CVE-2025-38195: LoongArch: Fix panic caused by NULL-PMD in huge_pte_offset()

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-07-04 · updated 2026-10-30

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.

Affected products

Linux kernel: from 6.1.136 before 6.2; from 6.6.89 before 6.6.95; from 6.12.26 before 6.12.35; from 6.14.5 before 6.15; from 6.15.1 before 6.15.4; 6.15-rc4, 6.15-rc5, 6.15-rc6, 6.15-rc7 — fixed in 6.2, 6.6.95, 6.12.35, 6.15, 6.15.4
Linux: from 6.1.136 before 6.1.191; from 6.6.89 before 6.6.95; from 6.12.26 before 6.12.35; from 6.14.5 before 6.15 — fixed in 6.1.191, 6.6.95, 6.12.35, 6.15

How to fix

Upgrade to a fixed version: Linux kernel 6.2, 6.6.95, 6.12.35, 6.15; Linux 6.1.191, 6.6.95, 6.12.35, 6.15. Check the vendor advisory for mitigations.

References

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