{
    "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",
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                                },
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                                    "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"
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                            ]
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            ],
            "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()",
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}