{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2021-47462", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-47462", "idYear": 2021, "status": "PUBLISHED", "publishedAt": "2024-05-22T06:23:23.034Z", "updatedAt": "2026-05-11T13:55:11.463Z", "importedAt": "2026-10-24T01:56:36.661Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "mm/mempolicy: do not allow illegal MPOL_F_NUMA_BALANCING | MPOL_LOCAL in mbind()", "summary": "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": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "bda420b985054a3badafef23807c4b4fa38a3dff", "status": "affected", "versionType": "git", "lessThan": "9ee4e9ae98f1f262d6fae0d266cfdf3ba2c321d9" }, { "version": "bda420b985054a3badafef23807c4b4fa38a3dff", "status": "affected", "versionType": "git", "lessThan": "6d2aec9e123bb9c49cb5c7fc654f25f81e688e8c" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "5.12", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "5.12" }, { "version": "5.14.15", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.14.*" }, { "version": "5.15", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }