{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2023-53624",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2023-53624"
  ],
  "published": "2025-10-07T15:20:13Z",
  "summary": "net/sched: sch_fq: fix integer overflow of \"credit\"",
  "details": "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's not an infinite loop,\nbut \"credit\" wasn't 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",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.21-1+rpt1"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v6",
            "binary_version": "1:6.1.21-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v7",
            "binary_version": "1:6.1.21-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v7l",
            "binary_version": "1:6.1.21-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v8",
            "binary_version": "1:6.1.21-1+rpt1"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.21-1+rpt1": {
            "linux_commit": "0afb5e98488aed7017b9bf321b575d0177feb7ed",
            "upstream_version": "6.1.21",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.28"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-53624"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4b8a05e3801661a0438fcd0cdef181030d966a5a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d0b43125ec892aeb1b03e5df5aab595097da225a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4fbefeab88c6e79753a25099d455d3d59d2946b4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/85f24cb2f10b2b0f2882e5786a09b4790bb3a0ad"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2322462d6f9ad4874f4e3c63df3b5cc00cb1acbd"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7041101ff6c3073fd8f2e99920f535b111c929cb"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}