CVE-2026-74600
CVE CVE-2026-74600EUVD EUVD-2026-64537Published 2026-08-22T15:31:49.000ZLast changed 2026-08-23T12:47:40.000Z
What the advisory describes
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.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux patch: 7.2; df4e817b710809425d899340dbfa8504a3ca4ba5 <8db4bab826ccc9ec10fa41736a48031cd338d392; df4e817b710809425d899340dbfa8504a3ca4ba5 <b726eb3c94d23e09da0e0f46b0fa09fb2b5d99cc; 5.17; patch: 7.1.9; df4e817b710809425d899340dbfa8504a3ca4ba5 <7755be923e325dc300f4b0c3e1ad7e91b28b3cb9; patch: 6.18.46; patch: 0
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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