{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  sched/fair: Fix overflow in update_tg_cfs_runnable()  A divide-by-zero crash is observed when running hackbench:     [14697.488452] CPU: 112 UID: 0 PID: 124791 Comm: hackbench Not tainted 7.1.0-rc2+    [14697.492627] RIP: 0010:propagate_entity_load_avg+0x35f/0x3e0    [14697.506799]  \u003cTASK\u003e    [14697.507411]  __dequeue_task+0x2b4/0xc70    [14697.508677]  dequeue_task_fair+0x36/0x370    [14697.509047]  dequeue_task+0x101/0x2f0    [14697.509426]  __schedule+0x1b1/0x1a00    [14697.510868]  anon_pipe_read+0x3da/0x450    [14697.511400]  vfs_read+0x361/0x390    [14697.512053]  __x64_sys_read+0x19/0x30  The divide-by-zero happens here:    if (scale_load_down(gcfs_rq-\u003eload.weight)) {            load_sum = div_u64(gcfs_rq-\u003eavg.load_sum,                               scale_load_down(gcfs_rq-\u003eload.weight));   }  gcfs_rq-\u003eload.weight is an insane large value and is truncated to the lower 32 bits by div_u64, which happen to be 0.  Using AI for investigation, the cause is a u32 overflow in update_tg_cfs_runnable(), and flat pickup became a victim when using tg_tasks():     u32 new_sum, divider;    ...    new_sum = se-\u003eavg.runnable_avg * divider; \u003c-- boom  The following sequence shows how this triggers the crash:     propagate_entity_load_avg()      update_tg_cfs_runnable()     # u32 overflow corrupts runnable_sum     __update_load_avg_cfs_rq()      ___update_load_avg()         # computes insane runnable_avg    update_tg_load_avg()           # propagates to tg-\u003erunnable_avg     update_cfs_group()      calc_concur_shares()        tg_tasks()                 # long-to-int truncation, negative nr      reweight_entity()            # corrupted se-\u003eload.weight        update_load_add()          # corrupted cfs_rq-\u003eload.weight     propagate_entity_load_avg()      update_tg_cfs_load()        div_u64()                  # divide-by-zero  Fix by widening new_sum from u32 to u64 (no need to force tg_tasks() to return unsigned long after this fix)",
  "id": "DEBIAN-CVE-2026-93182",
  "modified": "2026-09-18T04:47:37.324606674Z",
  "published": "2026-09-17T17:18:14.153Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-93182"
    }
  ],
  "upstream": [
    "CVE-2026-93182"
  ]
}