cbcvebase.
CVE-2025-39845
published 2025-09-19

CVE-2025-39845: In the Linux kernel, the following vulnerability has been resolved: x86/mm/64: define ARCH_PAGE_TABLE_SYNC_MASK and arch_sync_kernel_mappings() Define…

medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
In the Linux kernel, the following vulnerability has been resolved: x86/mm/64: define ARCH_PAGE_TABLE_SYNC_MASK and arch_sync_kernel_mappings() Define ARCH_PAGE_TABLE_SYNC_MASK and arch_sync_kernel_mappings() to ensure page tables are properly synchronized when calling p*d_populate_kernel(). For 5-level paging, synchronization is performed via pgd_populate_kernel(). In 4-level paging, pgd_populate() is a no-op, so synchronization is instead performed at the P4D level via p4d_populate_kernel(). This fixes intermittent boot failures on systems using 4-level paging and a large amount of persistent memory: BUG: unable to handle page fault for address: ffffe70000000034 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 0 P4D 0 Oops: 0002 [#1] SMP NOPTI RIP: 0010:__init_single_page+0x9/0x6d Call Trace: __init_zone_device_page+0x17/0x5d memmap_init_zone_device+0x154/0x1bb pagemap_range+0x2e0/0x40f memremap_pages+0x10b/0x2f0 devm_memremap_pages+0x1e/0x60 dev_dax_probe+0xce/0x2ec [device_dax] dax_bus_probe+0x6d/0xc9 [... snip ...] It also fixes a crash in vmemmap_set_pmd() caused by accessing vmemmap before sync_global_pgds() [1]: BUG: unable to handle page fault for address: ffffeb3ff1200000 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 0 P4D 0 Oops: Oops: 0002 [#1] PREEMPT SMP NOPTI Tainted: [W]=WARN RIP: 0010:vmemmap_set_pmd+0xff/0x230 vmemmap_populate_hugepages+0x176/0x180 vmemmap_populate+0x34/0x80 __populate_section_memmap+0x41/0x90 sparse_add_section+0x121/0x3e0 __add_pages+0xba/0x150 add_pages+0x1d/0x70 memremap_pages+0x3dc/0x810 devm_memremap_pages+0x1c/0x60 xe_devm_add+0x8b/0x100 [xe] xe_tile_init_noalloc+0x6a/0x70 [xe] xe_device_probe+0x48c/0x740 [xe] [... snip ...]

Affected

25 ranges
VendorProductVersion rangeFixed in
debiandebian_linux——
debianlinux< linux 6.1.153-1 (bookworm)linux 6.1.153-1 (bookworm)
debianlinux-6.1< linux 6.1.153-1 (bookworm)linux 6.1.153-1 (bookworm)
linuxlinux——
linuxlinux>= 8d400913c231bd1da74067255816453f96cd35b0 < 744ff519c72de31344a627eaf9b24e9595aae554744ff519c72de31344a627eaf9b24e9595aae554
linuxlinux>= 8d400913c231bd1da74067255816453f96cd35b0 < 5f761d40ee95d2624f839c90ebeef2d5c55007f55f761d40ee95d2624f839c90ebeef2d5c55007f5
linuxlinux>= 8d400913c231bd1da74067255816453f96cd35b0 < 26ff568f390a531d1bd792e49f1a40184992196026ff568f390a531d1bd792e49f1a401849921960
linuxlinux>= 8d400913c231bd1da74067255816453f96cd35b0 < b7f4051dd3388edd30e9a6077c05c486aa31e0d4b7f4051dd3388edd30e9a6077c05c486aa31e0d4
linuxlinux>= 8d400913c231bd1da74067255816453f96cd35b0 < 6bf9473727569e8283c1e2445c7ac42cf4fc9fa96bf9473727569e8283c1e2445c7ac42cf4fc9fa9
linuxlinux>= 8d400913c231bd1da74067255816453f96cd35b0 < 6659d027998083fbb6d42a165b0c90dc2e8ba9896659d027998083fbb6d42a165b0c90dc2e8ba989
linuxlinux_kernel——
linuxlinux_kernel>= 0 < 6.1.153-16.1.153-1
linuxlinux_kernel>= 0 < 6.12.48-16.12.48-1
linuxlinux_kernel>= 0 < 6.16.6-16.16.6-1
linuxlinux_kernel>= 0 < 5.15.0-163.1735.15.0-163.173
linuxlinux_kernel>= 0 < 6.8.0-106.1066.8.0-106.106
linuxlinux_kernel>= 5.13 < 5.15.1925.15.192
linuxlinux_kernel>= 5.16 < 6.1.1516.1.151
linuxlinux_kernel>= 6.13 < 6.16.66.16.6
linuxlinux_kernel>= 6.2 < 6.6.1056.6.105
linuxlinux_kernel>= 6.7 < 6.12.466.12.46
msrcazl3_kernel_6.6.104.2-4_on_azure_linux_3.0——
msrcazl3_kernel_6.6.96.2-2_on_azure_linux_3.0——
msrccbl2_kernel_5.15.186.1-1_on_cbl_mariner_2.0——
ubuntulinux-xilinx——

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.5MEDIUM