CVE-2021-47005
Linux PCI Endpoint Null Pointer Dereference
Description
In the Linux kernel, the following vulnerability has been resolved: PCI: endpoint: Fix NULL pointer dereference for ->get_features() get_features ops of pci_epc_ops may return NULL, causing NULL pointer dereference in pci_epf_test_alloc_space function. Let us add a check for pci_epc_feature pointer in pci_epf_test_bind before we access it to avoid any such NULL pointer dereference and return -ENOTSUPP in case pci_epc_feature is not found. When the patch is not applied and EPC features is not implemented in the platform driver, we see the following dump due to kernel NULL pointer dereference. Call trace: pci_epf_test_bind+0xf4/0x388 pci_epf_bind+0x3c/0x80 pci_epc_epf_link+0xa8/0xcc configfs_symlink+0x1a4/0x48c vfs_symlink+0x104/0x184 do_symlinkat+0x80/0xd4 __arm64_sys_symlinkat+0x1c/0x24 el0_svc_common.constprop.3+0xb8/0x170 el0_svc_handler+0x70/0x88 el0_svc+0x8/0x640 Code: d2800581 b9403ab9 f9404ebb 8b394f60 (f9400400) ---[ end trace a438e3c5a24f9df0 ]---
INFO
Published Date :
Feb. 28, 2024, 9:15 a.m.
Last Modified :
Dec. 9, 2024, 6:23 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 to the latest versions.
- Reboot the system after updating the kernel packages.
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-2021-47005.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47005 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-2021-47005
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-2021-47005 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47005 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]
Dec. 09, 2024
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) 5.1 up to (excluding) 5.10.38 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.11.22 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.12 up to (excluding) 5.12.5 Changed Reference Type https://git.kernel.org/stable/c/0169d4f0bee44fdfef908c13ed21fcb326c38695 No Types Assigned https://git.kernel.org/stable/c/0169d4f0bee44fdfef908c13ed21fcb326c38695 Patch Changed Reference Type https://git.kernel.org/stable/c/0169d4f0bee44fdfef908c13ed21fcb326c38695 No Types Assigned https://git.kernel.org/stable/c/0169d4f0bee44fdfef908c13ed21fcb326c38695 Patch Changed Reference Type https://git.kernel.org/stable/c/6613bc2301ba291a1c5a90e1dc24cf3edf223c03 No Types Assigned https://git.kernel.org/stable/c/6613bc2301ba291a1c5a90e1dc24cf3edf223c03 Patch Changed Reference Type https://git.kernel.org/stable/c/6613bc2301ba291a1c5a90e1dc24cf3edf223c03 No Types Assigned https://git.kernel.org/stable/c/6613bc2301ba291a1c5a90e1dc24cf3edf223c03 Patch Changed Reference Type https://git.kernel.org/stable/c/679ebad058b8168f10e63876d63b0877fd2fe784 No Types Assigned https://git.kernel.org/stable/c/679ebad058b8168f10e63876d63b0877fd2fe784 Patch Changed Reference Type https://git.kernel.org/stable/c/679ebad058b8168f10e63876d63b0877fd2fe784 No Types Assigned https://git.kernel.org/stable/c/679ebad058b8168f10e63876d63b0877fd2fe784 Patch Changed Reference Type https://git.kernel.org/stable/c/bbed83d7060e07a5d309104d25a00f0a24441428 No Types Assigned https://git.kernel.org/stable/c/bbed83d7060e07a5d309104d25a00f0a24441428 Patch Changed Reference Type https://git.kernel.org/stable/c/bbed83d7060e07a5d309104d25a00f0a24441428 No Types Assigned https://git.kernel.org/stable/c/bbed83d7060e07a5d309104d25a00f0a24441428 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/0169d4f0bee44fdfef908c13ed21fcb326c38695 Added Reference https://git.kernel.org/stable/c/6613bc2301ba291a1c5a90e1dc24cf3edf223c03 Added Reference https://git.kernel.org/stable/c/679ebad058b8168f10e63876d63b0877fd2fe784 Added Reference https://git.kernel.org/stable/c/bbed83d7060e07a5d309104d25a00f0a24441428 -
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
Feb. 28, 2024
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: PCI: endpoint: Fix NULL pointer dereference for ->get_features() get_features ops of pci_epc_ops may return NULL, causing NULL pointer dereference in pci_epf_test_alloc_space function. Let us add a check for pci_epc_feature pointer in pci_epf_test_bind before we access it to avoid any such NULL pointer dereference and return -ENOTSUPP in case pci_epc_feature is not found. When the patch is not applied and EPC features is not implemented in the platform driver, we see the following dump due to kernel NULL pointer dereference. Call trace: pci_epf_test_bind+0xf4/0x388 pci_epf_bind+0x3c/0x80 pci_epc_epf_link+0xa8/0xcc configfs_symlink+0x1a4/0x48c vfs_symlink+0x104/0x184 do_symlinkat+0x80/0xd4 __arm64_sys_symlinkat+0x1c/0x24 el0_svc_common.constprop.3+0xb8/0x170 el0_svc_handler+0x70/0x88 el0_svc+0x8/0x640 Code: d2800581 b9403ab9 f9404ebb 8b394f60 (f9400400) ---[ end trace a438e3c5a24f9df0 ]--- Added Reference Linux https://git.kernel.org/stable/c/bbed83d7060e07a5d309104d25a00f0a24441428 [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/679ebad058b8168f10e63876d63b0877fd2fe784 [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/0169d4f0bee44fdfef908c13ed21fcb326c38695 [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/6613bc2301ba291a1c5a90e1dc24cf3edf223c03 [No types assigned]