usb: gadget: f_printer: take kref only for successful open (CVE-2026-64345) | HOL Guard CVE

Medium · CVSS 5.5CVE-2026-64345

usb: gadget: f_printer: take kref only for successful open

Answer in brief

CVE-2026-64345 records a Medium severity (CVSS 5.5) vulnerability in usb: gadget: f_printer: take kref only for successful open. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jul 25, 2026Updated Sep 3, 2026Source checked Oct 1, 2026First seen by HOL Aug 11, 2026Material review Sep 3, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.5
Exploitation: Not marked as known exploited
Affected software: 5 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
Product	Affected versions	Fixed versions
cpe:2.3:o:linux:linux_kernel::::::::	Not reported	Not reported
cpe:2.3:o:linux:linux_kernel:7.2:rc1::::::	Not reported	Not reported
cpe:2.3:o:linux:linux_kernel:7.2:rc2::::::	Not reported	Not reported

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=e8d5f92b8d30bb4ade76494490c3c065e12411b1 <94ec20d97aa51547965a539f660a1fe79c6929a3 \|\| >=e8d5f92b8d30bb4ade76494490c3c065e12411b1 <75c0ad13e136961328253742501b4efc3988a587 \|\| >=e8d5f92b8d30bb4ade76494490c3c065e12411b1 <bf20c94fa6aaff945f0ae3a23f3212cd299f28d9 \|\| >=e8d5f92b8d30bb4ade76494490c3c065e12411b1 <8a5eba992c862b0c94411eecf9b7121e8636db38 \|\| >=e8d5f92b8d30bb4ade76494490c3c065e12411b1 <7f1f24c367938c5537e2308bf9a965f051d14774 \|\| >=e8d5f92b8d30bb4ade76494490c3c065e12411b1 <30adce93d5c4a5a1ec29d9249e3fdfcc391d406b \|\| 25c95c6bd4dc50a3c20de0fa7f450ea02b2320fc \|\| 4a47581cf010dc351d8069978080fdb000c0776d \|\| d9fe88b2a38dc700bf5bd3a09c7cd11bbc248367 \|\| cedb0187b8ba929c3f76f28e6bc25804d65f8a54 \|\| e9e791f5c39ab30e374a3b1a9c25ca7ff24988f3 \|\| 34f026263889e2827e04acdc3a0eb9ecbd191ef0 \|\| 5f845e5d18d151230476cf90aa46449f69ba2ef1 \|\| >=4.4.241 <4.5 \|\| >=4.9.241 <4.10 \|\| >=4.14.203 <4.15 \|\| >=4.19.154 <4.20 \|\| >=5.4.73 <5.5 \|\| >=5.8.17 <5.9 \|\| >=5.9.2 <5.10	94ec20d97aa51547965a539f660a1fe79c6929a3, 75c0ad13e136961328253742501b4efc3988a587, bf20c94fa6aaff945f0ae3a23f3212cd299f28d9, 8a5eba992c862b0c94411eecf9b7121e8636db38, 7f1f24c367938c5537e2308bf9a965f051d14774, 30adce93d5c4a5a1ec29d9249e3fdfcc391d406b, 4.5, 4.10, 4.15, 4.20, 5.5, 5.9, 5.10
Linux/Linuxgeneric	5.10	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 94ec20d97aa51547965a539f660a1fe79c6929a3 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jul 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 3, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 11, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.