{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "95246d1ec80b8d19d882cd8eb7ad094e63b41bb8"
            },
            {
              "fixed": "39d707097a0820c6e87eff4195f0940e8ff1147e"
            },
            {
              "fixed": "69fafae4eb2c9fc9bcff1bcbfcccf5d197434d75"
            },
            {
              "fixed": "7cc237e3bc1733928313d2462b413ae441b0eef3"
            },
            {
              "fixed": "18fdd0978ec3dda0ff6865cd273e47e022180710"
            },
            {
              "fixed": "f94e62d21faad5e244d0874598a4d0ebbc0ea405"
            },
            {
              "fixed": "4f166adb5cb0525d9e32d45729fd8f28c80acbee"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.17.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.52"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93182.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/fair: Fix overflow in update_tg_cfs_runnable()\n\nA divide-by-zero crash is observed when running hackbench:\n\n   [14697.488452] CPU: 112 UID: 0 PID: 124791 Comm: hackbench Not tainted 7.1.0-rc2+\n   [14697.492627] RIP: 0010:propagate_entity_load_avg+0x35f/0x3e0\n   [14697.506799]  \u003cTASK\u003e\n   [14697.507411]  __dequeue_task+0x2b4/0xc70\n   [14697.508677]  dequeue_task_fair+0x36/0x370\n   [14697.509047]  dequeue_task+0x101/0x2f0\n   [14697.509426]  __schedule+0x1b1/0x1a00\n   [14697.510868]  anon_pipe_read+0x3da/0x450\n   [14697.511400]  vfs_read+0x361/0x390\n   [14697.512053]  __x64_sys_read+0x19/0x30\n\nThe divide-by-zero happens here:\n\n  if (scale_load_down(gcfs_rq-\u003eload.weight)) {\n           load_sum = div_u64(gcfs_rq-\u003eavg.load_sum,\n                              scale_load_down(gcfs_rq-\u003eload.weight));\n  }\n\ngcfs_rq-\u003eload.weight is an insane large value and is truncated\nto the lower 32 bits by div_u64, which happen to be 0.\n\nUsing AI for investigation, the cause is a u32 overflow in\nupdate_tg_cfs_runnable(), and flat pickup became a victim when using\ntg_tasks():\n\n   u32 new_sum, divider;\n   ...\n   new_sum = se-\u003eavg.runnable_avg * divider; \u003c-- boom\n\nThe following sequence shows how this triggers the crash:\n\n   propagate_entity_load_avg()\n     update_tg_cfs_runnable()     # u32 overflow corrupts runnable_sum\n\n   __update_load_avg_cfs_rq()\n     ___update_load_avg()         # computes insane runnable_avg\n   update_tg_load_avg()           # propagates to tg-\u003erunnable_avg\n\n   update_cfs_group()\n     calc_concur_shares()\n       tg_tasks()                 # long-to-int truncation, negative nr\n     reweight_entity()            # corrupted se-\u003eload.weight\n       update_load_add()          # corrupted cfs_rq-\u003eload.weight\n\n   propagate_entity_load_avg()\n     update_tg_cfs_load()\n       div_u64()                  # divide-by-zero\n\nFix by widening new_sum from u32 to u64 (no need to force tg_tasks()\nto return unsigned long after this fix)",
  "id": "CVE-2026-93182",
  "modified": "2026-09-19T03:30:39.815224207Z",
  "published": "2026-09-17T16:12:09.381Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/18fdd0978ec3dda0ff6865cd273e47e022180710"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/39d707097a0820c6e87eff4195f0940e8ff1147e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4f166adb5cb0525d9e32d45729fd8f28c80acbee"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/69fafae4eb2c9fc9bcff1bcbfcccf5d197434d75"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7cc237e3bc1733928313d2462b413ae441b0eef3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f94e62d21faad5e244d0874598a4d0ebbc0ea405"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93182.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93182"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "sched/fair: Fix overflow in update_tg_cfs_runnable()"
}