Answer in brief
CVE-2023-53624 records a Medium severity (CVSS 5.5) vulnerability in net/sched: sch_fq: fix integer overflow of "credit". The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=afe4fd062416b158a8a8538b23adc1930a9b88dc <4b8a05e3801661a0438fcd0cdef181030d966a5a || >=afe4fd062416b158a8a8538b23adc1930a9b88dc <d0b43125ec892aeb1b03e5df5aab595097da225a || >=afe4fd062416b158a8a8538b23adc1930a9b88dc <4fbefeab88c6e79753a25099d455d3d59d2946b4 || >=afe4fd062416b158a8a8538b23adc1930a9b88dc <85f24cb2f10b2b0f2882e5786a09b4790bb3a0ad || >=afe4fd062416b158a8a8538b23adc1930a9b88dc <2322462d6f9ad4874f4e3c63df3b5cc00cb1acbd || >=afe4fd062416b158a8a8538b23adc1930a9b88dc <7041101ff6c3073fd8f2e99920f535b111c929cb | 4b8a05e3801661a0438fcd0cdef181030d966a5a, d0b43125ec892aeb1b03e5df5aab595097da225a, 4fbefeab88c6e79753a25099d455d3d59d2946b4, 85f24cb2f10b2b0f2882e5786a09b4790bb3a0ad, 2322462d6f9ad4874f4e3c63df3b5cc00cb1acbd, 7041101ff6c3073fd8f2e99920f535b111c929cb |
| Linux/Linuxgeneric | 3.12 | Not reported |
Published upstream
Oct 7, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Nov 5, 2026
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
Quoted source text, attributed separately from HOL analysis.