CVE-2021-47217
Hyper-V for Linux x86 NULL Pointer Dereference Vulnerability
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
INFO
Published Date :
April 10, 2024, 7:15 p.m.
Last Modified :
Jan. 14, 2025, 2:44 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update the Linux kernel packages.
- Reboot the system after update.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-47217.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47217 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-47217
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-47217 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47217 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jan. 14, 2025
Action Type Old Value New Value Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE NIST CWE-476 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.16 up to (excluding) 4.19.218 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.20 up to (excluding) 5.4.162 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up to (excluding) 5.10.82 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.5 *cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:* Changed Reference Type https://git.kernel.org/stable/c/8823ea27fff6084bbb4bc71d15378fae0220b1d8 No Types Assigned https://git.kernel.org/stable/c/8823ea27fff6084bbb4bc71d15378fae0220b1d8 Patch Changed Reference Type https://git.kernel.org/stable/c/8823ea27fff6084bbb4bc71d15378fae0220b1d8 No Types Assigned https://git.kernel.org/stable/c/8823ea27fff6084bbb4bc71d15378fae0220b1d8 Patch Changed Reference Type https://git.kernel.org/stable/c/9c177eee116cf888276d3748cb176e72562cfd5c No Types Assigned https://git.kernel.org/stable/c/9c177eee116cf888276d3748cb176e72562cfd5c Patch Changed Reference Type https://git.kernel.org/stable/c/9c177eee116cf888276d3748cb176e72562cfd5c No Types Assigned https://git.kernel.org/stable/c/9c177eee116cf888276d3748cb176e72562cfd5c Patch Changed Reference Type https://git.kernel.org/stable/c/b0e44dfb4e4c699cca33ede431b8d127e6e8d661 No Types Assigned https://git.kernel.org/stable/c/b0e44dfb4e4c699cca33ede431b8d127e6e8d661 Patch Changed Reference Type https://git.kernel.org/stable/c/b0e44dfb4e4c699cca33ede431b8d127e6e8d661 No Types Assigned https://git.kernel.org/stable/c/b0e44dfb4e4c699cca33ede431b8d127e6e8d661 Patch Changed Reference Type https://git.kernel.org/stable/c/b20ec58f8a6f4fef32cc71480ddf824584e24743 No Types Assigned https://git.kernel.org/stable/c/b20ec58f8a6f4fef32cc71480ddf824584e24743 Patch Changed Reference Type https://git.kernel.org/stable/c/b20ec58f8a6f4fef32cc71480ddf824584e24743 No Types Assigned https://git.kernel.org/stable/c/b20ec58f8a6f4fef32cc71480ddf824584e24743 Patch Changed Reference Type https://git.kernel.org/stable/c/daf972118c517b91f74ff1731417feb4270625a4 No Types Assigned https://git.kernel.org/stable/c/daf972118c517b91f74ff1731417feb4270625a4 Patch Changed Reference Type https://git.kernel.org/stable/c/daf972118c517b91f74ff1731417feb4270625a4 No Types Assigned https://git.kernel.org/stable/c/daf972118c517b91f74ff1731417feb4270625a4 Patch -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/8823ea27fff6084bbb4bc71d15378fae0220b1d8 Added Reference https://git.kernel.org/stable/c/9c177eee116cf888276d3748cb176e72562cfd5c Added Reference https://git.kernel.org/stable/c/b0e44dfb4e4c699cca33ede431b8d127e6e8d661 Added Reference https://git.kernel.org/stable/c/b20ec58f8a6f4fef32cc71480ddf824584e24743 Added Reference https://git.kernel.org/stable/c/daf972118c517b91f74ff1731417feb4270625a4 -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2024
Action Type Old Value New Value -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 14, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Apr. 10, 2024
Action Type Old Value New Value Added 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 Added Reference kernel.org https://git.kernel.org/stable/c/b20ec58f8a6f4fef32cc71480ddf824584e24743 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/b0e44dfb4e4c699cca33ede431b8d127e6e8d661 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/9c177eee116cf888276d3748cb176e72562cfd5c [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/8823ea27fff6084bbb4bc71d15378fae0220b1d8 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/daf972118c517b91f74ff1731417feb4270625a4 [No types assigned]