wifi: mac80211: free AP_VLAN bc_buf SKBs outside IRQ lock
Summary
| CVE | CVE-2026-68405 |
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| State | PUBLISHED |
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| Assigner | Linux |
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| Source Priority | CVE Program / NVD first with legacy fallback |
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| Published | 2026-08-10 13:20:34 UTC |
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| Updated | 2026-08-10 13:20:34 UTC |
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| 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 |
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Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|
| 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 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-rc4 * 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/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/a424985c3ef2a87ce6057a853e18d0c441a86be8 |
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.