{
  "cveId": "CVE-2026-74643",
  "url": "https://patchblox.com/security/cve/CVE-2026-74643",
  "summary": "CVE-2026-74643 is fixed in linux on 1 platform by DEBIAN-CVE-2026-74643 (version 7.1.9-1), released September 4, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  samples/damon/mtier: error out for zero quota go...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  samples/damon/mtier: error out for zero quota goal target values  Patch series \u0022mm/damon: avoid division by zero from damos_quota_score()\u0022.  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\u0027t 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\u002B0x6f/0x480     [...]  This issue was discovered [1] by Sashiko.",
  "published": "2026-08-22T16:16:37Z",
  "severity": "",
  "epss": 0.00166,
  "epssPercentile": 0.05882,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.1.9-1",
      "fix": "DEBIAN-CVE-2026-74643",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-74643",
      "released": "2026-09-04T01:46:23Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}