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CVE-2026-64329— usb: typec: ucsi: ccg: Fix use-after-free of ucsi on remove

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 5.5版本存在安全漏洞，该漏洞源于驱动卸载时释放UCSI对象后，中断处理程序仍可访问已释放的内存，导致释放后重用。

AI Predicted 4.7 Difficulty: Hard EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2< f1adeb1ff8bef1467d6961059810795d02bbad5d affected
e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2< 99381e762273a2410a3f0216000be32b013c0ea9 affected
e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2< 1a160076d3d0dcd4a98a4599ad96eec0790b099b affected
e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2< c32df11147822d22facee8fa30c2e8971d12f426 affected
e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2< 86c9ee928c4a370e323e432aaf8dca79c4ba7c85 affected
e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2< f5c772b76bbd95de8be51cf849c6098f6af6fcf9 affected
e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2< dbb500bad02146b388041877574829016591ddc8 affected
e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2< 1f0bdc2884b67de337215079bba166df0cdf4ac5 affected
… +10 more rows
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I. Basic Information for CVE-2026-64329

Vulnerability Information
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Vulnerability Title
usb: typec: ucsi: ccg: Fix use-after-free of ucsi on remove
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: usb: typec: ucsi: ccg: Fix use-after-free of ucsi on remove The threaded IRQ handler ccg_irq_handler() calls ucsi_notify_common(), which on a connector-change event calls ucsi_connector_change() and schedules connector work. In ucsi_ccg_remove(), ucsi_destroy() frees uc->ucsi (kfree) before free_irq() is called, so a handler invocation already in flight may access the freed object after ucsi_destroy(). CPU 0 (remove) | CPU 1 (threaded IRQ) ucsi_destroy(uc->ucsi) | ccg_irq_handler() kfree(ucsi) // FREE | ucsi_notify_common(uc->ucsi) // USE Move free_irq() before ucsi_destroy() in the remove path. It is kept after ucsi_unregister(): ucsi_unregister() cancels connector work whose handler issues GET_CONNECTOR_STATUS through ucsi_send_command_common(), which waits for a completion that is signalled from the IRQ handler, so the IRQ must stay active until that work has been cancelled. The probe error path already orders free_irq() before ucsi_destroy(). This bug was found by static analysis.
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 5.5版本存在安全漏洞，该漏洞源于驱动卸载时释放UCSI对象后，中断处理程序仍可访问已释放的内存，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

Vendor Product Affected Versions CPE Subscribe
Linux Linux e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2 ~ f1adeb1ff8bef1467d6961059810795d02bbad5d -
Linux Linux 5.5 -

II. Public POCs for CVE-2026-64329

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III. Intelligence Information for CVE-2026-64329

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Patches & Fixes for CVE-2026-64329 (8)

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-2026-64329

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