GHSA-MGJX-CG3Q-7VJW

Vulnerability from github – Published: 2026-04-13 15:31 – Updated: 2026-04-18 09:30
VLAI?
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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-31423"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-13T14:16:12Z",
    "severity": null
  },
  "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": "GHSA-mgjx-cg3q-7vjw",
  "modified": "2026-04-18T09:30:20Z",
  "published": "2026-04-13T15:31:42Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31423"
    },
    {
      "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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