riscv: mm: Fix out-of-bounds page-table walk during memory hot-remove

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Summary

CVECVE-2026-74524
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 13:17:57 UTC
Updated2026-08-15 13:17:57 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: riscv: mm: Fix out-of-bounds page-table walk during memory hot-remove remove_pud_mapping() and remove_p4d_mapping() obtain a child table base with pud_offset(p4dp, 0) and p4d_offset(pgd, 0), then add the index for addr. RISC-V folds page-table levels at runtime. When a level is folded, its offset helper returns the parent entry itself, but the index can still be nonzero. Adding it walks past the parent table. Sv48 folds P4D, while Sv39 folds both P4D and PUD, so memory hot-remove can descend into unrelated memory and pass an invalid page to __free_pages(). This can trigger: kernel BUG at include/linux/mm.h:1810! VM_BUG_ON_PAGE(page_ref_count(page) == 0) arch_remove_memory+0x1e/0x5c try_remove_memory+0x15e/0x200 remove_memory+0x24/0x3c Only add the index when the corresponding page-table level is enabled, matching p4d_offset() and pud_offset().

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected c75a74f4ba19c904c0ae1e011ae2568449409ae4 1da6d832eda02d908df11a30ba6a856b98a3dd76 git Not specified
CNA Linux Linux affected c75a74f4ba19c904c0ae1e011ae2568449409ae4 54e07a158f7aea2754849d3a5a4cba1ac338ae7e git Not specified
CNA Linux Linux affected c75a74f4ba19c904c0ae1e011ae2568449409ae4 1bb0ef8069ef158d245bac91ac178bb4f1a7ccd2 git Not specified
CNA Linux Linux affected c75a74f4ba19c904c0ae1e011ae2568449409ae4 a0188cc133696627857d16054e43f9ebc7efc821 git Not specified
CNA Linux Linux affected 6.11 Not specified
CNA Linux Linux unaffected 6.11 semver Not specified
CNA Linux Linux unaffected 6.12.103 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc6 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/1da6d832eda02d908df11a30ba6a856b98a3dd76 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1bb0ef8069ef158d245bac91ac178bb4f1a7ccd2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a0188cc133696627857d16054e43f9ebc7efc821 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/54e07a158f7aea2754849d3a5a4cba1ac338ae7e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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