{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.1.170-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.85-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.19.12-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  net/sched: sch_hfsc: fix divide-by-zero in rtsc_min()  m2sm() converts a u32 slope to a u64 scaled value.  For large inputs (e.g. m1=4000000000), the result can reach 2^32.  rtsc_min() stores the difference of two such u64 values in a u32 variable `dsm` and uses it as a divisor.  When the difference is exactly 2^32 the truncation yields zero, causing a divide-by-zero oops in the concave-curve intersection path:    Oops: divide error: 0000   RIP: 0010:rtsc_min (net/sched/sch_hfsc.c:601)   Call Trace:    init_ed (net/sched/sch_hfsc.c:629)    hfsc_enqueue (net/sched/sch_hfsc.c:1569)    [...]  Widen `dsm` to u64 and replace do_div() with div64_u64() so the full difference is preserved.",
  "id": "DEBIAN-CVE-2026-31423",
  "modified": "2026-09-14T16:47:41.498740633Z",
  "published": "2026-04-13T14:16:12.070Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-31423"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-31423"
  ]
}