x86/mm/64: define ARCH_PAGE_TABLE_SYNC_MASK and arch_sync_kernel_mappings()
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+0x34/0x
CVE-2025-39845
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2025-39845
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "8d400913c231bd1da74067255816453f96cd35b0",
"lessThan": "744ff519c72de31344a627eaf9b24e9595aae554",
"versionType": "git"
},
{
"status": "affected",
"version": "8d400913c231bd1da74067255816453f96cd35b0",
"lessThan": "5f761d40ee95d2624f839c90ebeef2d5c55007f5",
"versionType": "git"
},
{
"status": "affected",
"version": "8d400913c231bd1da74067255816453f96cd35b0",
"lessThan": "26ff568f390a531d1bd792e49f1a401849921960",
"versionType": "git"
},
{
"status": "affected",
"version": "8d400913c231bd1da74067255816453f96cd35b0",
"lessThan": "b7f4051dd3388edd30e9a6077c05c486aa31e0d4",
"versionType": "git"
},
{
"status": "affected",
"version": "8d400913c231bd1da74067255816453f96cd35b0",
"lessThan": "6bf9473727569e8283c1e2445c7ac42cf4fc9fa9",
"versionType": "git"
},
{
"status": "affected",
"version": "8d400913c231bd1da74067255816453f96cd35b0",
"lessThan": "6659d027998083fbb6d42a165b0c90dc2e8ba989",
"versionType": "git"
}
],
"programFiles": [
"arch/x86/include/asm/pgtable_64_types.h",
"arch/x86/mm/init_64.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.13"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.13",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.15.192",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.151",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.105",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.46",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.16.6",
"versionType": "semver",
"lessThanOrEqual": "6.16.*"
},
{
"status": "unaffected",
"version": "6.17",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"arch/x86/include/asm/pgtable_64_types.h",
"arch/x86/mm/init_64.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-39845
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #27072 · Revision 1
- Added to Heist Feed
- Publisher date