{"schema":"threatline.record/2","record":{"id":"CVE-2026-98923","aliases":[],"summary":"arm64: io: Reject non-user protection in ioremap_prot()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\narm64: io: Reject non-user protection in ioremap_prot()\n\nMapping a stack-top page via /dev/mem with PROT_NONE and then\nreading that process's /proc/<pid>/cmdline triggers a spurious WARN\nin ioremap_prot() through generic_access_phys():\n\n  WARNING: ./arch/arm64/include/asm/io.h:275 at generic_access_phys\n  Call trace:\n    generic_access_phys+0x1c8/0x228 (P)\n    __access_remote_vm+0x2b4/0x398\n    access_remote_vm+0x14/0x30\n    get_mm_cmdline+0xf8/0x2a0\n    proc_pid_cmdline_read+0x68/0x120\n\ngeneric_access_phys() passes the protection derived from the user PTE\nto ioremap_prot(). On arm64, a PROT_NONE mapping is represented by a\npresent-invalid PTE, so pte_present() still returns true and the\nprotection reaches ioremap_prot().\n\nA PROT_NONE mapping does not have PTE_USER, causing the existing\nWARN_ON_ONCE() in ioremap_prot() to fire even though this is a valid\nuser mapping. Execute-only mappings have the same issue and must not\nbe readable through this path either.\n\nioremap_prot() should therefore reject protection values without\nPTE_USER without warning. This makes the access fail cleanly for\nPROT_NONE and execute-only mappings while retaining the existing\nuser-protection contract.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98923","source_modified_at":"2026-10-23T12:05:45.179Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Linux","vendor":"Linux","versions":[{"version":"64858b76ec67c5fc40fef8ec1841fecb78c1ebde","lessThan":"fddc90d4af4550af410f52d11bbf6b5f36443838","status":"affected","versionType":"git"},{"version":"eeecafce5afffb4da703666ebefbd4d6e2a5abf6","lessThan":"0b04af3d88bb7fc69b2d92457890608860e42365","status":"affected","versionType":"git"},{"version":"3d64dcc0799c2d6921ba027716b7be721eb19fa8","lessThan":"b17aa4955e3a694c663ebe99626e4c76ca4f7cfb","status":"affected","versionType":"git"},{"version":"8f098037139b294050053123ab2bc0f819d08932","lessThan":"9b583795feb51f8d50203228d001760d1344ef01","status":"affected","versionType":"git"},{"version":"8f098037139b294050053123ab2bc0f819d08932","lessThan":"bb756b11ad63832ebee58caf9e8f9381eaecff9f","status":"affected","versionType":"git"},{"version":"d1ad8fe7f72d73e1617bac79f2ec7a3bedf47e2a","status":"affected","versionType":"git"},{"version":"6.6.143","lessThan":"6.6.158","status":"affected","versionType":"semver"},{"version":"6.12.93","lessThan":"6.12.112","status":"affected","versionType":"semver"},{"version":"6.18.17","lessThan":"6.18.55","status":"affected","versionType":"semver"},{"version":"6.19.7","lessThan":"6.20","status":"affected","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98923","source_modified_at":"2026-10-23T12:05:45.179Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Linux","vendor":"Linux","versions":[{"version":"7.0","status":"affected"},{"version":"0","lessThan":"7.0","status":"unaffected","versionType":"semver"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.112","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.55","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.9","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-2026-98923","source_modified_at":"2026-10-23T12:05:45.179Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"0b04af3d88bb7fc69b2d92457890608860e42365","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98923","source_modified_at":"2026-10-23T12:05:45.179Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"9b583795feb51f8d50203228d001760d1344ef01","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98923","source_modified_at":"2026-10-23T12:05:45.179Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"6.6.158","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98923","source_modified_at":"2026-10-23T12:05:45.179Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"6.12.112","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98923","source_modified_at":"2026-10-23T12:05:45.179Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"6.18.55","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98923","source_modified_at":"2026-10-23T12:05:45.179Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"6.20","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":null,"percentile":null,"score_date":null},"published_at":"2026-10-23T12:03:28.027Z","modified_at":"2026-10-23T12:05:45.179Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98923","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T12:05:45.179Z"}],"sources":["CVE List"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/fddc90d4af4550af410f52d11bbf6b5f36443838"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/0b04af3d88bb7fc69b2d92457890608860e42365"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/b17aa4955e3a694c663ebe99626e4c76ca4f7cfb"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/9b583795feb51f8d50203228d001760d1344ef01"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/bb756b11ad63832ebee58caf9e8f9381eaecff9f"}],"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":"2026-10-23T12:05:45.179Z","content_hash":"f4590cc27778ef9dc412a4daebe69aa4b117faac326e94b9dedcfbf5094009bf"}}