{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.1.9-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  samples/damon/mtier: error out for zero quota goal target values  Patch series \"mm/damon: avoid division by zero from damos_quota_score()\".  DAMON_SAMPLE_MTIER and DAMON_LRU_SORT allow the user to trigger division by zero in damos_quota_score().  Avoid it by adding parameters validation checks.   This patch (of 2):  damos_quota_score() can trigger division by zero if the target_value is zero.  DAMON_SAMPLE_MTIER lets users set the target_value via node0_mem_{used,free}_bp parameters.  It doesn't guard zero value case, though.  As a result, users can trigger division by zero.  Fix the issue by returning an error when the user tries to start DAMON with zero node0_mem_{used,free}_bp parameter values.  DAMON_SAMPLE_MTIER is just a sample module, but the consequence is quite bad.  Also the zero node0_mem_free_bp parameter might look like a reasonable setup to some users.  Hence, the issue might really happen in the real world.  One reliable way to reproduce the issue is like below:      # cd /sys/module/damon_sample_mtier/parameters     # echo 4096 \u003e node0_start_addr     # echo 8192 \u003e node0_end_addr     # echo 8192 \u003e node1_start_addr     # echo 81920 \u003e node1_end_addr     # echo 0 \u003e node0_mem_free_bp     # echo Y \u003e enabled     # dmesg -w     [...]     [18792.235916] Oops: divide error: 0000 [#1] SMP NOPTI     [...]     [18792.242787] RIP: 0010:damos_quota_score+0x6f/0x480     [...]  This issue was discovered [1] by Sashiko.",
  "id": "DEBIAN-CVE-2026-74643",
  "modified": "2026-09-14T16:47:41.078838432Z",
  "published": "2026-08-22T16:16:37.617Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-74643"
    }
  ],
  "upstream": [
    "CVE-2026-74643"
  ]
}