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CVE-2026-64280— fpga: dfl-afu: validate DMA mapping length in afu_dma_map_region()

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afu_ioctl_dma_map()函数对DMA映射长度缺少上限检查，可能导致整数截断。

CVSS 8.8 · High EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux fa8dda1edef9ebc3af467c644c5533ac97171e12< 5352d488ce4ae5e8c68c080ad4c3a5f084ad5fbc affected
fa8dda1edef9ebc3af467c644c5533ac97171e12< d7e787eee2ea619b6dbb98890472ee73daf2e7fd affected
fa8dda1edef9ebc3af467c644c5533ac97171e12< a6a3884ff500f04f3088d6d09eec803cd35331a2 affected
fa8dda1edef9ebc3af467c644c5533ac97171e12< 16381bda90b261a656ded0568630c1b857b2ebc8 affected
fa8dda1edef9ebc3af467c644c5533ac97171e12< b50e6cd2395cde615f59b624819998d28c0668d6 affected
fa8dda1edef9ebc3af467c644c5533ac97171e12< 59070040fd12e0b78d7b4d341d9f9a183237c5ff affected
fa8dda1edef9ebc3af467c644c5533ac97171e12< fb2c0eab51ae5b02d2bae7d67c2cfbec39b57231 affected
fa8dda1edef9ebc3af467c644c5533ac97171e12< fc3b071a7c8dc0f5d56defddf6e6fd5aaa3e1e27 affected
… +10 more rows
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I. Basic Information for CVE-2026-64280

Vulnerability Information
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Vulnerability Title
fpga: dfl-afu: validate DMA mapping length in afu_dma_map_region()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: fpga: dfl-afu: validate DMA mapping length in afu_dma_map_region() afu_ioctl_dma_map() accepts a 64-bit length from userspace via DFL_FPGA_PORT_DMA_MAP ioctl without an upper bound check. The value is passed to afu_dma_pin_pages() where npages is derived as length >> PAGE_SHIFT and passed to pin_user_pages_fast() which takes int nr_pages, causing implicit truncation if length is very large. Validate map.length at the ioctl entry point before calling afu_dma_map_region(), rejecting values whose page count exceeds INT_MAX.
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afu_ioctl_dma_map()函数对DMA映射长度缺少上限检查，可能导致整数截断。
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 fa8dda1edef9ebc3af467c644c5533ac97171e12 ~ 5352d488ce4ae5e8c68c080ad4c3a5f084ad5fbc -
Linux Linux 4.19 -

II. Public POCs for CVE-2026-64280

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III. Intelligence Information for CVE-2026-64280

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Patches & Fixes for CVE-2026-64280 (6)

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-2026-64257 9.1 CRITICAL smb: client: reject overlapping data areas in SMB2 responses
CVE-2026-64393 9.1 CRITICAL ksmbd: run set info with opener credentials
CVE-2026-64392 9.1 CRITICAL ksmbd: use opener credentials for delete-on-close
CVE-2026-64269 9.1 CRITICAL RDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg
CVE-2026-64450 9.1 CRITICAL tipc: fix out-of-bounds read in broadcast Gap ACK blocks

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-2026-64280

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