{"api_version":"1","generated_at":"2026-10-02T17:33:21+00:00","cve":"CVE-2026-93239","urls":{"html":"https://cve.report/CVE-2026-93239","api":"https://cve.report/api/cve/CVE-2026-93239.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-93239","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-93239"},"summary":{"title":"arm64: mm: Fix the lockless page-table walk in show_pte()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\narm64: mm: Fix the lockless page-table walk in show_pte()\n\nshow_pte() walks page tables locklessly and can run with interrupts\nenabled. A concurrent teardown can free a table page while it is being\nwalked. It can also clear a parent entry after show_pte() checked it; the\nregular pXd_offset() helpers then reread the cleared entry and can derive a\nbogus lower-level pointer and fault again.\n\nUse the lockless offset helpers with the saved parent entries, as\ngup_fast() does, and pass the saved PMD to pte_offset_map().\n\nFor task page tables, arm64 selects MMU_GATHER_RCU_TABLE_FREE. Disable\nlocal interrupts around the walk to hold off RCU-deferred table frees and\nblock the tlb_remove_table_sync_one() IPI until the walk is finished.\n\nPlace the IRQ guard after the header print. This does not make the output a\nconsistent snapshot, but prevents the task page-table walk from\ndereferencing a released table page or deriving a pointer from a different\nparent value.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-24 16:17:19","updated_at":"2026-09-24 16:17:19"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/68cbd70795dd8c06e7ccdc4eb0b74c5b180076c3","name":"https://git.kernel.org/stable/c/68cbd70795dd8c06e7ccdc4eb0b74c5b180076c3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/08d931a0a850ad16a64f2cd23a19f40795cdbdf7","name":"https://git.kernel.org/stable/c/08d931a0a850ad16a64f2cd23a19f40795cdbdf7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b28fe65a36b8209b6adcf2722c7ce974cf9ac8d1","name":"https://git.kernel.org/stable/c/b28fe65a36b8209b6adcf2722c7ce974cf9ac8d1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a77644d009dece1104b6fcc6e322b0e4503db0d6","name":"https://git.kernel.org/stable/c/a77644d009dece1104b6fcc6e322b0e4503db0d6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0f05d95b99164a9ccc4cf4a4920e0ff0228138ad","name":"https://git.kernel.org/stable/c/0f05d95b99164a9ccc4cf4a4920e0ff0228138ad","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-93239","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93239","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1d18c47c735e8adfe531fc41fae31e98f86b68fe 08d931a0a850ad16a64f2cd23a19f40795cdbdf7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1d18c47c735e8adfe531fc41fae31e98f86b68fe b28fe65a36b8209b6adcf2722c7ce974cf9ac8d1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1d18c47c735e8adfe531fc41fae31e98f86b68fe 68cbd70795dd8c06e7ccdc4eb0b74c5b180076c3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1d18c47c735e8adfe531fc41fae31e98f86b68fe 0f05d95b99164a9ccc4cf4a4920e0ff0228138ad git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1d18c47c735e8adfe531fc41fae31e98f86b68fe a77644d009dece1104b6fcc6e322b0e4503db0d6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.7","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 3.7 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.157 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.110 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.51 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.5 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc2 * 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/arm64/mm/fault.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"08d931a0a850ad16a64f2cd23a19f40795cdbdf7","status":"affected","version":"1d18c47c735e8adfe531fc41fae31e98f86b68fe","versionType":"git"},{"lessThan":"b28fe65a36b8209b6adcf2722c7ce974cf9ac8d1","status":"affected","version":"1d18c47c735e8adfe531fc41fae31e98f86b68fe","versionType":"git"},{"lessThan":"68cbd70795dd8c06e7ccdc4eb0b74c5b180076c3","status":"affected","version":"1d18c47c735e8adfe531fc41fae31e98f86b68fe","versionType":"git"},{"lessThan":"0f05d95b99164a9ccc4cf4a4920e0ff0228138ad","status":"affected","version":"1d18c47c735e8adfe531fc41fae31e98f86b68fe","versionType":"git"},{"lessThan":"a77644d009dece1104b6fcc6e322b0e4503db0d6","status":"affected","version":"1d18c47c735e8adfe531fc41fae31e98f86b68fe","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["arch/arm64/mm/fault.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.7"},{"lessThan":"3.7","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.157","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.110","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.51","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.5","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.157","versionStartIncluding":"3.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.110","versionStartIncluding":"3.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.51","versionStartIncluding":"3.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.5","versionStartIncluding":"3.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc2","versionStartIncluding":"3.7","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\narm64: mm: Fix the lockless page-table walk in show_pte()\n\nshow_pte() walks page tables locklessly and can run with interrupts\nenabled. A concurrent teardown can free a table page while it is being\nwalked. It can also clear a parent entry after show_pte() checked it; the\nregular pXd_offset() helpers then reread the cleared entry and can derive a\nbogus lower-level pointer and fault again.\n\nUse the lockless offset helpers with the saved parent entries, as\ngup_fast() does, and pass the saved PMD to pte_offset_map().\n\nFor task page tables, arm64 selects MMU_GATHER_RCU_TABLE_FREE. Disable\nlocal interrupts around the walk to hold off RCU-deferred table frees and\nblock the tlb_remove_table_sync_one() IPI until the walk is finished.\n\nPlace the IRQ guard after the header print. This does not make the output a\nconsistent snapshot, but prevents the task page-table walk from\ndereferencing a released table page or deriving a pointer from a different\nparent value."}],"providerMetadata":{"dateUpdated":"2026-09-24T15:34:27.219Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/08d931a0a850ad16a64f2cd23a19f40795cdbdf7"},{"url":"https://git.kernel.org/stable/c/b28fe65a36b8209b6adcf2722c7ce974cf9ac8d1"},{"url":"https://git.kernel.org/stable/c/68cbd70795dd8c06e7ccdc4eb0b74c5b180076c3"},{"url":"https://git.kernel.org/stable/c/0f05d95b99164a9ccc4cf4a4920e0ff0228138ad"},{"url":"https://git.kernel.org/stable/c/a77644d009dece1104b6fcc6e322b0e4503db0d6"}],"title":"arm64: mm: Fix the lockless page-table walk in show_pte()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-93239","datePublished":"2026-09-24T15:34:27.219Z","dateReserved":"2026-09-17T16:02:15.095Z","dateUpdated":"2026-09-24T15:34:27.219Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-24 16:17:19","lastModifiedDate":"2026-09-24 16:17:19","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"93239","Ordinal":"1","Title":"arm64: mm: Fix the lockless page-table walk in show_pte()","CVE":"CVE-2026-93239","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"93239","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\narm64: mm: Fix the lockless page-table walk in show_pte()\n\nshow_pte() walks page tables locklessly and can run with interrupts\nenabled. A concurrent teardown can free a table page while it is being\nwalked. It can also clear a parent entry after show_pte() checked it; the\nregular pXd_offset() helpers then reread the cleared entry and can derive a\nbogus lower-level pointer and fault again.\n\nUse the lockless offset helpers with the saved parent entries, as\ngup_fast() does, and pass the saved PMD to pte_offset_map().\n\nFor task page tables, arm64 selects MMU_GATHER_RCU_TABLE_FREE. Disable\nlocal interrupts around the walk to hold off RCU-deferred table frees and\nblock the tlb_remove_table_sync_one() IPI until the walk is finished.\n\nPlace the IRQ guard after the header print. This does not make the output a\nconsistent snapshot, but prevents the task page-table walk from\ndereferencing a released table page or deriving a pointer from a different\nparent value.","Type":"Description","Title":"arm64: mm: Fix the lockless page-table walk in show_pte()"}]}}}