CVE-2026-64345

mediumCVSS 5.5covered by 2 sourcesfirst seen 2026-07-14

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_printer: take kref only for successful open printer_open() returns -EBUSY when the character device is already open, but it increments dev->kref regardless of the return value. VFS does not call ->release() for a failed open, so every rejected second open permanently leaks one reference. Move kref_get() into the successful-open branch.

CSIRTS triage

Other

What: A kref should only be taken for successful open in f_printer.
Who is affected: Users of the usb gadget f_printer.
Urgency: Remediation urgency is unclear due to unknown severity.
Action: Monitor for updates regarding this issue.

AI-assisted analysis generated from the source advisory — verify against the original.

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Exploitation outlook

Low exploitation risk0.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all EPSS-scored CVEs.

Advisory coverage (2)

unknownCVE-2026-64345: In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_printer: ta…nvd · 2026-07-25
mediumCVE-2026-64345: usb: gadget: f_printer: take kref only for successful openmsrc · 2026-07-14

External references

NVD record for CVE-2026-64345

CVE.org record

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