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CVE-2026-64475— vfio/pci: Release the VGA arbiter client on register_device() failure

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vfio_pci_core_register_device()在失败时未释放VGA仲裁客户端，可能导致回调使用已释放的vdev cookie。

CVSS 8.8 · High EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 23

VendorProduct Version RangeStatus
Linux Linux 87856f9af04eaacf9848710625a4ffee1d020fa9< 0f2a35a0c7ea7da347b814750eaa78adf3582381 affected
4aeec3984ddc853f7c65903bde472ffdef738bae< 8d65decde9afd2bd78bcfffdc0df73b82a0b5509 affected
4aeec3984ddc853f7c65903bde472ffdef738bae< ef4c38d30b3744e89eb5048218904bb629ea8d47 affected
4aeec3984ddc853f7c65903bde472ffdef738bae< 9e0a3f642e607848669235f5069f35640abbfc88 affected
4aeec3984ddc853f7c65903bde472ffdef738bae< 42d758a09d2c46c42357ecde9a5492f015bde2e5 affected
4aeec3984ddc853f7c65903bde472ffdef738bae< 52adb2dff7ce3d8430e2bdc5988b618a430def85 affected
4aeec3984ddc853f7c65903bde472ffdef738bae< 278a5659c391fe5afe5f9ce1bad1fd24e90144f1 affected
4aeec3984ddc853f7c65903bde472ffdef738bae< daedde7f024ecf88bc8e832ed40cf2c795f0796a affected
… +15 more rows
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I. Basic Information for CVE-2026-64475

Vulnerability Information
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Vulnerability Title
vfio/pci: Release the VGA arbiter client on register_device() failure
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: vfio/pci: Release the VGA arbiter client on register_device() failure The re-order in the Fixes commit below displaced vfio_pci_vga_init() as the last failure point of what is now vfio_pci_core_register_device() without introducing an unwind for the VGA arbiter registration. In current kernels this is mostly benign because vfio_pci_set_decode() only uses pci_dev state, but the original failure path could leave a callback with a freed vdev cookie. The stale registration also becomes unsafe again once the callback follows drvdata to the vfio device. Add the required VGA unwind callout.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
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vfio_pci_core_register_device()在失败时未释放VGA仲裁客户端，可能导致回调使用已释放的vdev cookie。
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 87856f9af04eaacf9848710625a4ffee1d020fa9 ~ 0f2a35a0c7ea7da347b814750eaa78adf3582381 -
Linux Linux 5.13 -

II. Public POCs for CVE-2026-64475

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-64475

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Patches & Fixes for CVE-2026-64475 (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-2026-64475

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