{"schema":"threatline.record/2","record":{"id":"CVE-2026-93239","aliases":[],"summary":"arm64: mm: Fix the lockless page-table walk in show_pte()","details":"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.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93239","source_modified_at":"2026-10-19T09:07:50.737Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"1d18c47c735e8adfe531fc41fae31e98f86b68fe","lessThan":"08d931a0a850ad16a64f2cd23a19f40795cdbdf7","status":"affected","versionType":"git"},{"version":"1d18c47c735e8adfe531fc41fae31e98f86b68fe","lessThan":"b28fe65a36b8209b6adcf2722c7ce974cf9ac8d1","status":"affected","versionType":"git"},{"version":"1d18c47c735e8adfe531fc41fae31e98f86b68fe","lessThan":"68cbd70795dd8c06e7ccdc4eb0b74c5b180076c3","status":"affected","versionType":"git"},{"version":"1d18c47c735e8adfe531fc41fae31e98f86b68fe","lessThan":"0f05d95b99164a9ccc4cf4a4920e0ff0228138ad","status":"affected","versionType":"git"},{"version":"1d18c47c735e8adfe531fc41fae31e98f86b68fe","lessThan":"a77644d009dece1104b6fcc6e322b0e4503db0d6","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93239","source_modified_at":"2026-10-19T09:07:50.737Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"3.7","status":"affected"},{"version":"0","lessThan":"3.7","status":"unaffected","versionType":"semver"},{"version":"6.6.157","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.110","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.51","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.5","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93239","source_modified_at":"2026-10-19T09:07:50.737Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"08d931a0a850ad16a64f2cd23a19f40795cdbdf7","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93239","source_modified_at":"2026-10-19T09:07:50.737Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"68cbd70795dd8c06e7ccdc4eb0b74c5b180076c3","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93239","source_modified_at":"2026-10-19T09:07:50.737Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"0f05d95b99164a9ccc4cf4a4920e0ff0228138ad","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.002,"percentile":0.09341,"score_date":"2026-10-23"},"published_at":"2026-09-24T15:34:27.219Z","modified_at":"2026-10-19T09:07:50.737Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-93239","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:07:50.737Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-93239","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/08d931a0a850ad16a64f2cd23a19f40795cdbdf7"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/b28fe65a36b8209b6adcf2722c7ce974cf9ac8d1"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/68cbd70795dd8c06e7ccdc4eb0b74c5b180076c3"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/0f05d95b99164a9ccc4cf4a4920e0ff0228138ad"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/a77644d009dece1104b6fcc6e322b0e4503db0d6"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:07:50.737Z","content_hash":"bd48428860db03c590417f334abdaa6a87511813c78bdaa46b0ab8102784dc5e"}}