CVE-2023-53624

MEDIUM EPSS 8.5%
Published Oct 7, 20258mo ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Oct 7, 2025 8mo ago
Last Modified Jun 17, 2026 2w ago

Description

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

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
8.5% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-190 Integer Overflow or Wraparound Numeric Error

Affected Products 5

VendorProductVersionRange
linuxlinux_kernel*≥3.12  –  <5.10.180
linuxlinux_kernel*≥5.11  –  <5.15.111
linuxlinux_kernel*≥5.16  –  <6.1.28
linuxlinux_kernel*≥6.2  –  <6.2.15
linuxlinux_kernel*≥6.3  –  <6.3.2

References 6

  • git.kernel.org https://git.kernel.org/stable/c/2322462d6f9ad4874f4e3c63df3b5cc00cb1acbd
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4b8a05e3801661a0438fcd0cdef181030d966a5a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4fbefeab88c6e79753a25099d455d3d59d2946b4
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7041101ff6c3073fd8f2e99920f535b111c929cb
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/85f24cb2f10b2b0f2882e5786a09b4790bb3a0ad
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d0b43125ec892aeb1b03e5df5aab595097da225a
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/2322462d6f9ad4874f4e3c63df3b5cc00cb1acbd
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4b8a05e3801661a0438fcd0cdef181030d966a5a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4fbefeab88c6e79753a25099d455d3d59d2946b4
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7041101ff6c3073fd8f2e99920f535b111c929cb
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/85f24cb2f10b2b0f2882e5786a09b4790bb3a0ad
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d0b43125ec892aeb1b03e5df5aab595097da225a
    Patch