Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2023-53624

Severity CVSS v4.0:
Pending analysis
Type:
CWE-190 Integer Overflow or Wraparound
Publication date:
07/10/2025
Last modified:
05/02/2026

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> net/sched: sch_fq: fix integer overflow of "credit"<br /> <br /> if sch_fq is configured with "initial quantum" having values greater than<br /> INT_MAX, the first assignment of "credit" does signed integer overflow to<br /> a very negative value.<br /> In this situation, the syzkaller script provided by Cristoph triggers the<br /> CPU soft-lockup warning even with few sockets. It&amp;#39;s not an infinite loop,<br /> but "credit" wasn&amp;#39;t probably meant to be minus 2Gb for each new flow.<br /> Capping "initial quantum" to INT_MAX proved to fix the issue.<br /> <br /> v2: validation of "initial quantum" is done in fq_policy, instead of open<br /> coding in fq_change() _ suggested by Jakub Kicinski

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:*:*:*:*:*:*:*:* 3.12 (including) 5.10.180 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.11 (including) 5.15.111 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.16 (including) 6.1.28 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.2 (including) 6.2.15 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.3 (including) 6.3.2 (excluding)

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


References to Advisories, Solutions, and Tools