e33facf60 affected
… +10 more rows
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I. Basic Information for CVE-2026-68405

Vulnerability Information
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Vulnerability Title
wifi: mac80211: free AP_VLAN bc_buf SKBs outside IRQ lock
Source: CVE Program / CVE List V5
Vulnerability 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
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 3.9版本存在安全漏洞，该漏洞源于mac80211在持有锁且禁用IRQ时释放AP_VLAN bc_buf SKB，可能导致内核警告或系统不稳定。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 397a7a24ef8c2967a3e8090013f9c54714110c48 ~ 0d2619e708e2ef02ba1c91642ea261d3f19d8f9a -
Linux Linux 3.9 -

II. Public POCs for CVE-2026-68405

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III. Intelligence Information for CVE-2026-68405

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Patches & Fixes for CVE-2026-68405 (6)

Same Patch Batch · Linux · 2026-08-10 · 344 CVEs total

CVE-2026-68117 9.8 CRITICAL tipc: clear sock->sk on the failed-insert path in tipc_sk_create()
CVE-2026-68160 9.8 CRITICAL ceph: fix pre-auth out-of-bounds read on snaptrace in ceph_handle_caps()
CVE-2026-68161 9.8 CRITICAL sctp: close UDP tunnel sockets during netns teardown
CVE-2026-68123 9.8 CRITICAL openvswitch: fix GSO userspace truncation underflow
CVE-2026-68302 9.8 CRITICAL amt: re-read skb header pointers after every pull
CVE-2026-68381 9.8 CRITICAL ksmbd: pin conn during async oplock break notification
CVE-2026-68385 9.8 CRITICAL s390/checksum: Fix csum_partial() without vector facility
CVE-2026-68159 9.8 CRITICAL libceph: bound pg_{temp,upmap,upmap_items} length to CEPH_PG_MAX_SIZE
CVE-2026-68127 9.8 CRITICAL ila: reload IPv6 header after pskb_may_pull in checksum adjust
CVE-2026-68388 9.8 CRITICAL smb/client: handle overlapping allocated ranges in fallocate
CVE-2026-68144 9.8 CRITICAL phonet: pep: fix use-after-free in pep_get_sb()
CVE-2026-68137 9.8 CRITICAL net/x25: fix use-after-free in x25_kill_by_neigh()
CVE-2026-68136 9.8 CRITICAL net: gro: fix double aggregation of flush-marked skbs
CVE-2026-68170 9.8 CRITICAL mptcp: fix stale skb->sk reference on subflow close
CVE-2026-68426 9.8 CRITICAL xfrm: fix stale skb->prev after async crypto steals a GSO segment
CVE-2026-68156 9.8 CRITICAL libceph: refresh auth->authorizer_buf{,_len} after authorizer update
CVE-2026-68158 9.8 CRITICAL libceph: Fix multiplication overflow in decode_new_up_state_weight()
CVE-2026-68300 9.8 CRITICAL sctp: auth: verify auth requirement when auth_chunk is NULL
CVE-2026-68154 9.8 CRITICAL libceph: reject zero bucket types in crush_decode
CVE-2026-68124 9.6 CRITICAL mctp: serial: handle zero-length frames to prevent rx buffer overflow

Showing top 20 of 344 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-68405

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