{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "3301f1861d34f53911a30a8f5f41b9141bd8ed39"
            },
            {
              "fixed": "9c495f9d3781cd692bd199531cabd4627155e8cd"
            },
            {
              "fixed": "1b247cd0654a3a306996fa80741d79296c683a56"
            },
            {
              "fixed": "26f775a054c3cda86ad465a64141894a90a9e145"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.15.0"
            },
            {
              "fixed": "6.18.21"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31445.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/core: avoid use of half-online-committed context\n\nOne major usage of damon_call() is online DAMON parameters update.  It is\ndone by calling damon_commit_ctx() inside the damon_call() callback\nfunction.  damon_commit_ctx() can fail for two reasons: 1) invalid\nparameters and 2) internal memory allocation failures.  In case of\nfailures, the damon_ctx that attempted to be updated (commit destination)\ncan be partially updated (or, corrupted from a perspective), and therefore\nshouldn't be used anymore.  The function only ensures the damon_ctx object\ncan safely deallocated using damon_destroy_ctx().\n\nThe API callers are, however, calling damon_commit_ctx() only after\nasserting the parameters are valid, to avoid damon_commit_ctx() fails due\nto invalid input parameters.  But it can still theoretically fail if the\ninternal memory allocation fails.  In the case, DAMON may run with the\npartially updated damon_ctx.  This can result in unexpected behaviors\nincluding even NULL pointer dereference in case of damos_commit_dests()\nfailure [1].  Such allocation failure is arguably too small to fail, so\nthe real world impact would be rare.  But, given the bad consequence, this\nneeds to be fixed.\n\nAvoid such partially-committed (maybe-corrupted) damon_ctx use by saving\nthe damon_commit_ctx() failure on the damon_ctx object.  For this,\nintroduce damon_ctx-\u003emaybe_corrupted field.  damon_commit_ctx() sets it\nwhen it is failed.  kdamond_call() checks if the field is set after each\ndamon_call_control-\u003efn() is executed.  If it is set, ignore remaining\ncallback requests and return.  All kdamond_call() callers including\nkdamond_fn() also check the maybe_corrupted field right after\nkdamond_call() invocations.  If the field is set, break the kdamond_fn()\nmain loop so that DAMON sill doesn't use the context that might be\ncorrupted.\n\n[sj@kernel.org: let kdamond_call() with cancel regardless of maybe_corrupted]",
  "id": "CVE-2026-31445",
  "modified": "2026-07-15T01:49:09.473631386Z",
  "published": "2026-04-22T13:53:42.090Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1b247cd0654a3a306996fa80741d79296c683a56"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/26f775a054c3cda86ad465a64141894a90a9e145"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9c495f9d3781cd692bd199531cabd4627155e8cd"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31445.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31445"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "summary": "mm/damon/core: avoid use of half-online-committed context"
}