n the Linux kernel, the following vulnerability has been resolved: mm/userfaultfd: fix kmap_local LIFO ordering for CONFIG_HIGHPTE With CONFIG_HIGHPTE on 32-bit ARM, move_pages_pte() maps PTE pages using kmap_local_page(), which requires unmapping in Last-In-First-Out order. The current code maps dst_pte first, then src_pte, but unmaps them in the same order (dst_pte, src_pte), violating the LIFO requirement. This causes the warning in kunmap_local_indexed(): WARNING: CPU: 0 PID: 604 at mm/highmem.c:622 kunmap_local_indexed+0x178/0x17c addr \!= __fix_to_virt(FIX_KMAP_BEGIN + idx) Fix this by reversing the unmap order to respect LIFO ordering. This issue follows the same pattern as similar fixes: - commit eca6828403b8 ("crypto: skcipher - fix mismatch between mapping and unmapping order") - commit 8cf57c6df818 ("nilfs2: eliminate staggered calls to kunmap in nilfs_rename") Both of which addressed the same fundamental requirement that kmap_local operations must follow LIFO ordering.
Configuration 1 (hide)
|
12 Dec 2025, 18:42
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| CWE | NVD-CWE-noinfo | |
| First Time |
Linux linux Kernel
Linux |
|
| CPE | cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:* |
|
| References | () https://git.kernel.org/stable/c/9614d8bee66387501f48718fa306e17f2aa3f2f3 - Patch | |
| References | () https://git.kernel.org/stable/c/b051f707018967ea8f697d790a1ed8c443f63812 - Patch | |
| References | () https://git.kernel.org/stable/c/bd1ee62759d0bd4d6b909731c076c230ac89d61e - Patch |
02 Oct 2025, 19:12
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Published : 2025-10-01 08:15
Updated : 2026-01-14 20:16
NVD link : CVE-2025-39899
Mitre link : CVE-2025-39899
CVE.ORG link : CVE-2025-39899
JSON object : View