CVE-2021-47462

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2021-47462", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-22T06:20:56.198Z", "datePublished": "2024-05-22T06:23:23.034Z", "dateUpdated": "2026-05-11T13:55:11.463Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T13:55:11.463Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/mempolicy: do not allow illegal MPOL_F_NUMA_BALANCING | MPOL_LOCAL in mbind()\n\nsyzbot reported access to unitialized memory in mbind() [1]\n\nIssue came with commit bda420b98505 (\"numa balancing: migrate on fault\namong multiple bound nodes\")\n\nThis commit added a new bit in MPOL_MODE_FLAGS, but only checked valid\ncombination (MPOL_F_NUMA_BALANCING can only be used with MPOL_BIND) in\ndo_set_mempolicy()\n\nThis patch moves the check in sanitize_mpol_flags() so that it is also\nused by mbind()\n\n [1]\n BUG: KMSAN: uninit-value in __mpol_equal+0x567/0x590 mm/mempolicy.c:2260\n __mpol_equal+0x567/0x590 mm/mempolicy.c:2260\n mpol_equal include/linux/mempolicy.h:105 [inline]\n vma_merge+0x4a1/0x1e60 mm/mmap.c:1190\n mbind_range+0xcc8/0x1e80 mm/mempolicy.c:811\n do_mbind+0xf42/0x15f0 mm/mempolicy.c:1333\n kernel_mbind mm/mempolicy.c:1483 [inline]\n __do_sys_mbind mm/mempolicy.c:1490 [inline]\n __se_sys_mbind+0x437/0xb80 mm/mempolicy.c:1486\n __x64_sys_mbind+0x19d/0x200 mm/mempolicy.c:1486\n do_syscall_x64 arch/x86/entry/common.c:51 [inline]\n do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\n Uninit was created at:\n slab_alloc_node mm/slub.c:3221 [inline]\n slab_alloc mm/slub.c:3230 [inline]\n kmem_cache_alloc+0x751/0xff0 mm/slub.c:3235\n mpol_new mm/mempolicy.c:293 [inline]\n do_mbind+0x912/0x15f0 mm/mempolicy.c:1289\n kernel_mbind mm/mempolicy.c:1483 [inline]\n __do_sys_mbind mm/mempolicy.c:1490 [inline]\n __se_sys_mbind+0x437/0xb80 mm/mempolicy.c:1486\n __x64_sys_mbind+0x19d/0x200 mm/mempolicy.c:1486\n do_syscall_x64 arch/x86/entry/common.c:51 [inline]\n do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n =====================================================\n Kernel panic - not syncing: panic_on_kmsan set ...\n CPU: 0 PID: 15049 Comm: syz-executor.0 Tainted: G B 5.15.0-rc2-syzkaller #0\n Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\n Call Trace:\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x1ff/0x28e lib/dump_stack.c:106\n dump_stack+0x25/0x28 lib/dump_stack.c:113\n panic+0x44f/0xdeb kernel/panic.c:232\n kmsan_report+0x2ee/0x300 mm/kmsan/report.c:186\n __msan_warning+0xd7/0x150 mm/kmsan/instrumentation.c:208\n __mpol_equal+0x567/0x590 mm/mempolicy.c:2260\n mpol_equal include/linux/mempolicy.h:105 [inline]\n vma_merge+0x4a1/0x1e60 mm/mmap.c:1190\n mbind_range+0xcc8/0x1e80 mm/mempolicy.c:811\n do_mbind+0xf42/0x15f0 mm/mempolicy.c:1333\n kernel_mbind mm/mempolicy.c:1483 [inline]\n __do_sys_mbind mm/mempolicy.c:1490 [inline]\n __se_sys_mbind+0x437/0xb80 mm/mempolicy.c:1486\n __x64_sys_mbind+0x19d/0x200 mm/mempolicy.c:1486\n do_syscall_x64 arch/x86/entry/common.c:51 [inline]\n do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82\n entry_SYSCALL_64_after_hwframe+0x44/0xae"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/mempolicy.c"], "versions": [{"version": "bda420b985054a3badafef23807c4b4fa38a3dff", "lessThan": "9ee4e9ae98f1f262d6fae0d266cfdf3ba2c321d9", "status": "affected", "versionType": "git"}, {"version": "bda420b985054a3badafef23807c4b4fa38a3dff", "lessThan": "6d2aec9e123bb9c49cb5c7fc654f25f81e688e8c", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/mempolicy.c"], "versions": [{"version": "5.12", "status": "affected"}, {"version": "0", "lessThan": "5.12", "status": "unaffected", "versionType": "semver"}, {"version": "5.14.15", "lessThanOrEqual": "5.14.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15", "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": "5.12", "versionEndExcluding": "5.14.15"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "5.15"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/9ee4e9ae98f1f262d6fae0d266cfdf3ba2c321d9"}, {"url": "https://git.kernel.org/stable/c/6d2aec9e123bb9c49cb5c7fc654f25f81e688e8c"}], "title": "mm/mempolicy: do not allow illegal MPOL_F_NUMA_BALANCING | MPOL_LOCAL in mbind()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47462", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-05-22T19:48:07.390031Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:13:24.847Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:39:59.432Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/9ee4e9ae98f1f262d6fae0d266cfdf3ba2c321d9", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/6d2aec9e123bb9c49cb5c7fc654f25f81e688e8c", "tags": ["x_transferred"]}]}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/9ee4e9ae98f1f262d6fae0d266cfdf3ba2c321d9", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/6d2aec9e123bb9c49cb5c7fc654f25f81e688e8c", "tags": ["x_transferred"]}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:39:59.432Z"}}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47462", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-05-22T19:48:07.390031Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-05-22T19:48:15.511Z"}, "title": "CISA ADP Vulnrichment"}], "cna": {"title": "mm/mempolicy: do not allow illegal MPOL_F_NUMA_BALANCING | MPOL_LOCAL in mbind()", "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "bda420b985054a3badafef23807c4b4fa38a3dff", "lessThan": "9ee4e9ae98f1f262d6fae0d266cfdf3ba2c321d9", "versionType": "git"}, {"status": "affected", "version": "bda420b985054a3badafef23807c4b4fa38a3dff", "lessThan": "6d2aec9e123bb9c49cb5c7fc654f25f81e688e8c", "versionType": "git"}], "programFiles": ["mm/mempolicy.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.12"}, {"status": "unaffected", "version": "0", "lessThan": "5.12", "versionType": "semver"}, {"status": "unaffected", "version": "5.14.15", "versionType": "semver", "lessThanOrEqual": "5.14.*"}, {"status": "unaffected", "version": "5.15", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["mm/mempolicy.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/9ee4e9ae98f1f262d6fae0d266cfdf3ba2c321d9"}, {"url": "https://git.kernel.org/stable/c/6d2aec9e123bb9c49cb5c7fc654f25f81e688e8c"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/mempolicy: do not allow illegal MPOL_F_NUMA_BALANCING | MPOL_LOCAL in mbind()\n\nsyzbot reported access to unitialized memory in mbind() [1]\n\nIssue came with commit bda420b98505 (\"numa balancing: migrate on fault\namong multiple bound nodes\")\n\nThis commit added a new bit in MPOL_MODE_FLAGS, but only checked valid\ncombination (MPOL_F_NUMA_BALANCING can only be used with MPOL_BIND) in\ndo_set_mempolicy()\n\nThis patch moves the check in sanitize_mpol_flags() so that it is also\nused by mbind()\n\n [1]\n BUG: KMSAN: uninit-value in __mpol_equal+0x567/0x590 mm/mempolicy.c:2260\n __mpol_equal+0x567/0x590 mm/mempolicy.c:2260\n mpol_equal include/linux/mempolicy.h:105 [inline]\n vma_merge+0x4a1/0x1e60 mm/mmap.c:1190\n mbind_range+0xcc8/0x1e80 mm/mempolicy.c:811\n do_mbind+0xf42/0x15f0 mm/mempolicy.c:1333\n kernel_mbind mm/mempolicy.c:1483 [inline]\n __do_sys_mbind mm/mempolicy.c:1490 [inline]\n __se_sys_mbind+0x437/0xb80 mm/mempolicy.c:1486\n __x64_sys_mbind+0x19d/0x200 mm/mempolicy.c:1486\n do_syscall_x64 arch/x86/entry/common.c:51 [inline]\n do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\n Uninit was created at:\n slab_alloc_node mm/slub.c:3221 [inline]\n slab_alloc mm/slub.c:3230 [inline]\n kmem_cache_alloc+0x751/0xff0 mm/slub.c:3235\n mpol_new mm/mempolicy.c:293 [inline]\n do_mbind+0x912/0x15f0 mm/mempolicy.c:1289\n kernel_mbind mm/mempolicy.c:1483 [inline]\n __do_sys_mbind mm/mempolicy.c:1490 [inline]\n __se_sys_mbind+0x437/0xb80 mm/mempolicy.c:1486\n __x64_sys_mbind+0x19d/0x200 mm/mempolicy.c:1486\n do_syscall_x64 arch/x86/entry/common.c:51 [inline]\n do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n =====================================================\n Kernel panic - not syncing: panic_on_kmsan set ...\n CPU: 0 PID: 15049 Comm: syz-executor.0 Tainted: G B 5.15.0-rc2-syzkaller #0\n Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\n Call Trace:\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x1ff/0x28e lib/dump_stack.c:106\n dump_stack+0x25/0x28 lib/dump_stack.c:113\n panic+0x44f/0xdeb kernel/panic.c:232\n kmsan_report+0x2ee/0x300 mm/kmsan/report.c:186\n __msan_warning+0xd7/0x150 mm/kmsan/instrumentation.c:208\n __mpol_equal+0x567/0x590 mm/mempolicy.c:2260\n mpol_equal include/linux/mempolicy.h:105 [inline]\n vma_merge+0x4a1/0x1e60 mm/mmap.c:1190\n mbind_range+0xcc8/0x1e80 mm/mempolicy.c:811\n do_mbind+0xf42/0x15f0 mm/mempolicy.c:1333\n kernel_mbind mm/mempolicy.c:1483 [inline]\n __do_sys_mbind mm/mempolicy.c:1490 [inline]\n __se_sys_mbind+0x437/0xb80 mm/mempolicy.c:1486\n __x64_sys_mbind+0x19d/0x200 mm/mempolicy.c:1486\n do_syscall_x64 arch/x86/entry/common.c:51 [inline]\n do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82\n entry_SYSCALL_64_after_hwframe+0x44/0xae"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.14.15", "versionStartIncluding": "5.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15", "versionStartIncluding": "5.12"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-05-04T07:11:26.025Z"}}}, "cveMetadata": {"cveId": "CVE-2021-47462", "state": "PUBLISHED", "dateUpdated": "2025-05-04T07:11:26.025Z", "dateReserved": "2024-05-22T06:20:56.198Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-05-22T06:23:23.034Z", "assignerShortName": "Linux"}, "dataVersion": "5.1"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["mm/mempolicy.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "9ee4e9ae98f1f262d6fae0d266cfdf3ba2c321d9", "status": "affected", "version": "bda420b985054a3badafef23807c4b4fa38a3dff", "versionType": "git"}, {"lessThan": "6d2aec9e123bb9c49cb5c7fc654f25f81e688e8c", "status": "affected", "version": "bda420b985054a3badafef23807c4b4fa38a3dff", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["mm/mempolicy.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.12"}, {"lessThan": "5.12", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.14.*", "status": "unaffected", "version": "5.14.15", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "5.15", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "CFEAA14C-4860-49B1-9532-8AFC5E1BDEF5", "versionEndExcluding": "5.14.15", "versionStartIncluding": "5.12", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*", "matchCriteriaId": "E46C74C6-B76B-4C94-A6A4-FD2FFF62D644", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*", "matchCriteriaId": "60134C3A-06E4-48C1-B04F-2903732A4E56", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*", "matchCriteriaId": "0460DA88-8FE1-46A2-9DDA-1F1ABA552E71", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:*", "matchCriteriaId": "AF55383D-4DF2-45DC-93F7-571F4F978EAB", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc5:*:*:*:*:*:*", "matchCriteriaId": "9E9481B2-8AA6-4CBD-B5D3-C10F51FF6D01", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc6:*:*:*:*:*:*", "matchCriteriaId": "EBD45831-4B79-42BC-ABC0-86870F0DEA89", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/mempolicy: do not allow illegal MPOL_F_NUMA_BALANCING | MPOL_LOCAL in mbind()\n\nsyzbot reported access to unitialized memory in mbind() [1]\n\nIssue came with commit bda420b98505 (\"numa balancing: migrate on fault\namong multiple bound nodes\")\n\nThis commit added a new bit in MPOL_MODE_FLAGS, but only checked valid\ncombination (MPOL_F_NUMA_BALANCING can only be used with MPOL_BIND) in\ndo_set_mempolicy()\n\nThis patch moves the check in sanitize_mpol_flags() so that it is also\nused by mbind()\n\n [1]\n BUG: KMSAN: uninit-value in __mpol_equal+0x567/0x590 mm/mempolicy.c:2260\n __mpol_equal+0x567/0x590 mm/mempolicy.c:2260\n mpol_equal include/linux/mempolicy.h:105 [inline]\n vma_merge+0x4a1/0x1e60 mm/mmap.c:1190\n mbind_range+0xcc8/0x1e80 mm/mempolicy.c:811\n do_mbind+0xf42/0x15f0 mm/mempolicy.c:1333\n kernel_mbind mm/mempolicy.c:1483 [inline]\n __do_sys_mbind mm/mempolicy.c:1490 [inline]\n __se_sys_mbind+0x437/0xb80 mm/mempolicy.c:1486\n __x64_sys_mbind+0x19d/0x200 mm/mempolicy.c:1486\n do_syscall_x64 arch/x86/entry/common.c:51 [inline]\n do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\n Uninit was created at:\n slab_alloc_node mm/slub.c:3221 [inline]\n slab_alloc mm/slub.c:3230 [inline]\n kmem_cache_alloc+0x751/0xff0 mm/slub.c:3235\n mpol_new mm/mempolicy.c:293 [inline]\n do_mbind+0x912/0x15f0 mm/mempolicy.c:1289\n kernel_mbind mm/mempolicy.c:1483 [inline]\n __do_sys_mbind mm/mempolicy.c:1490 [inline]\n __se_sys_mbind+0x437/0xb80 mm/mempolicy.c:1486\n __x64_sys_mbind+0x19d/0x200 mm/mempolicy.c:1486\n do_syscall_x64 arch/x86/entry/common.c:51 [inline]\n do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n =====================================================\n Kernel panic - not syncing: panic_on_kmsan set ...\n CPU: 0 PID: 15049 Comm: syz-executor.0 Tainted: G B 5.15.0-rc2-syzkaller #0\n Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\n Call Trace:\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x1ff/0x28e lib/dump_stack.c:106\n dump_stack+0x25/0x28 lib/dump_stack.c:113\n panic+0x44f/0xdeb kernel/panic.c:232\n kmsan_report+0x2ee/0x300 mm/kmsan/report.c:186\n __msan_warning+0xd7/0x150 mm/kmsan/instrumentation.c:208\n __mpol_equal+0x567/0x590 mm/mempolicy.c:2260\n mpol_equal include/linux/mempolicy.h:105 [inline]\n vma_merge+0x4a1/0x1e60 mm/mmap.c:1190\n mbind_range+0xcc8/0x1e80 mm/mempolicy.c:811\n do_mbind+0xf42/0x15f0 mm/mempolicy.c:1333\n kernel_mbind mm/mempolicy.c:1483 [inline]\n __do_sys_mbind mm/mempolicy.c:1490 [inline]\n __se_sys_mbind+0x437/0xb80 mm/mempolicy.c:1486\n __x64_sys_mbind+0x19d/0x200 mm/mempolicy.c:1486\n do_syscall_x64 arch/x86/entry/common.c:51 [inline]\n do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82\n entry_SYSCALL_64_after_hwframe+0x44/0xae"}, {"lang": "es", "value": "En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: mm/mempolicy: no permitir MPOL_F_NUMA_BALANCING ilegal | MPOL_LOCAL en mbind() syzbot inform\u00f3 acceso a la memoria unificada en mbind() [1] El problema surgi\u00f3 con el commit bda420b98505 (\"equilibrio numa: migrar en caso de falla entre m\u00faltiples nodos vinculados\") Esta confirmaci\u00f3n agreg\u00f3 un nuevo bit en MPOL_MODE_FLAGS, pero solo marc\u00f3 que era v\u00e1lido combinaci\u00f3n (MPOL_F_NUMA_BALANCING solo se puede usar con MPOL_BIND) en do_set_mempolicy() Este parche mueve la verificaci\u00f3n en sanitize_mpol_flags() para que tambi\u00e9n sea usado por mbind() [1] ERROR: KMSAN: valor uninit en __mpol_equal+0x567/0x590 mm /mempolicy.c:2260 __mpol_equal+0x567/0x590 mm/mempolicy.c:2260 mpol_equal include/linux/mempolicy.h:105 [en l\u00ednea] vma_merge+0x4a1/0x1e60 mm/mmap.c:1190 mbind_range+0xcc8/0x1e80 mm/ mempolicy.c:811 do_mbind+0xf42/0x15f0 mm/mempolicy.c:1333 kernel_mbind mm/mempolicy.c:1483 [en l\u00ednea] __do_sys_mbind mm/mempolicy.c:1490 [en l\u00ednea] __se_sys_mbind+0x437/0xb80 mm/mempolicy.c: 1486 __x64_sys_mbind+0x19d/0x200 mm/mempolicy.c:1486 do_syscall_x64 arch/x86/entry/common.c:51 [en l\u00ednea] do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82 Entry_SYSCALL_64_after_hwframe+0 Unidad x44/0xae fue creado en: slab_alloc_node mm/slub.c:3221 [en l\u00ednea] slab_alloc mm/slub.c:3230 [en l\u00ednea] kmem_cache_alloc+0x751/0xff0 mm/slub.c:3235 mpol_new mm/mempolicy.c:293 [en l\u00ednea] do_mbind +0x912/0x15f0 mm/mempolicy.c:1289 kernel_mbind mm/mempolicy.c:1483 [en l\u00ednea] __do_sys_mbind mm/mempolicy.c:1490 [en l\u00ednea] __se_sys_mbind+0x437/0xb80 mm/mempolicy.c:1486 __x64_sys_mbind+0 x19d/0x200 mm/mempolicy.c:1486 do_syscall_x64 arch/x86/entry/common.c:51 [en l\u00ednea] do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82 Entry_SYSCALL_64_after_hwframe+0x44/0xae ======= =============================================== P\u00e1nico del kernel - no sincronizaci\u00f3n: p\u00e1nico_on_kmsan set... CPU: 0 PID: 15049 Comm: syz-executor.0 Contaminado: GB 5.15.0-rc2-syzkaller #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/ Seguimiento de llamadas de 2011: __dump_stack lib/dump_stack.c:88 [en l\u00ednea] dump_stack_lvl+0x1ff/0x28e lib/dump_stack.c:106 dump_stack+0x25/0x28 lib/dump_stack.c:113 p\u00e1nico+0x44f/0xdeb kernel/panic.c: 232 kmsan_report+0x2ee/0x300 mm/kmsan/report.c:186 __msan_warning+0xd7/0x150 mm/kmsan/instrumentation.c:208 __mpol_equal+0x567/0x590 mm/mempolicy.c:2260 mpol_equal include/linux/mempolicy.h: 105 [en l\u00ednea] vma_merge+0x4a1/0x1e60 mm/mmap.c:1190 mbind_range+0xcc8/0x1e80 mm/mempolicy.c:811 do_mbind+0xf42/0x15f0 mm/mempolicy.c:1333 kernel_mbind mm/mempolicy.c:1483 [en l\u00ednea ] __do_sys_mbind mm/mempolicy.c:1490 [en l\u00ednea] __se_sys_mbind+0x437/0xb80 mm/mempolicy.c:1486 __x64_sys_mbind+0x19d/0x200 mm/mempolicy.c:1486 do_syscall_x64 arch/x86/entry/common. c:51 [en l\u00ednea ] do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82 Entry_SYSCALL_64_after_hwframe+0x44/0xae"}], "id": "CVE-2021-47462", "lastModified": "2026-06-17T04:17:31.863", "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-2021-47462", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-05-22T19:48:07.390031Z", "version": "2.0.3"}}]}, "published": "2024-05-22T07:15:11.117", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6d2aec9e123bb9c49cb5c7fc654f25f81e688e8c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9ee4e9ae98f1f262d6fae0d266cfdf3ba2c321d9"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6d2aec9e123bb9c49cb5c7fc654f25f81e688e8c"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9ee4e9ae98f1f262d6fae0d266cfdf3ba2c321d9"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-908"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: mm/mempolicy: do not allow illegal MPOL_F_NUMA_BALANCING | MPOL_LOCAL in mbind()", "id": "2282895", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282895"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-665", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nmm/mempolicy: do not allow illegal MPOL_F_NUMA_BALANCING | MPOL_LOCAL in mbind()\nsyzbot reported access to unitialized memory in mbind() [1]\nIssue came with commit bda420b98505 (\"numa balancing: migrate on fault\namong multiple bound nodes\")\nThis commit added a new bit in MPOL_MODE_FLAGS, but only checked valid\ncombination (MPOL_F_NUMA_BALANCING can only be used with MPOL_BIND) in\ndo_set_mempolicy()\nThis patch moves the check in sanitize_mpol_flags() so that it is also\nused by mbind()\n[1]\nBUG: KMSAN: uninit-value in __mpol_equal+0x567/0x590 mm/mempolicy.c:2260\n__mpol_equal+0x567/0x590 mm/mempolicy.c:2260\nmpol_equal include/linux/mempolicy.h:105 [inline]\nvma_merge+0x4a1/0x1e60 mm/mmap.c:1190\nmbind_range+0xcc8/0x1e80 mm/mempolicy.c:811\ndo_mbind+0xf42/0x15f0 mm/mempolicy.c:1333\nkernel_mbind mm/mempolicy.c:1483 [inline]\n__do_sys_mbind mm/mempolicy.c:1490 [inline]\n__se_sys_mbind+0x437/0xb80 mm/mempolicy.c:1486\n__x64_sys_mbind+0x19d/0x200 mm/mempolicy.c:1486\ndo_syscall_x64 arch/x86/entry/common.c:51 [inline]\ndo_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82\nentry_SYSCALL_64_after_hwframe+0x44/0xae\nUninit was created at:\nslab_alloc_node mm/slub.c:3221 [inline]\nslab_alloc mm/slub.c:3230 [inline]\nkmem_cache_alloc+0x751/0xff0 mm/slub.c:3235\nmpol_new mm/mempolicy.c:293 [inline]\ndo_mbind+0x912/0x15f0 mm/mempolicy.c:1289\nkernel_mbind mm/mempolicy.c:1483 [inline]\n__do_sys_mbind mm/mempolicy.c:1490 [inline]\n__se_sys_mbind+0x437/0xb80 mm/mempolicy.c:1486\n__x64_sys_mbind+0x19d/0x200 mm/mempolicy.c:1486\ndo_syscall_x64 arch/x86/entry/common.c:51 [inline]\ndo_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82\nentry_SYSCALL_64_after_hwframe+0x44/0xae\n=====================================================\nKernel panic - not syncing: panic_on_kmsan set ...\nCPU: 0 PID: 15049 Comm: syz-executor.0 Tainted: G B 5.15.0-rc2-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\nCall Trace:\n__dump_stack lib/dump_stack.c:88 [inline]\ndump_stack_lvl+0x1ff/0x28e lib/dump_stack.c:106\ndump_stack+0x25/0x28 lib/dump_stack.c:113\npanic+0x44f/0xdeb kernel/panic.c:232\nkmsan_report+0x2ee/0x300 mm/kmsan/report.c:186\n__msan_warning+0xd7/0x150 mm/kmsan/instrumentation.c:208\n__mpol_equal+0x567/0x590 mm/mempolicy.c:2260\nmpol_equal include/linux/mempolicy.h:105 [inline]\nvma_merge+0x4a1/0x1e60 mm/mmap.c:1190\nmbind_range+0xcc8/0x1e80 mm/mempolicy.c:811\ndo_mbind+0xf42/0x15f0 mm/mempolicy.c:1333\nkernel_mbind mm/mempolicy.c:1483 [inline]\n__do_sys_mbind mm/mempolicy.c:1490 [inline]\n__se_sys_mbind+0x437/0xb80 mm/mempolicy.c:1486\n__x64_sys_mbind+0x19d/0x200 mm/mempolicy.c:1486\ndo_syscall_x64 arch/x86/entry/common.c:51 [inline]\ndo_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82\nentry_SYSCALL_64_after_hwframe+0x44/0xae"], "name": "CVE-2021-47462", "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "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": "2024-05-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47462\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47462\nhttps://lore.kernel.org/linux-cve-announce/2024052225-CVE-2021-47462-f177@gregkh/T"], "threat_severity": "Low"}

{}