Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2021-46905

Severity CVSS v4.0:
Pending analysis
Type:
CWE-476 NULL Pointer Dereference
Publication date:
26/02/2024
Last modified:
17/04/2024

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> net: hso: fix NULL-deref on disconnect regression<br /> <br /> Commit 8a12f8836145 ("net: hso: fix null-ptr-deref during tty device<br /> unregistration") fixed the racy minor allocation reported by syzbot, but<br /> introduced an unconditional NULL-pointer dereference on every disconnect<br /> instead.<br /> <br /> Specifically, the serial device table must no longer be accessed after<br /> the minor has been released by hso_serial_tty_unregister().

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:*:*:*:*:*:*:*:* 4.19.189 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 4.20.0 (including) 5.4.115 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.5.0 (including) 5.10.33 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.11.0 (including) 5.11.17 (excluding)
cpe:2.3:o:linux:linux_kernel:5.12:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.12:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.12:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.12:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.12:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.12:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.12:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.12:rc7:*:*:*:*:*:*

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


References to Advisories, Solutions, and Tools