{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2021-47217", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-04-10T18:59:19.528Z", "datePublished": "2024-04-10T19:01:56.419Z", "dateUpdated": "2026-05-11T13:50:14.845Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T13:50:14.845Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/hyperv: Fix NULL deref in set_hv_tscchange_cb() if Hyper-V setup fails\n\nCheck for a valid hv_vp_index array prior to derefencing hv_vp_index when\nsetting Hyper-V's TSC change callback. If Hyper-V setup failed in\nhyperv_init(), the kernel will still report that it's running under\nHyper-V, but will have silently disabled nearly all functionality.\n\n BUG: kernel NULL pointer dereference, address: 0000000000000010\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 0 P4D 0\n Oops: 0000 [#1] SMP\n CPU: 4 PID: 1 Comm: swapper/0 Not tainted 5.15.0-rc2+ #75\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\n RIP: 0010:set_hv_tscchange_cb+0x15/0xa0\n Code: <8b> 04 82 8b 15 12 17 85 01 48 c1 e0 20 48 0d ee 00 01 00 f6 c6 08\n ...\n Call Trace:\n kvm_arch_init+0x17c/0x280\n kvm_init+0x31/0x330\n vmx_init+0xba/0x13a\n do_one_initcall+0x41/0x1c0\n kernel_init_freeable+0x1f2/0x23b\n kernel_init+0x16/0x120\n ret_from_fork+0x22/0x30" } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/x86/hyperv/hv_init.c" ], "versions": [ { "version": "93286261de1b46339aa27cd4c639b21778f6cade", "lessThan": "b20ec58f8a6f4fef32cc71480ddf824584e24743", "status": "affected", "versionType": "git" }, { "version": "93286261de1b46339aa27cd4c639b21778f6cade", "lessThan": "b0e44dfb4e4c699cca33ede431b8d127e6e8d661", "status": "affected", "versionType": "git" }, { "version": "93286261de1b46339aa27cd4c639b21778f6cade", "lessThan": "9c177eee116cf888276d3748cb176e72562cfd5c", "status": "affected", "versionType": "git" }, { "version": "93286261de1b46339aa27cd4c639b21778f6cade", "lessThan": "8823ea27fff6084bbb4bc71d15378fae0220b1d8", "status": "affected", "versionType": "git" }, { "version": "93286261de1b46339aa27cd4c639b21778f6cade", "lessThan": "daf972118c517b91f74ff1731417feb4270625a4", "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/hyperv/hv_init.c" ], "versions": [ { "version": "4.16", "status": "affected" }, { "version": "0", "lessThan": "4.16", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.218", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.162", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.82", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.5", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.16", "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": "4.16", "versionEndExcluding": "4.19.218" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "5.4.162" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "5.10.82" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "5.15.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "5.16" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/b20ec58f8a6f4fef32cc71480ddf824584e24743" }, { "url": "https://git.kernel.org/stable/c/b0e44dfb4e4c699cca33ede431b8d127e6e8d661" }, { "url": "https://git.kernel.org/stable/c/9c177eee116cf888276d3748cb176e72562cfd5c" }, { "url": "https://git.kernel.org/stable/c/8823ea27fff6084bbb4bc71d15378fae0220b1d8" }, { "url": "https://git.kernel.org/stable/c/daf972118c517b91f74ff1731417feb4270625a4" } ], "title": "x86/hyperv: Fix NULL deref in set_hv_tscchange_cb() if Hyper-V setup fails", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2024-06-17T18:03:45.646426Z", "id": "CVE-2021-47217", "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": "2024-06-17T18:04:39.738Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:32:07.432Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/b20ec58f8a6f4fef32cc71480ddf824584e24743", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/b0e44dfb4e4c699cca33ede431b8d127e6e8d661", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/9c177eee116cf888276d3748cb176e72562cfd5c", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/8823ea27fff6084bbb4bc71d15378fae0220b1d8", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/daf972118c517b91f74ff1731417feb4270625a4", "tags": [ "x_transferred" ] } ] } ] } }