CVE-2026-68405
Full vulnerability record from the local CVENow database.
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
Severity
Not scored
CVSS score
Not available
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-08-10 13:20:34.053000
Last modified
2026-11-06 17:19:31.763000
View original CVE JSON
{
"id": "CVE-2026-68405",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-08-10T13:20:34.053",
"lastModified": "2026-11-06T17:19:31.763",
"vulnStatus": "Received",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: free AP_VLAN bc_buf SKBs outside IRQ lock\n\nieee80211_do_stop() removes AP_VLAN packets from the parent AP\nps->bc_buf while holding ps->bc_buf.lock with IRQs disabled. It then\ncalls ieee80211_free_txskb() before dropping the lock.\n\nieee80211_free_txskb() is not just a passive SKB release. For SKBs with\nTX status state it can report a dropped frame through cfg80211/nl80211,\nand that path can reach netlink tap transmit. This is the same reason\nthe pending queue cleanup in ieee80211_do_stop() already unlinks SKBs\nunder the queue lock and frees them after IRQ state is restored.\n\nThe buggy scenario involves two paths, with each column showing the\norder within that path:\n\nAP_VLAN management TX: AP_VLAN stop:\n1. attach ACK-status state 1. clear the running state\n2. queue a multicast SKB on 2. take ps->bc_buf.lock with IRQs\n parent ps->bc_buf disabled\n 3. unlink the AP_VLAN SKB\n 4. call ieee80211_free_txskb()\n\nUnlink matching AP_VLAN SKBs from ps->bc_buf under the existing lock,\nbut move them to a local free queue. Drop the lock and restore IRQ state\nbefore calling ieee80211_free_txskb().\n\nWARNING: kernel/softirq.c:430 at __local_bh_enable_ip"
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"net/mac80211/iface.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "397a7a24ef8c2967a3e8090013f9c54714110c48",
"lessThan": "0d2619e708e2ef02ba1c91642ea261d3f19d8f9a",
"versionType": "git",
"status": "affected"
},
{
"version": "397a7a24ef8c2967a3e8090013f9c54714110c48",
"lessThan": "659a81b62a61440b85e02c09903be861ae7679e5",
"versionType": "git",
"status": "affected"
},
{
"version": "397a7a24ef8c2967a3e8090013f9c54714110c48",
"lessThan": "aa01ef0ebbc3289154229ef58e65baf289eb9789",
"versionType": "git",
"status": "affected"
},
{
"version": "397a7a24ef8c2967a3e8090013f9c54714110c48",
"lessThan": "be9dfcb0654c1f6c0fce7ba2a909683bb6f1e0ef",
"versionType": "git",
"status": "affected"
},
{
"version": "397a7a24ef8c2967a3e8090013f9c54714110c48",
"lessThan": "962f755a47d7ec3bbf6c709697d7f4c5f798441d",
"versionType": "git",
"status": "affected"
},
{
"version": "397a7a24ef8c2967a3e8090013f9c54714110c48",
"lessThan": "a424985c3ef2a87ce6057a853e18d0c441a86be8",
"versionType": "git",
"status": "affected"
},
{
"version": "397a7a24ef8c2967a3e8090013f9c54714110c48",
"lessThan": "4b8abf43bf34791c99d99dc3be13f897adefc461",
"versionType": "git",
"status": "affected"
},
{
"version": "397a7a24ef8c2967a3e8090013f9c54714110c48",
"lessThan": "f3858d5b1432098c1936e03d6e03dd0e33facf60",
"versionType": "git",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"net/mac80211/iface.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "3.9",
"status": "affected"
},
{
"version": "0",
"lessThan": "3.9",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.10.265",
"lessThanOrEqual": "5.10.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.15.216",
"lessThanOrEqual": "5.15.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.183",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.148",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.101",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.42",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.1.6",
"lessThanOrEqual": "7.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-11-06T16:48:43.826413Z",
"id": "CVE-2026-68405",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"references": [
{
"url": "https://git.kernel.org/stable/c/0d2619e708e2ef02ba1c91642ea261d3f19d8f9a",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/4b8abf43bf34791c99d99dc3be13f897adefc461",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/659a81b62a61440b85e02c09903be861ae7679e5",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/962f755a47d7ec3bbf6c709697d7f4c5f798441d",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/a424985c3ef2a87ce6057a853e18d0c441a86be8",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/aa01ef0ebbc3289154229ef58e65baf289eb9789",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/be9dfcb0654c1f6c0fce7ba2a909683bb6f1e0ef",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/f3858d5b1432098c1936e03d6e03dd0e33facf60",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}