{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-90303",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-09-11T19:38:34.799Z",
        "datePublished": "2026-09-17T16:08:26.455Z",
        "dateUpdated": "2026-10-19T09:01:21.209Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-19T09:01:21.209Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nARM: 9485/1: mm: acquire mmap write lock around show_pte() for user faults\n\nWhen CONFIG_DEBUG_USER=y, and cmdline \"user_debug=31\" is set,\na user fault may trigger show_pte() without any lock.\nIf another thread in the same process concurrently calls munmap(),\nthe page table pages may be freed while show_pte() is still traversing\nthem, causing a use-after-free in show_pte().\n\nIf CONFIG_ARM_LPAE=y, this may cause a kernel panic if the pages table\nof PMD are freed when show_pte() is running.\n\nAcquire mmap_write_lock() around show_pte() for user faults to fix the\ncontention.\n\nFor user faults, additionally restrict that show_pte() is called only\nwhen the addr is a user-space address (addr < TASK_SIZE). This is because\nthe lock of tsk->mm only protects the virtual memory of user address space,\nfurthermore, dumping the page tables of a kernel-space address for user\nfaults is unnecessary and may have security implications.\n\nKeep everything unchanged for kernel faults, because the kernel is\nalready in the \"oops\" state, acquiring a lock may risk a deadlock."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "arch/arm/mm/fault.c"
                    ],
                    "versions": [
                        {
                            "version": "6d021b724481fbb908eb29384898deb9f00dfe70",
                            "lessThan": "ab14f07952adfe735d86a53518f8cd576dfd5892",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "6d021b724481fbb908eb29384898deb9f00dfe70",
                            "lessThan": "07e4d5380f2a844ab7a1b440dde350caf561cbb0",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "6d021b724481fbb908eb29384898deb9f00dfe70",
                            "lessThan": "2a14d7797a49a47bccd1a9327fd69da838dcb0dd",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "6d021b724481fbb908eb29384898deb9f00dfe70",
                            "lessThan": "63e3c958a602d0896a101a897c2361878c266ca7",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "6d021b724481fbb908eb29384898deb9f00dfe70",
                            "lessThan": "59bbf86d0ff9373bfa033ca123c1e924f09f1eba",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "6d021b724481fbb908eb29384898deb9f00dfe70",
                            "lessThan": "c71f9a56520b419e55d173052629f2324deb5549",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "6d021b724481fbb908eb29384898deb9f00dfe70",
                            "lessThan": "720408d98d9fb3c91a12090436734c8c61f04545",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "6d021b724481fbb908eb29384898deb9f00dfe70",
                            "lessThan": "1039bffd6ae9c75b42b7d148d6c1106134107b66",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "arch/arm/mm/fault.c"
                    ],
                    "versions": [
                        {
                            "version": "4.0",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "4.0",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.270",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.221",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.188",
                            "lessThanOrEqual": "6.1.*",
                            "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": "6.18.52",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.6",
                            "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": "4.0",
                                    "versionEndExcluding": "5.10.270"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.0",
                                    "versionEndExcluding": "5.15.221"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.0",
                                    "versionEndExcluding": "6.1.188"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.0",
                                    "versionEndExcluding": "6.6.157"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.0",
                                    "versionEndExcluding": "6.12.110"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.0",
                                    "versionEndExcluding": "6.18.52"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.0",
                                    "versionEndExcluding": "7.2.6"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.0",
                                    "versionEndExcluding": "7.3"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/ab14f07952adfe735d86a53518f8cd576dfd5892"
                },
                {
                    "url": "https://git.kernel.org/stable/c/07e4d5380f2a844ab7a1b440dde350caf561cbb0"
                },
                {
                    "url": "https://git.kernel.org/stable/c/2a14d7797a49a47bccd1a9327fd69da838dcb0dd"
                },
                {
                    "url": "https://git.kernel.org/stable/c/63e3c958a602d0896a101a897c2361878c266ca7"
                },
                {
                    "url": "https://git.kernel.org/stable/c/59bbf86d0ff9373bfa033ca123c1e924f09f1eba"
                },
                {
                    "url": "https://git.kernel.org/stable/c/c71f9a56520b419e55d173052629f2324deb5549"
                },
                {
                    "url": "https://git.kernel.org/stable/c/720408d98d9fb3c91a12090436734c8c61f04545"
                },
                {
                    "url": "https://git.kernel.org/stable/c/1039bffd6ae9c75b42b7d148d6c1106134107b66"
                }
            ],
            "title": "ARM: 9485/1: mm: acquire mmap write lock around show_pte() for user faults",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}