Kernel memory corruption via unanchored capture URBs
Published Aug 22, 2026 · Updated Aug 22, 2026
Use-after-free in the Linux ALSA us144mkii driver 6.18.39 through 6.18.44 and 7.1.4 through 7.1.8 allows local users to corrupt kernel memory. After the first completion, capture_urb_complete() resubmits a capture URB without re-anchoring it, so teardown frees its buffer and driver object while the URB remains queued. Exploitation requires local access to an active TASCAM US-144MKII capture stream and a disconnect, suspend, or stop path; later completion writes to and reads from freed kernel memory.
Summary
What happened
Use-after-free in the Linux ALSA us144mkii driver 6.18.39 through 6.18.44 and 7.1.4 through 7.1.8 allows local users to corrupt kernel memory. After the first completion, capture_urb_complete() resubmits a capture URB without re-anchoring it, so teardown frees its buffer and driver object while the URB remains queued. Exploitation requires local access to an active TASCAM US-144MKII capture stream and a disconnect, suspend, or stop path; later completion writes to and reads from freed kernel memory.
The record
- CVE
- CVE-2026-74639
- Published
- Aug 22, 2026
- Updated
- Aug 22, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-825, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 22, 2026CVE publishedPublication date reported by the CVE source.
- Aug 22, 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?
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- Affected versionversion=16f14f55141d4c55c3f321f93c328fff7cd6860a <7779249561d14b8a17c0c83783225794e24a587d
- Affected versionversion=5cff1529a2f9b3461a7f5a6e36a86682fc290534 <2615f0fb90df8cf5a96133ca4be74294ed288604
- Affected versionversion=6.18.39 <6.18.45
- Affected versionversion=7.1.4 <7.1.9
- Affected versionversion=ab1db64912428cdf06a4f9542e16e0575e9ad59f <a5548ce916594c811bd90ce33d67baa3557a6791
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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Technologies
Your stack
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Your stack
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