# CVE-2025-71195: dmaengine: xilinx: xdma: Fix regmap max_register

> A local attacker can cause a kernel segmentation fault and system crash by reading Xilinx DMA registers via debugfs due to incorrect register bounds.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 4 Feb 2026
- **Updated:** 11 May 2026
- **Also known as:** BELL-CVE-2025-71195, DEBIAN-CVE-2025-71195, GHSA-h592-q89w-8q5r, ROOT-OS-UBUNTU-2204-CVE-2025-71195, ROOT-OS-UBUNTU-2404-CVE-2025-71195, UBUNTU-CVE-2025-71195

## What is CVE-2025-71195?

CVE-2025-71195 is a denial of service vulnerability in Linux, published on 4 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official 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

## Which versions are affected by CVE-2025-71195?


## How do I fix CVE-2025-71195?

Apply the vendor's patch.

## Is CVE-2025-71195 being exploited?

There is no known exploitation of CVE-2025-71195 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-71195 and fix it if it is affected.

What it is: CVE-2025-71195 is a denial of service vulnerability in Linux, published on 4 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-71195 in the wild and no public exploit code.

Affected product: Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-71195/ (Markdown: https://insights.sbomify.com/CVE-2025-71195/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-71195
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-71195
- OSV: https://osv.dev/vulnerability/CVE-2025-71195

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-71195/
Summaries are generated and may contain mistakes; the official description above is the record.