CVE-2026-68405 (GCVE-0-2026-68405)
Vulnerability from cvelistv5 – Published: 2026-08-10 12:04 – Updated: 2026-08-19 16:34
VLAI
EPSS
VEX
Title
wifi: mac80211: free AP_VLAN bc_buf SKBs outside IRQ lock
Summary
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
No CVSS data available.
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
397a7a24ef8c2967a3e8090013f9c54714110c48 , < 0d2619e708e2ef02ba1c91642ea261d3f19d8f9a
(git)
Affected: 397a7a24ef8c2967a3e8090013f9c54714110c48 , < 659a81b62a61440b85e02c09903be861ae7679e5 (git) Affected: 397a7a24ef8c2967a3e8090013f9c54714110c48 , < aa01ef0ebbc3289154229ef58e65baf289eb9789 (git) Affected: 397a7a24ef8c2967a3e8090013f9c54714110c48 , < be9dfcb0654c1f6c0fce7ba2a909683bb6f1e0ef (git) Affected: 397a7a24ef8c2967a3e8090013f9c54714110c48 , < 962f755a47d7ec3bbf6c709697d7f4c5f798441d (git) Affected: 397a7a24ef8c2967a3e8090013f9c54714110c48 , < a424985c3ef2a87ce6057a853e18d0c441a86be8 (git) Affected: 397a7a24ef8c2967a3e8090013f9c54714110c48 , < 4b8abf43bf34791c99d99dc3be13f897adefc461 (git) Affected: 397a7a24ef8c2967a3e8090013f9c54714110c48 , < f3858d5b1432098c1936e03d6e03dd0e33facf60 (git) |
guessed | |
| Linux | Linux |
Affected:
3.9
Unaffected: 0 , < 3.9 (semver) Unaffected: 5.10.265 , ≤ 5.10.* (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.148 , ≤ 6.6.* (semver) Unaffected: 6.12.101 , ≤ 6.12.* (semver) Unaffected: 6.18.42 , ≤ 6.18.* (semver) Unaffected: 7.1.6 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
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"product": "Linux",
"programFiles": [
"net/mac80211/iface.c"
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{
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"version": "3.9"
},
{
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"version": "0",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "5.10.265",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "5.15.216",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.148",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.101",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.42",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.265",
"versionStartIncluding": "3.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.9",
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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{
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.42",
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.6",
"versionStartIncluding": "3.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "3.9",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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-\u003ebc_buf while holding ps-\u003ebc_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-\u003ebc_buf.lock with IRQs\n parent ps-\u003ebc_buf disabled\n 3. unlink the AP_VLAN SKB\n 4. call ieee80211_free_txskb()\n\nUnlink matching AP_VLAN SKBs from ps-\u003ebc_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"
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T16:34:57.265Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/0d2619e708e2ef02ba1c91642ea261d3f19d8f9a"
},
{
"url": "https://git.kernel.org/stable/c/659a81b62a61440b85e02c09903be861ae7679e5"
},
{
"url": "https://git.kernel.org/stable/c/aa01ef0ebbc3289154229ef58e65baf289eb9789"
},
{
"url": "https://git.kernel.org/stable/c/be9dfcb0654c1f6c0fce7ba2a909683bb6f1e0ef"
},
{
"url": "https://git.kernel.org/stable/c/962f755a47d7ec3bbf6c709697d7f4c5f798441d"
},
{
"url": "https://git.kernel.org/stable/c/a424985c3ef2a87ce6057a853e18d0c441a86be8"
},
{
"url": "https://git.kernel.org/stable/c/4b8abf43bf34791c99d99dc3be13f897adefc461"
},
{
"url": "https://git.kernel.org/stable/c/f3858d5b1432098c1936e03d6e03dd0e33facf60"
}
],
"title": "wifi: mac80211: free AP_VLAN bc_buf SKBs outside IRQ lock",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-68405",
"datePublished": "2026-08-10T12:04:25.241Z",
"dateReserved": "2026-07-30T09:28:09.390Z",
"dateUpdated": "2026-08-19T16:34:57.265Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-68405",
"date": "2026-09-30",
"epss": "0.0022",
"percentile": "0.11235"
},
"nvd": {
"cve": {
"affected": [
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"affectedData": [
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"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/mac80211/iface.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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"lessThan": "0d2619e708e2ef02ba1c91642ea261d3f19d8f9a",
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"version": "397a7a24ef8c2967a3e8090013f9c54714110c48",
"versionType": "git"
},
{
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"status": "affected",
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"versionType": "git"
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"versionType": "git"
},
{
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"versionType": "git"
},
{
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"versionType": "git"
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{
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},
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},
{
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"product": "Linux",
"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "3.9"
},
{
"lessThan": "3.9",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.265",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.148",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.101",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.18.42",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"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-\u003ebc_buf while holding ps-\u003ebc_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-\u003ebc_buf.lock with IRQs\n parent ps-\u003ebc_buf disabled\n 3. unlink the AP_VLAN SKB\n 4. call ieee80211_free_txskb()\n\nUnlink matching AP_VLAN SKBs from ps-\u003ebc_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"
}
],
"id": "CVE-2026-68405",
"lastModified": "2026-08-19T17:20:48.317",
"metrics": {},
"published": "2026-08-10T13:20:34.053",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"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"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-08-31T11:45:31+00:00",
"cve": "CVE-2026-68405",
"id": "CVE-2026-68405",
"initial_release_date": "2026-08-10T00:00:00+00:00",
"product_status:known_affected": "261",
"product_status:known_not_affected": "16",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: wifi: mac80211: free AP_VLAN bc_buf SKBs outside IRQ lock",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68405.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-09-23T00:20:00Z",
"cve": "CVE-2026-68405",
"id": "CVE-2026-68405",
"initial_release_date": "2026-08-13T16:22:10Z",
"product_status:first_fixed": "68",
"product_status:known_affected": "617",
"product_status:known_not_affected": "60",
"product_status:recommended": "130",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-68405",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68405.json",
"version": "11"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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