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CVE-2025-21971

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
01/04/2025
Last modified:
03/11/2025

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> net_sched: Prevent creation of classes with TC_H_ROOT<br /> <br /> The function qdisc_tree_reduce_backlog() uses TC_H_ROOT as a termination<br /> condition when traversing up the qdisc tree to update parent backlog<br /> counters. However, if a class is created with classid TC_H_ROOT, the<br /> traversal terminates prematurely at this class instead of reaching the<br /> actual root qdisc, causing parent statistics to be incorrectly maintained.<br /> In case of DRR, this could lead to a crash as reported by Mingi Cho.<br /> <br /> Prevent the creation of any Qdisc class with classid TC_H_ROOT<br /> (0xFFFFFFFF) across all qdisc types, as suggested by Jamal.

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:*:*:*:*:*:*:*:* 2.6.26 (including) 5.4.292 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.5 (including) 5.10.236 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.11 (including) 5.15.180 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.16 (including) 6.1.132 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.2 (including) 6.6.84 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.7 (including) 6.12.20 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.13 (including) 6.13.8 (excluding)
cpe:2.3:o:linux:linux_kernel:2.6.25:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc6:*:*:*:*:*:*

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


References to Advisories, Solutions, and Tools