{ "dataType": "CVE_RECORD", "dataVersion": "5.1", "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": "2024-08-04T05:39:59.432Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2024-05-29T05:08:21.734Z" }, "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": "bda420b98505", "lessThan": "9ee4e9ae98f1", "status": "affected", "versionType": "git" }, { "version": "bda420b98505", "lessThan": "6d2aec9e123b", "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": "custom" }, { "version": "5.14.15", "lessThanOrEqual": "5.14.*", "status": "unaffected", "versionType": "custom" }, { "version": "5.15", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "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-a5840b7849dd" } }, "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" ] } ] } ] } }