{"api_version":"1","generated_at":"2026-10-28T16:52:40+00:00","cve":"CVE-2026-98923","urls":{"html":"https://cve.report/CVE-2026-98923","api":"https://cve.report/api/cve/CVE-2026-98923.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98923","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98923"},"summary":{"title":"arm64: io: Reject non-user protection in ioremap_prot()","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-10-23 13:17:12","updated_at":"2026-10-23 13:17:12"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/b17aa4955e3a694c663ebe99626e4c76ca4f7cfb","name":"https://git.kernel.org/stable/c/b17aa4955e3a694c663ebe99626e4c76ca4f7cfb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0b04af3d88bb7fc69b2d92457890608860e42365","name":"https://git.kernel.org/stable/c/0b04af3d88bb7fc69b2d92457890608860e42365","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9b583795feb51f8d50203228d001760d1344ef01","name":"https://git.kernel.org/stable/c/9b583795feb51f8d50203228d001760d1344ef01","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fddc90d4af4550af410f52d11bbf6b5f36443838","name":"https://git.kernel.org/stable/c/fddc90d4af4550af410f52d11bbf6b5f36443838","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/bb756b11ad63832ebee58caf9e8f9381eaecff9f","name":"https://git.kernel.org/stable/c/bb756b11ad63832ebee58caf9e8f9381eaecff9f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98923","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98923","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 64858b76ec67c5fc40fef8ec1841fecb78c1ebde fddc90d4af4550af410f52d11bbf6b5f36443838 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected eeecafce5afffb4da703666ebefbd4d6e2a5abf6 0b04af3d88bb7fc69b2d92457890608860e42365 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3d64dcc0799c2d6921ba027716b7be721eb19fa8 b17aa4955e3a694c663ebe99626e4c76ca4f7cfb git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8f098037139b294050053123ab2bc0f819d08932 9b583795feb51f8d50203228d001760d1344ef01 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8f098037139b294050053123ab2bc0f819d08932 bb756b11ad63832ebee58caf9e8f9381eaecff9f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d1ad8fe7f72d73e1617bac79f2ec7a3bedf47e2a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.6.143 6.6.158 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.12.93 6.12.112 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.18.17 6.18.55 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.19.7 6.20 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7.0","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.158 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.112 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.55 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.9 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3 * 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/include/asm/io.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"fddc90d4af4550af410f52d11bbf6b5f36443838","status":"affected","version":"64858b76ec67c5fc40fef8ec1841fecb78c1ebde","versionType":"git"},{"lessThan":"0b04af3d88bb7fc69b2d92457890608860e42365","status":"affected","version":"eeecafce5afffb4da703666ebefbd4d6e2a5abf6","versionType":"git"},{"lessThan":"b17aa4955e3a694c663ebe99626e4c76ca4f7cfb","status":"affected","version":"3d64dcc0799c2d6921ba027716b7be721eb19fa8","versionType":"git"},{"lessThan":"9b583795feb51f8d50203228d001760d1344ef01","status":"affected","version":"8f098037139b294050053123ab2bc0f819d08932","versionType":"git"},{"lessThan":"bb756b11ad63832ebee58caf9e8f9381eaecff9f","status":"affected","version":"8f098037139b294050053123ab2bc0f819d08932","versionType":"git"},{"status":"affected","version":"d1ad8fe7f72d73e1617bac79f2ec7a3bedf47e2a","versionType":"git"},{"lessThan":"6.6.158","status":"affected","version":"6.6.143","versionType":"semver"},{"lessThan":"6.12.112","status":"affected","version":"6.12.93","versionType":"semver"},{"lessThan":"6.18.55","status":"affected","version":"6.18.17","versionType":"semver"},{"lessThan":"6.20","status":"affected","version":"6.19.7","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["arch/arm64/include/asm/io.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"7.0"},{"lessThan":"7.0","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.158","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.112","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.55","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.9","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.158","versionStartIncluding":"6.6.143","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.112","versionStartIncluding":"6.12.93","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.55","versionStartIncluding":"6.18.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.9","versionStartIncluding":"7.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3","versionStartIncluding":"7.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19.7","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"providerMetadata":{"dateUpdated":"2026-10-23T12:05:45.179Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/fddc90d4af4550af410f52d11bbf6b5f36443838"},{"url":"https://git.kernel.org/stable/c/0b04af3d88bb7fc69b2d92457890608860e42365"},{"url":"https://git.kernel.org/stable/c/b17aa4955e3a694c663ebe99626e4c76ca4f7cfb"},{"url":"https://git.kernel.org/stable/c/9b583795feb51f8d50203228d001760d1344ef01"},{"url":"https://git.kernel.org/stable/c/bb756b11ad63832ebee58caf9e8f9381eaecff9f"}],"title":"arm64: io: Reject non-user protection in ioremap_prot()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-98923","datePublished":"2026-10-23T12:03:28.027Z","dateReserved":"2026-09-25T10:25:14.380Z","dateUpdated":"2026-10-23T12:05:45.179Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-23 13:17:12","lastModifiedDate":"2026-10-23 13:17:12","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98923","Ordinal":"1","Title":"arm64: io: Reject non-user protection in ioremap_prot()","CVE":"CVE-2026-98923","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98923","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"arm64: io: Reject non-user protection in ioremap_prot()"}]}}}