Kernel compromise via undrained bus reset work
Published Aug 6, 2026 · Updated Aug 6, 2026
Use-after-free in the brcmfmac driver in affected Linux kernels allows attackers to corrupt kernel memory via malicious Wi-Fi traffic. The bus_reset callback recovers and dereferences drvr after device removal frees its enclosing wiphy because teardown does not drain pending or running reset work. Exploitation requires an adjacent 802.11 firmware halt concurrent with USB removal or SDIO suspend and allows kernel reads, control-flow hijacking, or a host crash.
Summary
What happened
Use-after-free in the brcmfmac driver in affected Linux kernels allows attackers to corrupt kernel memory via malicious Wi-Fi traffic. The bus_reset callback recovers and dereferences drvr after device removal frees its enclosing wiphy because teardown does not drain pending or running reset work. Exploitation requires an adjacent 802.11 firmware halt concurrent with USB removal or SDIO suspend and allows kernel reads, control-flow hijacking, or a host crash.
The record
- CVE
- CVE-2026-64586
- Published
- Aug 6, 2026
- Updated
- Aug 6, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1203
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 6, 2026CVE publishedPublication date reported by the CVE source.
- Aug 6, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=4684997d9eea29380000e062755aa6d368d789a3 <177a25be1195f8bdc6160ba5f1a5699f7041c985
- Affected versionversion=4684997d9eea29380000e062755aa6d368d789a3 <43b25879f004c98defa2776bedc6ca4763c51945
- Affected versionversion=5.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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