Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2021-46952

Severity CVSS v4.0:
Pending analysis
Type:
CWE-125 Out-of-bounds Read
Publication date:
27/02/2024
Last modified:
10/04/2024

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> NFS: fs_context: validate UDP retrans to prevent shift out-of-bounds<br /> <br /> Fix shift out-of-bounds in xprt_calc_majortimeo(). This is caused<br /> by a garbage timeout (retrans) mount option being passed to nfs mount,<br /> in this case from syzkaller.<br /> <br /> If the protocol is XPRT_TRANSPORT_UDP, then &amp;#39;retrans&amp;#39; is a shift<br /> value for a 64-bit long integer, so &amp;#39;retrans&amp;#39; cannot be &gt;= 64.<br /> If it is &gt;= 64, fail the mount and return an error.

Impact

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

Base Score: 7.10 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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): High
Integrity (I): None
Availability (A): High

Base Score 3.x
7.10
Severity 3.x
HIGH

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.6.0 (including) 5.10.36 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.11.0 (including) 5.11.20 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.12.0 (including) 5.12.3 (excluding)

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


References to Advisories, Solutions, and Tools