CVE-2025-38195 LoongArch: Fix panic caused by NULL-PMD in huge_pte_offset()
A local attacker can trigger a kernel panic via madvise on LoongArch systems, causing a denial of service.
- 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
What is CVE-2025-38195?
CVE-2025-38195 is a medium-severity vulnerability in Linux kernel, published on 4 Jul 2025. 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:
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.
Which versions are affected by CVE-2025-38195?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-38195?
Apply the vendor's patch.
Is CVE-2025-38195 being exploited?
There is no known exploitation of CVE-2025-38195 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2025-38195, DEBIAN-CVE-2025-38195, GHSA-qffh-4j5f-8w7g, ROOT-OS-DEBIAN-12-CVE-2025-38195, UBUNTU-CVE-2025-38195.