CVE-2023-53624 (GCVE-0-2023-53624)
Vulnerability from cvelistv5
Published
2025-10-07 15:19
Modified
2025-10-07 15:19
Severity ?
Summary
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
References
Impacted products
Vendor Product Version
Linux Linux Version: afe4fd062416b158a8a8538b23adc1930a9b88dc
Version: afe4fd062416b158a8a8538b23adc1930a9b88dc
Version: afe4fd062416b158a8a8538b23adc1930a9b88dc
Version: afe4fd062416b158a8a8538b23adc1930a9b88dc
Version: afe4fd062416b158a8a8538b23adc1930a9b88dc
Version: afe4fd062416b158a8a8538b23adc1930a9b88dc
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_fq: fix integer overflow of \"credit\"\n\nif sch_fq is configured with \"initial quantum\" having values greater than\nINT_MAX, the first assignment of \"credit\" does signed integer overflow to\na very negative value.\nIn this situation, the syzkaller script provided by Cristoph triggers the\nCPU soft-lockup warning even with few sockets. It\u0027s not an infinite loop,\nbut \"credit\" wasn\u0027t probably meant to be minus 2Gb for each new flow.\nCapping \"initial quantum\" to INT_MAX proved to fix the issue.\n\nv2: validation of \"initial quantum\" is done in fq_policy, instead of open\n    coding in fq_change() _ suggested by Jakub Kicinski"
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        "shortName": "Linux"
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    "dateReserved": "2025-10-07T15:16:59.655Z",
    "dateUpdated": "2025-10-07T15:19:29.545Z",
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  }
}


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