CVE-2025-71195
Unknown Unknown - Not Provided
Segmentation Fault in Linux dmaengine xdma regmap DebugFS

Publication date: 2026-02-04

Last updated on: 2026-02-04

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: dmaengine: xilinx: xdma: Fix regmap max_register The max_register field is assigned the size of the register memory region instead of the offset of the last register. The result is that reading from the regmap via debugfs can cause a segmentation fault: tail /sys/kernel/debug/regmap/xdma.1.auto/registers Unable to handle kernel paging request at virtual address ffff800082f70000 Mem abort info: ESR = 0x0000000096000007 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x07: level 3 translation fault [...] Call trace: regmap_mmio_read32le+0x10/0x30 _regmap_bus_reg_read+0x74/0xc0 _regmap_read+0x68/0x198 regmap_read+0x54/0x88 regmap_read_debugfs+0x140/0x380 regmap_map_read_file+0x30/0x48 full_proxy_read+0x68/0xc8 vfs_read+0xcc/0x310 ksys_read+0x7c/0x120 __arm64_sys_read+0x24/0x40 invoke_syscall.constprop.0+0x64/0x108 do_el0_svc+0xb0/0xd8 el0_svc+0x38/0x130 el0t_64_sync_handler+0x120/0x138 el0t_64_sync+0x194/0x198 Code: aa1e03e9 d503201f f9400000 8b214000 (b9400000) ---[ end trace 0000000000000000 ]--- note: tail[1217] exited with irqs disabled note: tail[1217] exited with preempt_count 1 Segmentation fault
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Meta Information
Published
2026-02-04
Last Modified
2026-02-04
Generated
2026-06-16
AI Q&A
2026-02-04
EPSS Evaluated
2026-06-15
NVD
CVE-2025-71195
EUVD
EUVD-2025-206803
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
xilinx xdma *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability exists in the Linux kernel's dmaengine driver for Xilinx xdma devices. The issue is that the max_register field is incorrectly assigned the size of the register memory region instead of the offset of the last register.

Because of this incorrect assignment, when reading from the regmap via debugfs, it can cause a segmentation fault, leading to a kernel crash or instability.

Impact Analysis

The vulnerability can cause a segmentation fault when accessing the regmap registers through debugfs, which can lead to a kernel crash or system instability.

This may result in denial of service conditions on affected systems using the Xilinx xdma driver, potentially disrupting normal operations.

Compliance Impact

I don't know

Detection Guidance

This vulnerability can be detected by attempting to read the regmap registers via debugfs for the xilinx xdma device. Specifically, running the command to read the registers file under /sys/kernel/debug/regmap/xdma.1.auto/registers may trigger the issue.

  • Use the command: tail /sys/kernel/debug/regmap/xdma.1.auto/registers

If the vulnerability is present, this command may cause a segmentation fault with kernel paging request errors and a kernel trace similar to the one described in the CVE.

Mitigation Strategies

I don't know

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