Kernel crash via unsafe reverse teardown iteration
Published Jul 25, 2026 · Updated Jul 25, 2026
Use-after-free in the Linux Kernel usbio driver 6.18 allows physically proximate attackers to crash the kernel during USB disconnect. The usbio_disconnect() teardown walks cli_list with an unsafe reverse iterator after auxiliary_device_uninit() can release and free the current usbio_client, so advancing reads client->link.prev from freed memory. Triggering requires a vulnerable usbio device path and a disconnect or unbind operation; the demonstrated result is a KASAN-detected kernel memory error, not a published code-execution primitive.
Summary
What happened
Use-after-free in the Linux Kernel usbio driver 6.18 allows physically proximate attackers to crash the kernel during USB disconnect. The usbio_disconnect() teardown walks cli_list with an unsafe reverse iterator after auxiliary_device_uninit() can release and free the current usbio_client, so advancing reads client->link.prev from freed memory. Triggering requires a vulnerable usbio device path and a disconnect or unbind operation; the demonstrated result is a KASAN-detected kernel memory error, not a published code-execution primitive.
The record
- CVE
- CVE-2026-64453
- Published
- Jul 25, 2026
- Updated
- Jul 25, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- T1499.004
- Attack vector
- physical
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 25, 2026CVE publishedPublication date reported by the CVE source.
- Jul 25, 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=121a0f839dbb397af5fabb701cea3e9983223e50 <0bfeec21984fedd32987f4e4c0cde34b445af404
- Affected versionversion=121a0f839dbb397af5fabb701cea3e9983223e50 <1947b6411460d68b54b13c536961933166937d05
- Affected versionversion=121a0f839dbb397af5fabb701cea3e9983223e50 <c40090f8d19b415e2925b22be964b5d1f695666f
- Affected versionversion=6.18
What conditions does exploitation require?
What is affected?
Published CVSS scores
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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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