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CVE-2026-64343— USB: ldusb: fix use-after-free on disconnect race

AI Predicted 7.8 Difficulty: Moderate EPSS 0.18% · P7

Possible ATT&CK Techniques 1AI

T1211 · Exploitation for Stealth

Affected Version Matrix 18

VendorProductVersion RangeStatus
LinuxLinuxce0d7d3f575fc1ba6a89c3c651e710355590daff< fc55923a972e715f9a27187b47d4920709e23d85affected
ce0d7d3f575fc1ba6a89c3c651e710355590daff< e5a9bdce4bfd3e2226b5f3df5fb8385d6935ee69affected
ce0d7d3f575fc1ba6a89c3c651e710355590daff< af59829e67e11ba2511a9f8e4b9111afc7d1f550affected
ce0d7d3f575fc1ba6a89c3c651e710355590daff< 02ca08fff74cf9b0a3c4d2cacde1c6edeeb95bb4affected
ce0d7d3f575fc1ba6a89c3c651e710355590daff< d8f69404e1d671326f86d378b9f5bfbd56490e9daffected
ce0d7d3f575fc1ba6a89c3c651e710355590daff< 2107a4fc8ff1cf1d52f416c1e5cc8e97413a5915affected
ce0d7d3f575fc1ba6a89c3c651e710355590daff< a3e794136ab5e3ad1e7019175a4b837aec86db4baffected
ce0d7d3f575fc1ba6a89c3c651e710355590daff< 19bdfc7b3c179331eafa423d87e1336f43bbfeb8affected
… +10 more rows
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I. Basic Information for CVE-2026-64343

Vulnerability Information
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Vulnerability Title
USB: ldusb: fix use-after-free on disconnect race
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: USB: ldusb: fix use-after-free on disconnect race mutex_unlock() may access the mutex structure after releasing the lock and therefore cannot be used to manage lifetime of objects directly (unlike spinlocks and refcounts). [1][2] Use a kref to release the driver data to avoid use-after-free in mutex_unlock() when release() races with disconnect(). [1] a51749ab34d9 ("locking/mutex: Document that mutex_unlock() is non-atomic") [2] 2b9d9e0a9ba0 ("locking/mutex: Clarify that mutex_unlock(), and most other sleeping locks, can still use the lock object after it's unlocked")
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 2.6.26版本存在安全漏洞，该漏洞源于USB ldusb驱动在断连竞争时mutex_unlock释放锁后访问互斥体结构，可能导致释放后重用。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux ce0d7d3f575fc1ba6a89c3c651e710355590daff ~ fc55923a972e715f9a27187b47d4920709e23d85 -
LinuxLinux 2.6.26 -

II. Public POCs for CVE-2026-64343

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III. Intelligence Information for CVE-2026-64343

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Patches & Fixes for CVE-2026-64343 (8)

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

CVE-2026-643559.8 CRITICALbpf: Reject fragmented frames in devmap
CVE-2026-644599.8 CRITICALtcp: restore RCU grace period in tcp_ao_destroy_sock
CVE-2026-643039.8 CRITICALspi: fsl-lpspi: terminate the RX channel on TX prepare failure path
CVE-2026-644399.8 CRITICALcrypto: krb5 - filter out async aead implementations at alloc
CVE-2026-644109.8 CRITICALnetfilter: flowtable: IPIP tunnel hardware offload is not yet support
CVE-2026-643999.8 CRITICALksmbd: add permission checks for FSCTL_DUPLICATE_EXTENTS_TO_FILE
CVE-2026-643979.8 CRITICALksmbd: serialize QUERY_DIRECTORY requests per file
CVE-2026-643919.8 CRITICALksmbd: use opener credentials for ADS I/O
CVE-2026-643879.8 CRITICALsmb: client: fix query directory replay double-free
CVE-2026-643869.8 CRITICALsmb: client: fix query_info() replay double-free
CVE-2026-643859.8 CRITICALsmb: client: fix double-free in SMB2_ioctl() replay
CVE-2026-643839.8 CRITICALsmb: client: fix double-free in SMB2_flush() replay
CVE-2026-643849.8 CRITICALsmb: client: fix change notify replay double-free
CVE-2026-642689.8 CRITICALRDMA/siw: bound Read Response placement to the RREAD length
CVE-2026-645239.8 CRITICALnet/handshake: Take a long-lived file reference at submit
CVE-2026-642699.1 CRITICALRDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg
CVE-2026-642579.1 CRITICALsmb: client: reject overlapping data areas in SMB2 responses
CVE-2026-643199.1 CRITICALnvmet-auth: validate reply message payload bounds against transfer length
CVE-2026-643209.1 CRITICALnvmet: fix pre-auth out-of-bounds heap read in Discovery Get Log Page
CVE-2026-643939.1 CRITICALksmbd: 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-2026-64343

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