CVE-2026-74600
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
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.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| df4e817b710809425d899340dbfa8504a3ca4ba5 | affected | git | f6cf9832e677ec07b1675782bd2bad472cfd3cdc | Unavailable | None listed |
| df4e817b710809425d899340dbfa8504a3ca4ba5 | affected | git | 51e16e5adadaa78b56f31a1cb02eb7267787625e | Unavailable | None listed |
| df4e817b710809425d899340dbfa8504a3ca4ba5 | affected | git | 7755be923e325dc300f4b0c3e1ad7e91b28b3cb9 | Unavailable | None listed |
| df4e817b710809425d899340dbfa8504a3ca4ba5 | affected | git | b726eb3c94d23e09da0e0f46b0fa09fb2b5d99cc | Unavailable | None listed |
| df4e817b710809425d899340dbfa8504a3ca4ba5 | affected | git | 8db4bab826ccc9ec10fa41736a48031cd338d392 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 5.17 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 5.17 | Unavailable | None listed |
| 6.6.160 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.114 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.46 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 7.1.9 | unaffected | semver | Unavailable | 7.1.* | None listed |
| 7.2 | unaffected | original_commit_for_fix | Unavailable | * | None listed |