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In the Linux kernel, the following vulnerability has been...

Moderate severity Unreviewed Published Feb 28, 2024 to the GitHub Advisory Database • Updated Dec 9, 2024

Package

No package listed— Suggest a package

Affected versions

Unknown

Patched versions

Unknown

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 ]---

References

Published by the National Vulnerability Database Feb 28, 2024
Published to the GitHub Advisory Database Feb 28, 2024
Last updated Dec 9, 2024

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS score

0.042%
(5th percentile)

Weaknesses

CVE ID

CVE-2021-47005

GHSA ID

GHSA-43jg-wxfj-4rf7

Source code

No known source code

Dependabot alerts are not supported on this advisory because it does not have a package from a supported ecosystem with an affected and fixed version.

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