{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2021-46927",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2024-02-25T13:45:52.720Z",
        "datePublished": "2024-02-27T09:43:56.743Z",
        "dateUpdated": "2026-05-11T13:44:35.485Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-05-11T13:44:35.485Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnitro_enclaves: Use get_user_pages_unlocked() call to handle mmap assert\n\nAfter commit 5b78ed24e8ec (\"mm/pagemap: add mmap_assert_locked()\nannotations to find_vma*()\"), the call to get_user_pages() will trigger\nthe mmap assert.\n\nstatic inline void mmap_assert_locked(struct mm_struct *mm)\n{\n\tlockdep_assert_held(&mm->mmap_lock);\n\tVM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_lock), mm);\n}\n\n[   62.521410] kernel BUG at include/linux/mmap_lock.h:156!\n...........................................................\n[   62.538938] RIP: 0010:find_vma+0x32/0x80\n...........................................................\n[   62.605889] Call Trace:\n[   62.608502]  <TASK>\n[   62.610956]  ? lock_timer_base+0x61/0x80\n[   62.614106]  find_extend_vma+0x19/0x80\n[   62.617195]  __get_user_pages+0x9b/0x6a0\n[   62.620356]  __gup_longterm_locked+0x42d/0x450\n[   62.623721]  ? finish_wait+0x41/0x80\n[   62.626748]  ? __kmalloc+0x178/0x2f0\n[   62.629768]  ne_set_user_memory_region_ioctl.isra.0+0x225/0x6a0 [nitro_enclaves]\n[   62.635776]  ne_enclave_ioctl+0x1cf/0x6d7 [nitro_enclaves]\n[   62.639541]  __x64_sys_ioctl+0x82/0xb0\n[   62.642620]  do_syscall_64+0x3b/0x90\n[   62.645642]  entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nUse get_user_pages_unlocked() when setting the enclave memory regions.\nThat's a similar pattern as mmap_read_lock() used together with\nget_user_pages()."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/virt/nitro_enclaves/ne_misc_dev.c"
                    ],
                    "versions": [
                        {
                            "version": "5b78ed24e8ec48602c1d6f5a188e58d000c81e2b",
                            "lessThan": "90d2beed5e753805c5eab656b8d48257638fe543",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5b78ed24e8ec48602c1d6f5a188e58d000c81e2b",
                            "lessThan": "3a0152b219523227c2a62a0a122cf99608287176",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/virt/nitro_enclaves/ne_misc_dev.c"
                    ],
                    "versions": [
                        {
                            "version": "5.15",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.15",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.13",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.16",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
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                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.15",
                                    "versionEndExcluding": "5.15.13"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.15",
                                    "versionEndExcluding": "5.16"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/90d2beed5e753805c5eab656b8d48257638fe543"
                },
                {
                    "url": "https://git.kernel.org/stable/c/3a0152b219523227c2a62a0a122cf99608287176"
                }
            ],
            "title": "nitro_enclaves: Use get_user_pages_unlocked() call to handle mmap assert",
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        "adp": [
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                            "content": {
                                "id": "CVE-2021-46927",
                                "role": "CISA Coordinator",
                                "options": [
                                    {
                                        "Exploitation": "none"
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                                "version": "2.0.3",
                                "timestamp": "2024-02-27T15:46:16.994467Z"
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                    "shortName": "CVE",
                    "dateUpdated": "2024-08-04T05:17:42.860Z"
                },
                "title": "CVE Program Container",
                "references": [
                    {
                        "url": "https://git.kernel.org/stable/c/90d2beed5e753805c5eab656b8d48257638fe543",
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