Device-object retention via failed-open reference leak
Published Jul 25, 2026 · Updated Jul 25, 2026
Reference-counting error in the Linux Kernel USB printer gadget allows local users to retain device references through failed opens. The printer_open() path increments dev->kref even when a second open returns -EBUSY; because VFS skips release after a failed open, each rejection leaks a reference. Reaching the flaw requires local access to the configured USB printer gadget character device, and retained references prevent normal object release.
Summary
What happened
Reference-counting error in the Linux Kernel USB printer gadget allows local users to retain device references through failed opens. The printer_open() path increments dev->kref even when a second open returns -EBUSY; because VFS skips release after a failed open, each rejection leaks a reference. Reaching the flaw requires local access to the configured USB printer gadget character device, and retained references prevent normal object release.
The record
- CVE
- CVE-2026-64345
- Published
- Jul 25, 2026
- Updated
- Jul 25, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- authenticated
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=25c95c6bd4dc50a3c20de0fa7f450ea02b2320fc
- Affected versionversion=34f026263889e2827e04acdc3a0eb9ecbd191ef0
- Affected versionversion=4.14.203 <4.15
- Affected versionversion=4.19.154 <4.20
- Affected versionversion=4.4.241 <4.5
- Affected versionversion=4.9.241 <4.10
- Affected versionversion=4a47581cf010dc351d8069978080fdb000c0776d
- Affected versionversion=5.10
- Affected versionversion=5.4.73 <5.5
- Affected versionversion=5.8.17 <5.9
- Affected versionversion=5.9.2 <5.10
- Affected versionversion=5f845e5d18d151230476cf90aa46449f69ba2ef1
- Affected versionversion=cedb0187b8ba929c3f76f28e6bc25804d65f8a54
- Affected versionversion=d9fe88b2a38dc700bf5bd3a09c7cd11bbc248367
- Affected versionversion=e8d5f92b8d30bb4ade76494490c3c065e12411b1 <30adce93d5c4a5a1ec29d9249e3fdfcc391d406b
- Affected versionversion=e8d5f92b8d30bb4ade76494490c3c065e12411b1 <75c0ad13e136961328253742501b4efc3988a587
- Affected versionversion=e8d5f92b8d30bb4ade76494490c3c065e12411b1 <7f1f24c367938c5537e2308bf9a965f051d14774
- Affected versionversion=e8d5f92b8d30bb4ade76494490c3c065e12411b1 <8a5eba992c862b0c94411eecf9b7121e8636db38
- Affected versionversion=e8d5f92b8d30bb4ade76494490c3c065e12411b1 <94ec20d97aa51547965a539f660a1fe79c6929a3
- Affected versionversion=e8d5f92b8d30bb4ade76494490c3c065e12411b1 <bf20c94fa6aaff945f0ae3a23f3212cd299f28d9
- Affected versionversion=e9e791f5c39ab30e374a3b1a9c25ca7ff24988f3
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
No sourced classifications are available.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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