mm/page_table_check: skip special zero mappings
In the Linux kernel, the following vulnerability has been resolved: mm/page_table_check: skip special zero mappings page_table_check_set() and page_table_check_clear() account mappings based on PageAnon(). Shared zero-page PTEs and huge zero PMDs are special mappings, but page_table_check can still account them as file-backed pages. An unprivileged process can populate enough zero mappings to overflow file_map_count and hit the existing BUG_ON(). The PTE path can do this with the shared zero page, and the PMD path can do the same with huge zero mappings. Skip special zero mappings in the user page-table accounting paths. Keep the PTE-side pte_special() check, and identify huge zero PMDs from the mapped folio instead of pmd_special(). That covers architectures where pmd_special() is a no-op without adding huge_zero_pfn checks to the generic counter helpers.
CVE-2026-74600
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-2026-74600
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": "df4e817b710809425d899340dbfa8504a3ca4ba5",
"lessThan": "f6cf9832e677ec07b1675782bd2bad472cfd3cdc",
"versionType": "git"
},
{
"status": "affected",
"version": "df4e817b710809425d899340dbfa8504a3ca4ba5",
"lessThan": "51e16e5adadaa78b56f31a1cb02eb7267787625e",
"versionType": "git"
},
{
"status": "affected",
"version": "df4e817b710809425d899340dbfa8504a3ca4ba5",
"lessThan": "7755be923e325dc300f4b0c3e1ad7e91b28b3cb9",
"versionType": "git"
},
{
"status": "affected",
"version": "df4e817b710809425d899340dbfa8504a3ca4ba5",
"lessThan": "b726eb3c94d23e09da0e0f46b0fa09fb2b5d99cc",
"versionType": "git"
},
{
"status": "affected",
"version": "df4e817b710809425d899340dbfa8504a3ca4ba5",
"lessThan": "8db4bab826ccc9ec10fa41736a48031cd338d392",
"versionType": "git"
}
],
"programFiles": [
"mm/page_table_check.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.17"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.17",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.46",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.9",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"mm/page_table_check.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74600
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #46580 · Revision 1
- Added to Heist Feed
- Publisher date