{"id":"CVE-2021-47217","details":"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: \u003c8b\u003e 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","modified":"2026-03-13T05:20:37.890774Z","published":"2024-04-10T19:15:48.813Z","related":["SUSE-SU-2024:1641-1","SUSE-SU-2024:1643-1","SUSE-SU-2024:1644-1","SUSE-SU-2024:1646-1","SUSE-SU-2024:1647-1","SUSE-SU-2024:1659-1","SUSE-SU-2024:1663-1","SUSE-SU-2024:1870-1"],"references":[{"type":"FIX","url":"https://git.kernel.org/stable/c/8823ea27fff6084bbb4bc71d15378fae0220b1d8"},{"type":"FIX","url":"https://git.kernel.org/stable/c/9c177eee116cf888276d3748cb176e72562cfd5c"},{"type":"FIX","url":"https://git.kernel.org/stable/c/b0e44dfb4e4c699cca33ede431b8d127e6e8d661"},{"type":"FIX","url":"https://git.kernel.org/stable/c/b20ec58f8a6f4fef32cc71480ddf824584e24743"},{"type":"FIX","url":"https://git.kernel.org/stable/c/daf972118c517b91f74ff1731417feb4270625a4"}],"affected":[{"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-47217.json","unresolved_ranges":[{"events":[{"introduced":"4.16"},{"fixed":"4.19.218"}]},{"events":[{"introduced":"4.20"},{"fixed":"5.4.162"}]},{"events":[{"introduced":"5.5"},{"fixed":"5.10.82"}]},{"events":[{"introduced":"5.11"},{"fixed":"5.15.5"}]},{"events":[{"introduced":"0"},{"last_affected":"5.16-rc1"}]}]}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}