Kernel fault via oversized regmap boundary
Published Feb 4, 2026 · Updated Feb 4, 2026
Out-of-bounds register access in the Linux Kernel XDMA driver allows local users to trigger a kernel fault through debugfs. The driver sets regmap_config.max_register to the mapped region's byte size rather than the last valid register offset, so debugfs iterates one register beyond the mapping. Reaching the fault requires local access to the XDMA regmap debugfs entry on a system with the affected Xilinx DMA driver; the observed consequence is a kernel paging fault and service interruption.
Summary
What happened
Out-of-bounds register access in the Linux Kernel XDMA driver allows local users to trigger a kernel fault through debugfs. The driver sets regmap_config.max_register to the mapped region's byte size rather than the last valid register offset, so debugfs iterates one register beyond the mapping. Reaching the fault requires local access to the XDMA regmap debugfs entry on a system with the affected Xilinx DMA driver; the observed consequence is a kernel paging fault and service interruption.
The record
- CVE
- CVE-2025-71195
- Published
- Feb 4, 2026
- Updated
- Feb 4, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- T1499.004
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 4, 2026CVE publishedPublication date reported by the CVE source.
- Feb 4, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=17ce252266c7f016ece026492c45838f852ddc79 <5e7ad329d259cf5bed7530d6d2525bcf7cb487a1
- Affected versionversion=17ce252266c7f016ece026492c45838f852ddc79 <606ea969e78295407f4bf06aa0e272fe59897184
- Affected versionversion=17ce252266c7f016ece026492c45838f852ddc79 <c7d436a6c1a274c1ac28d5fb3b8eb8f03b6d0e10
- Affected versionversion=17ce252266c7f016ece026492c45838f852ddc79 <df8a131a41ff6202d47f59452735787f2b71dd2d
- Affected versionversion=6.3
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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