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CVE-2026-64345— usb: gadget: f_printer: take kref only for successful open

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于printer_open()函数在设备已打开时返回-EBUSY，但依然增加了kref引用计数，导致每次拒绝打开都会泄漏一个引用。

AI Predicted 3.7 Difficulty: Hard EPSS 0.12% · P2

Affected Version Matrix 28

VendorProduct Version RangeStatus
Linux Linux e8d5f92b8d30bb4ade76494490c3c065e12411b1< 94ec20d97aa51547965a539f660a1fe79c6929a3 affected
e8d5f92b8d30bb4ade76494490c3c065e12411b1< 75c0ad13e136961328253742501b4efc3988a587 affected
e8d5f92b8d30bb4ade76494490c3c065e12411b1< bf20c94fa6aaff945f0ae3a23f3212cd299f28d9 affected
e8d5f92b8d30bb4ade76494490c3c065e12411b1< 8a5eba992c862b0c94411eecf9b7121e8636db38 affected
e8d5f92b8d30bb4ade76494490c3c065e12411b1< 7f1f24c367938c5537e2308bf9a965f051d14774 affected
e8d5f92b8d30bb4ade76494490c3c065e12411b1< 30adce93d5c4a5a1ec29d9249e3fdfcc391d406b affected
25c95c6bd4dc50a3c20de0fa7f450ea02b2320fc affected
4a47581cf010dc351d8069978080fdb000c0776d affected
… +20 more rows
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I. Basic Information for CVE-2026-64345

Vulnerability Information
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Vulnerability Title
usb: gadget: f_printer: take kref only for successful open
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于printer_open()函数在设备已打开时返回-EBUSY，但依然增加了kref引用计数，导致每次拒绝打开都会泄漏一个引用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux e8d5f92b8d30bb4ade76494490c3c065e12411b1 ~ 94ec20d97aa51547965a539f660a1fe79c6929a3 -
Linux Linux 5.10 -

II. Public POCs for CVE-2026-64345

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III. Intelligence Information for CVE-2026-64345

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Patches & Fixes for CVE-2026-64345 (5)

Same Patch Batch · Linux · 2026-07-25 · 274 CVEs total

CVE-2026-64355 9.8 CRITICAL bpf: Reject fragmented frames in devmap
CVE-2026-64459 9.8 CRITICAL tcp: restore RCU grace period in tcp_ao_destroy_sock
CVE-2026-64303 9.8 CRITICAL spi: fsl-lpspi: terminate the RX channel on TX prepare failure path
CVE-2026-64439 9.8 CRITICAL crypto: krb5 - filter out async aead implementations at alloc
CVE-2026-64410 9.8 CRITICAL netfilter: flowtable: IPIP tunnel hardware offload is not yet support
CVE-2026-64399 9.8 CRITICAL ksmbd: add permission checks for FSCTL_DUPLICATE_EXTENTS_TO_FILE
CVE-2026-64397 9.8 CRITICAL ksmbd: serialize QUERY_DIRECTORY requests per file
CVE-2026-64391 9.8 CRITICAL ksmbd: use opener credentials for ADS I/O
CVE-2026-64387 9.8 CRITICAL smb: client: fix query directory replay double-free
CVE-2026-64386 9.8 CRITICAL smb: client: fix query_info() replay double-free
CVE-2026-64385 9.8 CRITICAL smb: client: fix double-free in SMB2_ioctl() replay
CVE-2026-64383 9.8 CRITICAL smb: client: fix double-free in SMB2_flush() replay
CVE-2026-64384 9.8 CRITICAL smb: client: fix change notify replay double-free
CVE-2026-64268 9.8 CRITICAL RDMA/siw: bound Read Response placement to the RREAD length
CVE-2026-64523 9.8 CRITICAL net/handshake: Take a long-lived file reference at submit
CVE-2026-64269 9.1 CRITICAL RDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg
CVE-2026-64257 9.1 CRITICAL smb: client: reject overlapping data areas in SMB2 responses
CVE-2026-64319 9.1 CRITICAL nvmet-auth: validate reply message payload bounds against transfer length
CVE-2026-64320 9.1 CRITICAL nvmet: fix pre-auth out-of-bounds heap read in Discovery Get Log Page
CVE-2026-64393 9.1 CRITICAL ksmbd: run set info with opener credentials

Showing top 20 of 274 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64345

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