{"api_version":"1","generated_at":"2026-08-16T06:03:07+00:00","cve":"CVE-2026-74524","urls":{"html":"https://cve.report/CVE-2026-74524","api":"https://cve.report/api/cve/CVE-2026-74524.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74524","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74524"},"summary":{"title":"riscv: mm: Fix out-of-bounds page-table walk during memory hot-remove","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: mm: Fix out-of-bounds page-table walk during memory hot-remove\n\nremove_pud_mapping() and remove_p4d_mapping() obtain a child table base\nwith pud_offset(p4dp, 0) and p4d_offset(pgd, 0), then add the index for\naddr.\n\nRISC-V folds page-table levels at runtime. When a level is folded, its\noffset helper returns the parent entry itself, but the index can still be\nnonzero. Adding it walks past the parent table. Sv48 folds P4D, while Sv39\nfolds both P4D and PUD, so memory hot-remove can descend into unrelated\nmemory and pass an invalid page to __free_pages(). This can trigger:\n\n  kernel BUG at include/linux/mm.h:1810!\n  VM_BUG_ON_PAGE(page_ref_count(page) == 0)\n  arch_remove_memory+0x1e/0x5c\n  try_remove_memory+0x15e/0x200\n  remove_memory+0x24/0x3c\n\nOnly add the index when the corresponding page-table level is enabled,\nmatching p4d_offset() and pud_offset().","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 13:17:57","updated_at":"2026-08-15 13:17:57"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/1da6d832eda02d908df11a30ba6a856b98a3dd76","name":"https://git.kernel.org/stable/c/1da6d832eda02d908df11a30ba6a856b98a3dd76","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1bb0ef8069ef158d245bac91ac178bb4f1a7ccd2","name":"https://git.kernel.org/stable/c/1bb0ef8069ef158d245bac91ac178bb4f1a7ccd2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a0188cc133696627857d16054e43f9ebc7efc821","name":"https://git.kernel.org/stable/c/a0188cc133696627857d16054e43f9ebc7efc821","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/54e07a158f7aea2754849d3a5a4cba1ac338ae7e","name":"https://git.kernel.org/stable/c/54e07a158f7aea2754849d3a5a4cba1ac338ae7e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74524","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74524","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c75a74f4ba19c904c0ae1e011ae2568449409ae4 1da6d832eda02d908df11a30ba6a856b98a3dd76 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c75a74f4ba19c904c0ae1e011ae2568449409ae4 54e07a158f7aea2754849d3a5a4cba1ac338ae7e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c75a74f4ba19c904c0ae1e011ae2568449409ae4 1bb0ef8069ef158d245bac91ac178bb4f1a7ccd2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c75a74f4ba19c904c0ae1e011ae2568449409ae4 a0188cc133696627857d16054e43f9ebc7efc821 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.11","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.11 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.103 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.44 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.8 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc6 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["arch/riscv/mm/init.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"1da6d832eda02d908df11a30ba6a856b98a3dd76","status":"affected","version":"c75a74f4ba19c904c0ae1e011ae2568449409ae4","versionType":"git"},{"lessThan":"54e07a158f7aea2754849d3a5a4cba1ac338ae7e","status":"affected","version":"c75a74f4ba19c904c0ae1e011ae2568449409ae4","versionType":"git"},{"lessThan":"1bb0ef8069ef158d245bac91ac178bb4f1a7ccd2","status":"affected","version":"c75a74f4ba19c904c0ae1e011ae2568449409ae4","versionType":"git"},{"lessThan":"a0188cc133696627857d16054e43f9ebc7efc821","status":"affected","version":"c75a74f4ba19c904c0ae1e011ae2568449409ae4","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["arch/riscv/mm/init.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.11"},{"lessThan":"6.11","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.103","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.44","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.8","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc6","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.103","versionStartIncluding":"6.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.44","versionStartIncluding":"6.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.8","versionStartIncluding":"6.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc6","versionStartIncluding":"6.11","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: mm: Fix out-of-bounds page-table walk during memory hot-remove\n\nremove_pud_mapping() and remove_p4d_mapping() obtain a child table base\nwith pud_offset(p4dp, 0) and p4d_offset(pgd, 0), then add the index for\naddr.\n\nRISC-V folds page-table levels at runtime. When a level is folded, its\noffset helper returns the parent entry itself, but the index can still be\nnonzero. Adding it walks past the parent table. Sv48 folds P4D, while Sv39\nfolds both P4D and PUD, so memory hot-remove can descend into unrelated\nmemory and pass an invalid page to __free_pages(). This can trigger:\n\n  kernel BUG at include/linux/mm.h:1810!\n  VM_BUG_ON_PAGE(page_ref_count(page) == 0)\n  arch_remove_memory+0x1e/0x5c\n  try_remove_memory+0x15e/0x200\n  remove_memory+0x24/0x3c\n\nOnly add the index when the corresponding page-table level is enabled,\nmatching p4d_offset() and pud_offset()."}],"providerMetadata":{"dateUpdated":"2026-08-15T12:27:41.735Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/1da6d832eda02d908df11a30ba6a856b98a3dd76"},{"url":"https://git.kernel.org/stable/c/54e07a158f7aea2754849d3a5a4cba1ac338ae7e"},{"url":"https://git.kernel.org/stable/c/1bb0ef8069ef158d245bac91ac178bb4f1a7ccd2"},{"url":"https://git.kernel.org/stable/c/a0188cc133696627857d16054e43f9ebc7efc821"}],"title":"riscv: mm: Fix out-of-bounds page-table walk during memory hot-remove","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74524","datePublished":"2026-08-15T12:27:41.735Z","dateReserved":"2026-08-15T05:44:03.911Z","dateUpdated":"2026-08-15T12:27:41.735Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 13:17:57","lastModifiedDate":"2026-08-15 13:17:57","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74524","Ordinal":"1","Title":"riscv: mm: Fix out-of-bounds page-table walk during memory hot-r","CVE":"CVE-2026-74524","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74524","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: mm: Fix out-of-bounds page-table walk during memory hot-remove\n\nremove_pud_mapping() and remove_p4d_mapping() obtain a child table base\nwith pud_offset(p4dp, 0) and p4d_offset(pgd, 0), then add the index for\naddr.\n\nRISC-V folds page-table levels at runtime. When a level is folded, its\noffset helper returns the parent entry itself, but the index can still be\nnonzero. Adding it walks past the parent table. Sv48 folds P4D, while Sv39\nfolds both P4D and PUD, so memory hot-remove can descend into unrelated\nmemory and pass an invalid page to __free_pages(). This can trigger:\n\n  kernel BUG at include/linux/mm.h:1810!\n  VM_BUG_ON_PAGE(page_ref_count(page) == 0)\n  arch_remove_memory+0x1e/0x5c\n  try_remove_memory+0x15e/0x200\n  remove_memory+0x24/0x3c\n\nOnly add the index when the corresponding page-table level is enabled,\nmatching p4d_offset() and pud_offset().","Type":"Description","Title":"riscv: mm: Fix out-of-bounds page-table walk during memory hot-r"}]}}}