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        "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": "2024-08-04T05:32:07.432Z"
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                "dateUpdated": "2024-05-29T05:04:05.021Z"
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                    "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"
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                    "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": "93286261de1b",
                            "lessThan": "b20ec58f8a6f",
                            "status": "affected",
                            "versionType": "git"
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                        {
                            "version": "93286261de1b",
                            "lessThan": "b0e44dfb4e4c",
                            "status": "affected",
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                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
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                        {
                            "version": "4.16",
                            "status": "affected"
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                        {
                            "version": "0",
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                            "status": "unaffected",
                            "versionType": "custom"
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                        {
                            "version": "4.19.218",
                            "lessThanOrEqual": "4.19.*",
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                        {
                            "version": "5.4.162",
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                            "version": "5.16",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
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                    "url": "https://git.kernel.org/stable/c/b20ec58f8a6f4fef32cc71480ddf824584e24743"
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                {
                    "url": "https://git.kernel.org/stable/c/daf972118c517b91f74ff1731417feb4270625a4"
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            "title": "x86/hyperv: Fix NULL deref in set_hv_tscchange_cb() if Hyper-V setup fails",
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