CVE-2026-98923

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98923", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.380Z", "datePublished": "2026-10-23T12:03:28.027Z", "dateUpdated": "2026-10-23T12:05:45.179Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-23T12:05:45.179Z"}, "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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/arm64/include/asm/io.h"], "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"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/arm64/include/asm/io.h"], "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"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.143", "versionEndExcluding": "6.6.158"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.93", "versionEndExcluding": "6.12.112"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18.17", "versionEndExcluding": "6.18.55"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0", "versionEndExcluding": "7.2.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0", "versionEndExcluding": "7.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19.7"}]}]}], "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"}}}}

{}

{"affected": [{"affectedData": [{"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"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-98923", "lastModified": "2026-10-23T13:17:12.957", "metrics": {}, "published": "2026-10-23T13:17:12.957", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0b04af3d88bb7fc69b2d92457890608860e42365"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9b583795feb51f8d50203228d001760d1344ef01"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b17aa4955e3a694c663ebe99626e4c76ca4f7cfb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/bb756b11ad63832ebee58caf9e8f9381eaecff9f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fddc90d4af4550af410f52d11bbf6b5f36443838"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: arm64: io: Reject non-user protection in ioremap_prot()", "id": "2559635", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2559635"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-617", "details": ["In the Linux kernel, the following vulnerability has been resolved:\narm64: io: Reject non-user protection in ioremap_prot()\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():\nWARNING: ./arch/arm64/include/asm/io.h:275 at generic_access_phys\nCall trace:\ngeneric_access_phys+0x1c8/0x228 (P)\n__access_remote_vm+0x2b4/0x398\naccess_remote_vm+0x14/0x30\nget_mm_cmdline+0xf8/0x2a0\nproc_pid_cmdline_read+0x68/0x120\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().\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.\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.", "A flaw was found in the Linux kernel. A local user can cause a Denial of Service (DoS) by triggering an unexpected kernel warning on ARM64 systems. By establishing a restricted memory mapping and reading process details through the /proc interface, the kernel incorrectly flags valid user protection attributes as invalid. On systems configured to crash on kernel warnings, this issue results in a system panic."], "name": "CVE-2026-98923", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-23T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98923\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98923\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98923.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[64858b76ec67c5fc40fef8ec1841fecb78c1ebde,fddc90d4af4550af410f52d11bbf6b5f36443838)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[eeecafce5afffb4da703666ebefbd4d6e2a5abf6,0b04af3d88bb7fc69b2d92457890608860e42365)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3d64dcc0799c2d6921ba027716b7be721eb19fa8,b17aa4955e3a694c663ebe99626e4c76ca4f7cfb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8f098037139b294050053123ab2bc0f819d08932,9b583795feb51f8d50203228d001760d1344ef01)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8f098037139b294050053123ab2bc0f819d08932,bb756b11ad63832ebee58caf9e8f9381eaecff9f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "d1ad8fe7f72d73e1617bac79f2ec7a3bedf47e2a"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.6.143,6.6.158)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.12.93,6.12.112)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.18.17,6.18.55)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[6.19.7,6.20)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.6.158,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.112,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.55,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2.9,7.2.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3,*]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[64858b76ec67c5fc40fef8ec1841fecb78c1ebde,fddc90d4af4550af410f52d11bbf6b5f36443838)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[eeecafce5afffb4da703666ebefbd4d6e2a5abf6,0b04af3d88bb7fc69b2d92457890608860e42365)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3d64dcc0799c2d6921ba027716b7be721eb19fa8,b17aa4955e3a694c663ebe99626e4c76ca4f7cfb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8f098037139b294050053123ab2bc0f819d08932,9b583795feb51f8d50203228d001760d1344ef01)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8f098037139b294050053123ab2bc0f819d08932,bb756b11ad63832ebee58caf9e8f9381eaecff9f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "d1ad8fe7f72d73e1617bac79f2ec7a3bedf47e2a"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.6.143,6.6.158)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.12.93,6.12.112)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.18.17,6.18.55)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[6.19.7,6.20)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.6.158,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.112,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.55,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2.9,7.2.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3,*]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-10-23T16:00:15.829118+00:00", "updated": "2026-10-29T21:00:22.018572+00:00", "vendors": ["linux", "linux$PRODUCT$linux", "linux$PRODUCT$linux_kernel"]}