{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2"
            },
            {
              "fixed": "ad8e8fec40290a8c8cf145c0deaadf76f80c5163"
            },
            {
              "fixed": "ab1ff5890c7354afc7be56502fcfbd61f3b7ae4f"
            },
            {
              "fixed": "25b6821884713a31e2b49fb67b0ebd765b33e0a9"
            },
            {
              "fixed": "c56f78614e7781aaceca9bd3cb2128bf7d45c3bd"
            },
            {
              "fixed": "b9e6431cbea8bb1fae8069ed099b4ee100499835"
            },
            {
              "fixed": "17c1b9807b8a67d676b6dcf749ee932ebaa7f568"
            },
            {
              "fixed": "d0aefec1b1a1ba2c1d251028dc2c4e5b4ce1fea5"
            },
            {
              "fixed": "4576100b8cd03118267513cafacde164b498b322"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.12"
            },
            {
              "fixed": "5.10.253"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.203"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.168"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.134"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.81"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.22"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.12"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31423.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_hfsc: fix divide-by-zero in rtsc_min()\n\nm2sm() converts a u32 slope to a u64 scaled value.  For large inputs\n(e.g. m1=4000000000), the result can reach 2^32.  rtsc_min() stores\nthe difference of two such u64 values in a u32 variable `dsm` and\nuses it as a divisor.  When the difference is exactly 2^32 the\ntruncation yields zero, causing a divide-by-zero oops in the\nconcave-curve intersection path:\n\n  Oops: divide error: 0000\n  RIP: 0010:rtsc_min (net/sched/sch_hfsc.c:601)\n  Call Trace:\n   init_ed (net/sched/sch_hfsc.c:629)\n   hfsc_enqueue (net/sched/sch_hfsc.c:1569)\n   [...]\n\nWiden `dsm` to u64 and replace do_div() with div64_u64() so the full\ndifference is preserved.",
  "id": "CVE-2026-31423",
  "modified": "2026-07-08T05:38:09.020435714Z",
  "published": "2026-04-13T13:40:26.567Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/17c1b9807b8a67d676b6dcf749ee932ebaa7f568"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/25b6821884713a31e2b49fb67b0ebd765b33e0a9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4576100b8cd03118267513cafacde164b498b322"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ab1ff5890c7354afc7be56502fcfbd61f3b7ae4f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ad8e8fec40290a8c8cf145c0deaadf76f80c5163"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b9e6431cbea8bb1fae8069ed099b4ee100499835"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c56f78614e7781aaceca9bd3cb2128bf7d45c3bd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d0aefec1b1a1ba2c1d251028dc2c4e5b4ce1fea5"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31423.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31423"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "summary": "net/sched: sch_hfsc: fix divide-by-zero in rtsc_min()"
}