Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2021-47218

Severity CVSS v4.0:
Pending analysis
Type:
CWE-476 NULL Pointer Dereference
Publication date:
10/04/2024
Last modified:
14/01/2025

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> selinux: fix NULL-pointer dereference when hashtab allocation fails<br /> <br /> When the hash table slot array allocation fails in hashtab_init(),<br /> h-&gt;size is left initialized with a non-zero value, but the h-&gt;htable<br /> pointer is NULL. This may then cause a NULL pointer dereference, since<br /> the policydb code relies on the assumption that even after a failed<br /> hashtab_init(), hashtab_map() and hashtab_destroy() can be safely called<br /> on it. Yet, these detect an empty hashtab only by looking at the size.<br /> <br /> Fix this by making sure that hashtab_init() always leaves behind a valid<br /> empty hashtab when the allocation fails.

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 5.50 MEDIUM
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
5.50
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.8 (including) 5.10.82 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.11 (including) 5.15.5 (excluding)
cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.16:rc2:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools