x86/mm: Fix freeing of PMD-sized vmemmap pages

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64302
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-25 10:17:11 UTC
Updated2026-07-25 10:17:11 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: x86/mm: Fix freeing of PMD-sized vmemmap pages Commit bf9e4e30f353 ("x86/mm: use pagetable_free()"), switched from freeing non-boot page tables through __free_pages() to pagetable_free(). However, the function is also called to free vmemmap pages. Given that vmemmap pages are not page tables, already the page_ptdesc(page) is wrong. But worse, pagetable_free() calls: __free_pages(page, compound_order(page)); Since vmemmap pages are not compound pages (see vmemmap_alloc_block()) -- except for HVO, which doesn't apply here -- only first page of a PMD-sized vmemmap page is freed, leaking the other ones. Fix it by properly decoupling pagetable and vmemmap freeing. free_pagetable() no longer has to mess with SECTION_INFO, as only the vmemmap is marked like that in register_page_bootmem_memmap(). The indentation in remove_pmd_table() is messed up. Fix that while touching it. Bootmem info handling will soon be fixed up. For now, handle it similar to free_pagetable(), just avoiding the ifdef. [ dhansen: changelog munging. More imperative voice ]

Risk And Classification

EPSS: 0.001980000 probability, percentile 0.098930000 (date 2026-07-28)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a1593c90896babf33e947910c7aecb9f50bab993 add1e4112e00b619614784bf630aeebfdefa23e1 git Not specified
CNA Linux Linux affected bf9e4e30f3538391745a99bc2268ec4f5e4a401e 03f6ecbc446c33b38fd452cd3c494092a8116967 git Not specified
CNA Linux Linux affected bf9e4e30f3538391745a99bc2268ec4f5e4a401e 39406c05f8f150f1685839acd38ffdd69ff92031 git Not specified
CNA Linux Linux affected 6.18.7 6.18.39 semver Not specified
CNA Linux Linux affected 6.19 Not specified
CNA Linux Linux unaffected 6.19 semver Not specified
CNA Linux Linux unaffected 6.18.39 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.4 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/03f6ecbc446c33b38fd452cd3c494092a8116967 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/39406c05f8f150f1685839acd38ffdd69ff92031 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/add1e4112e00b619614784bf630aeebfdefa23e1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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