CVE-2026-74600
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.
Affected versions
Linux kernel versions
5.17
and later are affected. Fixed in
7.1.9,
7.2
and their respective stable series.
References
2 totalFrequently asked questions
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What is CVE-2026-74600?
CVE-2026-74600 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.17 onward and has been patched in 7.1.9 and 7.2. CVE-2026-74600 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-74600?
Yes. CVE-2026-74600 has been patched. Fixed versions include 7.1.9 and 7.2. If you are running Linux kernel 5.17 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-74600 actively exploited?
No. CVE-2026-74600 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.