{ "dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": { "cveId": "CVE-2021-47230", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-04-10T18:59:19.530Z", "datePublished": "2024-05-21T14:19:33.759Z", "dateUpdated": "2024-08-04T05:32:07.459Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2024-05-29T05:04:18.640Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Immediately reset the MMU context when the SMM flag is cleared\n\nImmediately reset the MMU context when the vCPU's SMM flag is cleared so\nthat the SMM flag in the MMU role is always synchronized with the vCPU's\nflag. If RSM fails (which isn't correctly emulated), KVM will bail\nwithout calling post_leave_smm() and leave the MMU in a bad state.\n\nThe bad MMU role can lead to a NULL pointer dereference when grabbing a\nshadow page's rmap for a page fault as the initial lookups for the gfn\nwill happen with the vCPU's SMM flag (=0), whereas the rmap lookup will\nuse the shadow page's SMM flag, which comes from the MMU (=1). SMM has\nan entirely different set of memslots, and so the initial lookup can find\na memslot (SMM=0) and then explode on the rmap memslot lookup (SMM=1).\n\n general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN\n KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\n CPU: 1 PID: 8410 Comm: syz-executor382 Not tainted 5.13.0-rc5-syzkaller #0\n Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\n RIP: 0010:__gfn_to_rmap arch/x86/kvm/mmu/mmu.c:935 [inline]\n RIP: 0010:gfn_to_rmap+0x2b0/0x4d0 arch/x86/kvm/mmu/mmu.c:947\n Code: <42> 80 3c 20 00 74 08 4c 89 ff e8 f1 79 a9 00 4c 89 fb 4d 8b 37 44\n RSP: 0018:ffffc90000ffef98 EFLAGS: 00010246\n RAX: 0000000000000000 RBX: ffff888015b9f414 RCX: ffff888019669c40\n RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001\n RBP: 0000000000000001 R08: ffffffff811d9cdb R09: ffffed10065a6002\n R10: ffffed10065a6002 R11: 0000000000000000 R12: dffffc0000000000\n R13: 0000000000000003 R14: 0000000000000001 R15: 0000000000000000\n FS: 000000000124b300(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 0000000000000000 CR3: 0000000028e31000 CR4: 00000000001526e0\n DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n Call Trace:\n rmap_add arch/x86/kvm/mmu/mmu.c:965 [inline]\n mmu_set_spte+0x862/0xe60 arch/x86/kvm/mmu/mmu.c:2604\n __direct_map arch/x86/kvm/mmu/mmu.c:2862 [inline]\n direct_page_fault+0x1f74/0x2b70 arch/x86/kvm/mmu/mmu.c:3769\n kvm_mmu_do_page_fault arch/x86/kvm/mmu.h:124 [inline]\n kvm_mmu_page_fault+0x199/0x1440 arch/x86/kvm/mmu/mmu.c:5065\n vmx_handle_exit+0x26/0x160 arch/x86/kvm/vmx/vmx.c:6122\n vcpu_enter_guest+0x3bdd/0x9630 arch/x86/kvm/x86.c:9428\n vcpu_run+0x416/0xc20 arch/x86/kvm/x86.c:9494\n kvm_arch_vcpu_ioctl_run+0x4e8/0xa40 arch/x86/kvm/x86.c:9722\n kvm_vcpu_ioctl+0x70f/0xbb0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3460\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:1069 [inline]\n __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:1055\n do_syscall_64+0x3f/0xb0 arch/x86/entry/common.c:47\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n RIP: 0033:0x440ce9" } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/x86/kvm/x86.c" ], "versions": [ { "version": "9ec19493fb86", "lessThan": "cbb425f62df9", "status": "affected", "versionType": "git" }, { "version": "9ec19493fb86", "lessThan": "669a8866e468", "status": "affected", "versionType": "git" }, { "version": "9ec19493fb86", "lessThan": "df9a40cfb3be", "status": "affected", "versionType": "git" }, { "version": "9ec19493fb86", "lessThan": "78fcb2c91adf", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/x86/kvm/x86.c" ], "versions": [ { "version": "5.1", "status": "affected" }, { "version": "0", "lessThan": "5.1", "status": "unaffected", "versionType": "custom" }, { "version": "5.4.128", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "custom" }, { "version": "5.10.46", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "custom" }, { "version": "5.12.13", "lessThanOrEqual": "5.12.*", "status": "unaffected", "versionType": "custom" }, { "version": "5.13", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/cbb425f62df9df7abee4b3f068f7ed6ffc3561e2" }, { "url": "https://git.kernel.org/stable/c/669a8866e468fd020d34eb00e08cb41d3774b71b" }, { "url": "https://git.kernel.org/stable/c/df9a40cfb3be2cbeb1c17bb67c59251ba16630f3" }, { "url": "https://git.kernel.org/stable/c/78fcb2c91adfec8ce3a2ba6b4d0dda89f2f4a7c6" } ], "title": "KVM: x86: Immediately reset the MMU context when the SMM flag is cleared", "x_generator": { "engine": "bippy-a5840b7849dd" } }, "adp": [ { "problemTypes": [ { "descriptions": [ { "type": "CWE", "cweId": "CWE-476", "lang": "en", "description": "CWE-476 NULL Pointer Dereference" } ] } ], "affected": [ { "vendor": "linux", "product": "linux_kernel", "cpes": [ "cpe:2.3:a:linux:linux_kernel:-:*:*:*:*:*:*:*" ], "defaultStatus": "unknown", "versions": [ { "version": "9ec19493fb86", "status": "affected", "lessThan": "cbb425f62df9", "versionType": "custom" } ] }, { "vendor": "linux", "product": "linux_kernel", "cpes": [ "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*" ], "defaultStatus": "unknown", "versions": [ { "version": "9ec19493fb86", "status": "affected", "lessThan": "669a8866e468", "versionType": "custom" } ] }, { "vendor": "linux", "product": "linux_kernel", "cpes": [ "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*" ], "defaultStatus": "unknown", "versions": [ { "version": "9ec19493fb86", "status": "affected", "lessThan": "df9a40cfb3be", "versionType": "custom" } ] }, { "vendor": "linux", "product": "linux_kernel", "cpes": [ "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*" ], "defaultStatus": "unknown", "versions": [ { "version": "9ec19493fb86", "status": "affected", "lessThan": "78fcb2c91adf", "versionType": "custom" } ] }, { "vendor": "linux", "product": "linux_kernel", "cpes": [ "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*" ], "defaultStatus": "unknown", "versions": [ { "version": "0", "status": "unaffected", "lessThan": "5.1", "versionType": "custom" } ] }, { "vendor": "linux", "product": "linux_kernel", "cpes": [ "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*" ], "defaultStatus": "unknown", "versions": [ { "version": "5.4.128", "status": "unaffected", "lessThan": "5.5", "versionType": "custom" } ] }, { "vendor": "linux", "product": "linux_kernel", "cpes": [ "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*" ], "defaultStatus": "unknown", "versions": [ { "version": "5.10.46", "status": "unaffected", "lessThan": "5.11", "versionType": "custom" } ] }, { "vendor": "linux", "product": "linux_kernel", "cpes": [ "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*" ], "defaultStatus": "unknown", "versions": [ { "version": "5.12.13", "status": "unaffected", "lessThan": "5.13", "versionType": "custom" } ] }, { "vendor": "linux", "product": "linux_kernel", "cpes": [ "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*" ], "defaultStatus": "unknown", "versions": [ { "version": "5.13", "status": "unaffected" } ] }, { "vendor": "linux", "product": "linux_kernel", "cpes": [ "cpe:2.3:o:linux:linux_kernel:5.1:*:*:*:*:*:*:*" ], "defaultStatus": "unknown", "versions": [ { "version": "5.1", "status": "affected" } ] } ], "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 6.6, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE" } }, { "other": { "type": "ssvc", "content": { "timestamp": "2024-06-04T19:56:04.916742Z", "id": "CVE-2021-47230", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-06T19:56:39.707Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:32:07.459Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/cbb425f62df9df7abee4b3f068f7ed6ffc3561e2", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/669a8866e468fd020d34eb00e08cb41d3774b71b", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/df9a40cfb3be2cbeb1c17bb67c59251ba16630f3", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/78fcb2c91adfec8ce3a2ba6b4d0dda89f2f4a7c6", "tags": [ "x_transferred" ] } ] } ] } }