{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "0e1c773b501f33437d87b72c7d26080361e224b1"
            },
            {
              "fixed": "b09958e235f2b9cd3898b85a8529172afa80d212"
            },
            {
              "fixed": "bcad74078708f2330a45b55358ebc38f8f4b1127"
            },
            {
              "fixed": "40250b2dded0604a112be605f3828700d80ad7c2"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.16.0"
            },
            {
              "fixed": "6.18.27"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46020.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/core: validate damos_quota_goal-\u003enid for node_mem_{used,free}_bp\n\nPatch series \"mm/damon/core: validate damos_quota_goal-\u003enid\".\n\nnode_mem[cg]_{used,free}_bp DAMOS quota goals receive the node id.  The\nnode id is used for si_meminfo_node() and NODE_DATA() without proper\nvalidation.  As a result, privileged users can trigger an out of bounds\nmemory access using DAMON_SYSFS.  Fix the issues.\n\nThe issue was originally reported [1] with a fix by another author.  The\noriginal author announced [2] that they will stop working including the\nfix that was still in the review stage.  Hence I'm restarting this.\n\n\nThis patch (of 2):\n\nUsers can set damos_quota_goal-\u003enid with arbitrary value for\nnode_mem_{used,free}_bp.  But DAMON core is using those for\nsi_meminfo_node() without the validation of the value.  This can result in\nout of bounds memory access.  The issue can actually triggered using DAMON\nuser-space tool (damo), like below.\n\n    $ sudo ./damo start --damos_action stat \\\n    \t--damos_quota_goal node_mem_used_bp 50% -1 \\\n    \t--damos_quota_interval 1s\n    $ sudo dmesg\n    [...]\n    [   65.565986] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000098\n\nFix this issue by adding the validation of the given node.  If an invalid\nnode id is given, it returns 0% for used memory ratio, and 100% for free\nmemory ratio.",
  "id": "CVE-2026-46020",
  "modified": "2026-07-15T01:49:20.355752963Z",
  "published": "2026-05-27T12:56:21.920Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/40250b2dded0604a112be605f3828700d80ad7c2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b09958e235f2b9cd3898b85a8529172afa80d212"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bcad74078708f2330a45b55358ebc38f8f4b1127"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46020.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46020"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "summary": "mm/damon/core: validate damos_quota_goal-\u003enid for node_mem_{used,free}_bp"
}