CVE - CVE-2021-47217

CVE-ID
CVE-2021-47217	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
In the Linux kernel, the following vulnerability has been resolved: x86/hyperv: Fix NULL deref in set_hv_tscchange_cb() if Hyper-V setup fails Check for a valid hv_vp_index array prior to derefencing hv_vp_index when setting Hyper-V's TSC change callback. If Hyper-V setup failed in hyperv_init(), the kernel will still report that it's running under Hyper-V, but will have silently disabled nearly all functionality. BUG: kernel NULL pointer dereference, address: 0000000000000010 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] SMP CPU: 4 PID: 1 Comm: swapper/0 Not tainted 5.15.0-rc2+ #75 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 RIP: 0010:set_hv_tscchange_cb+0x15/0xa0 Code: <8b> 04 82 8b 15 12 17 85 01 48 c1 e0 20 48 0d ee 00 01 00 f6 c6 08 ... Call Trace: kvm_arch_init+0x17c/0x280 kvm_init+0x31/0x330 vmx_init+0xba/0x13a do_one_initcall+0x41/0x1c0 kernel_init_freeable+0x1f2/0x23b kernel_init+0x16/0x120 ret_from_fork+0x22/0x30
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/8823ea27fff6084bbb4bc71d15378fae0220b1d8 URL:https://git.kernel.org/stable/c/8823ea27fff6084bbb4bc71d15378fae0220b1d8 MISC:https://git.kernel.org/stable/c/9c177eee116cf888276d3748cb176e72562cfd5c URL:https://git.kernel.org/stable/c/9c177eee116cf888276d3748cb176e72562cfd5c MISC:https://git.kernel.org/stable/c/b0e44dfb4e4c699cca33ede431b8d127e6e8d661 URL:https://git.kernel.org/stable/c/b0e44dfb4e4c699cca33ede431b8d127e6e8d661 MISC:https://git.kernel.org/stable/c/b20ec58f8a6f4fef32cc71480ddf824584e24743 URL:https://git.kernel.org/stable/c/b20ec58f8a6f4fef32cc71480ddf824584e24743 MISC:https://git.kernel.org/stable/c/daf972118c517b91f74ff1731417feb4270625a4 URL:https://git.kernel.org/stable/c/daf972118c517b91f74ff1731417feb4270625a4
Assigning CNA
kernel.org
Date Record Created
20240410	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240410)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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