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NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.22% (FIRST EPSS).
  • Fixed version: Linux Linux 0d2619e708e2ef02ba1c91642ea261d3f19d8f9a, 4b8abf43bf34791c99d99dc3be13f897adefc461, 659a81b62a61440b85e02c09903be861ae7679e5; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.150.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0d2619e708e2ef02ba1c91642ea261d3f19d8f9a, 4b8abf43bf34791c99d99dc3be13f897adefc461, 659a81b62a61440b85e02c09903be861ae7679e5; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.150.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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

—No exploit Fix available
Published
Aug 10, 2026
Updated
Aug 19, 2026
EPSS
0.2% · 12th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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  • Not in KEV: no record of exploitation in the wild
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  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 3.9affected
    • 397a7a24ef8c2967a3e8090013f9c54714110c48 and later · before 0d2619e708e2ef02ba1c91642ea261d3f19d8f9aaffected · git
    • 397a7a24ef8c2967a3e8090013f9c54714110c48 and later · before 659a81b62a61440b85e02c09903be861ae7679e5affected · git
    • 397a7a24ef8c2967a3e8090013f9c54714110c48 and later · before aa01ef0ebbc3289154229ef58e65baf289eb9789affected · git
    • 397a7a24ef8c2967a3e8090013f9c54714110c48 and later · before be9dfcb0654c1f6c0fce7ba2a909683bb6f1e0efaffected · git
    • 397a7a24ef8c2967a3e8090013f9c54714110c48 and later · before 962f755a47d7ec3bbf6c709697d7f4c5f798441daffected · git
    • 397a7a24ef8c2967a3e8090013f9c54714110c48 and later · before a424985c3ef2a87ce6057a853e18d0c441a86be8affected · git
    • 397a7a24ef8c2967a3e8090013f9c54714110c48 and later · before 4b8abf43bf34791c99d99dc3be13f897adefc461affected · git
    • 397a7a24ef8c2967a3e8090013f9c54714110c48 and later · before f3858d5b1432098c1936e03d6e03dd0e33facf60affected · git
    • before 3.9not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.187-16.1.187-1
Debian:12linux-6.12before 6.12.101-1~deb12u16.12.101-1~deb12u1
Debian:13linuxbefore 6.12.101-16.12.101-1
Debian:14linuxbefore 7.1.6-17.1.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-68395Aug 10, 2026 · ata: sata_dwc_460ex: enable SATA interrupts only after IRQ handler is registered
    0Monitor
  • ← EarlierCVE-2026-68403Aug 10, 2026 · wifi: brcmfmac: initialize SDIO data work before cleanup
    0Monitor
  • Later →CVE-2026-68406Aug 10, 2026 · wifi: cfg80211: validate PMSR FTM preamble range
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux0d2619e708e2ef02ba1c91642ea261d3f19d8f9aVendor (CNA)
Linux Linux4b8abf43bf34791c99d99dc3be13f897adefc461Vendor (CNA)
Linux Linux659a81b62a61440b85e02c09903be861ae7679e5Vendor (CNA)
Linux Linux962f755a47d7ec3bbf6c709697d7f4c5f798441dVendor (CNA)
Linux Linuxa424985c3ef2a87ce6057a853e18d0c441a86be8Vendor (CNA)
Linux Linuxaa01ef0ebbc3289154229ef58e65baf289eb9789Vendor (CNA)
Linux Linuxbe9dfcb0654c1f6c0fce7ba2a909683bb6f1e0efVendor (CNA)
Linux Linuxf3858d5b1432098c1936e03d6e03dd0e33facf60Vendor (CNA)
azl3 kernel 6.6.143.1-1 on Azure Linux 3.06.6.150.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.101-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records