CVE-2021-46927

{"id": "CVE-2021-46927", "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "published": "2024-02-27T10:15:07.410", "references": [{"url": "https://git.kernel.org/stable/c/3a0152b219523227c2a62a0a122cf99608287176", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/90d2beed5e753805c5eab656b8d48257638fe543", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-667"}]}], "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()."}], "lastModified": "2024-04-10T16:25:32.067", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8CC64BCA-D219-487C-A123-4C470FE30AB2", "versionEndExcluding": "5.15.13", "versionStartIncluding": "5.15.0"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}