CVE-2026-74600mm/page_table_check: skip special zero mappings
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Aug 23, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from df4e817b710809425d899340dbfa8504a3ca4ba5 before 7755be923e325dc300f4b0c3e1ad7e91b28b3cb9; from df4e817b710809425d899340dbfa8504a3ca4ba5 before b726eb3c94d23e09da0e0f46b0fa09fb2b5d99cc; from df4e817b710809425d899340dbfa8504a3ca4ba5 before 8db4bab826ccc9ec10fa41736a48031cd338d392 | CNA record |
References
- https://git.kernel.org/stable/c/7755be923e325dc300f4b0c3e1ad7e91b28b3cb9
- https://git.kernel.org/stable/c/b726eb3c94d23e09da0e0f46b0fa09fb2b5d99cc
- https://git.kernel.org/stable/c/8db4bab826ccc9ec10fa41736a48031cd338d392
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.