CVE-2021-46927

{"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": [{"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", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-46927", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-02-27T15:46:16.994467Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-07-05T17:22:00.781Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:17:42.860Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/90d2beed5e753805c5eab656b8d48257638fe543", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/3a0152b219523227c2a62a0a122cf99608287176", "tags": ["x_transferred"]}]}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/90d2beed5e753805c5eab656b8d48257638fe543", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/3a0152b219523227c2a62a0a122cf99608287176", "tags": ["x_transferred"]}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:17:42.860Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-46927", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-02-27T15:46:16.994467Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-07-05T15:20:40.900Z"}}], "cna": {"title": "nitro_enclaves: Use get_user_pages_unlocked() call to handle mmap assert", "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5b78ed24e8ec48602c1d6f5a188e58d000c81e2b", "lessThan": "90d2beed5e753805c5eab656b8d48257638fe543", "versionType": "git"}, {"status": "affected", "version": "5b78ed24e8ec48602c1d6f5a188e58d000c81e2b", "lessThan": "3a0152b219523227c2a62a0a122cf99608287176", "versionType": "git"}], "programFiles": ["drivers/virt/nitro_enclaves/ne_misc_dev.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.15"}, {"status": "unaffected", "version": "0", "lessThan": "5.15", "versionType": "semver"}, {"status": "unaffected", "version": "5.15.13", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "5.16", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/virt/nitro_enclaves/ne_misc_dev.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/90d2beed5e753805c5eab656b8d48257638fe543"}, {"url": "https://git.kernel.org/stable/c/3a0152b219523227c2a62a0a122cf99608287176"}], "x_generator": {"engine": "bippy-1.2.0"}, "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()."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.13", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.16", "versionStartIncluding": "5.15"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T13:44:35.485Z"}}}, "cveMetadata": {"cveId": "CVE-2021-46927", "state": "PUBLISHED", "dateUpdated": "2026-05-11T13:44:35.485Z", "dateReserved": "2024-02-25T13:45:52.720Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-02-27T09:43:56.743Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/virt/nitro_enclaves/ne_misc_dev.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "90d2beed5e753805c5eab656b8d48257638fe543", "status": "affected", "version": "5b78ed24e8ec48602c1d6f5a188e58d000c81e2b", "versionType": "git"}, {"lessThan": "3a0152b219523227c2a62a0a122cf99608287176", "status": "affected", "version": "5b78ed24e8ec48602c1d6f5a188e58d000c81e2b", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/virt/nitro_enclaves/ne_misc_dev.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.15"}, {"lessThan": "5.15", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.13", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "5.16", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "8CC64BCA-D219-487C-A123-4C470FE30AB2", "versionEndExcluding": "5.15.13", "versionStartIncluding": "5.15.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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()."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nitro_enclaves: use la llamada get_user_pages_unlocked() para manejar mmap afirmar. Despu\u00e9s del commit 5b78ed24e8ec (\"mm/pagemap: agregue anotaciones mmap_assert_locked() a find_vma*()\"), la llamada a get_user_pages( ) activar\u00e1 la afirmaci\u00f3n mmap. est\u00e1tico en l\u00ednea void mmap_assert_locked(struct mm_struct *mm) { lockdep_assert_held(&amp;mm-&gt;mmap_lock); VM_BUG_ON_MM(!rwsem_is_locked(&amp;mm-&gt;mmap_lock), mm); } [62.521410] \u00a1ERROR del kernel en include/linux/mmap_lock.h:156! ................................................. ......... [ 62.538938] RIP: 0010:find_vma+0x32/0x80 ................................. ................................. [ 62.605889] Seguimiento de llamadas: [ 62.608502] [ 62.610956] ? LOCK_TIMER_BASE+0x61/0x80 [62.614106] find_extend_vma+0x19/0x80 [62.617195] __get_user_pages+0x9b/0x6a0 [62.6203356] __guup_longter_locked+0x42d/0x450 [62.620356] terminar_esperar+0x41/0x80 [62.626748]? __kmalloc+0x178/0x2f0 [ 62.629768] ne_set_user_memory_region_ioctl.isra.0+0x225/0x6a0 [nitro_enclaves] [ 62.635776] ne_enclave_ioctl+0x1cf/0x6d7 [nitro_enclaves] [ 62.639541] __x64 _sys_ioctl+0x82/0xb0 [ 62.642620] do_syscall_64+0x3b/0x90 [ 62.645642] Entry_SYSCALL_64_after_hwframe+0x44/0xae Utilice get_user_pages_unlocked() al configurar las regiones de memoria del enclave. Es un patr\u00f3n similar al mmap_read_lock() usado junto con get_user_pages()."}], "id": "CVE-2021-46927", "lastModified": "2026-06-17T04:15:52.670", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-46927", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-02-27T15:46:16.994467Z", "version": "2.0.3"}}]}, "published": "2024-02-27T10:15:07.410", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3a0152b219523227c2a62a0a122cf99608287176"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/90d2beed5e753805c5eab656b8d48257638fe543"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3a0152b219523227c2a62a0a122cf99608287176"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/90d2beed5e753805c5eab656b8d48257638fe543"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-667"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: nitro_enclaves: Use get_user_pages_unlocked() call to handle mmap assert", "id": "2266365", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2266365"}, "csaw": false, "cvss3": {"cvss3_base_score": "2.3", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L", "status": "draft"}, "cwe": "CWE-413", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnitro_enclaves: Use get_user_pages_unlocked() call to handle mmap assert\nAfter commit 5b78ed24e8ec (\"mm/pagemap: add mmap_assert_locked()\nannotations to find_vma*()\"), the call to get_user_pages() will trigger\nthe mmap assert.\nstatic inline void mmap_assert_locked(struct mm_struct *mm)\n{\nlockdep_assert_held(&mm->mmap_lock);\nVM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_lock), mm);\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\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()."], "name": "CVE-2021-46927", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "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"}], "public_date": "2024-02-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-46927\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-46927\nhttps://lore.kernel.org/linux-cve-announce/2024022749-CVE-2021-46927-ae70@gregkh/T"], "statement": "Red Hat Enterprise Linux 8 and 9 are not affected by this vulnerability.", "threat_severity": "Moderate"}

{}