CVE-2026-23012 (GCVE-0-2026-23012)
Vulnerability from cvelistv5
Published
2026-01-25 14:36
Modified
2026-05-11 21:58
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/damon/core: remove call_control in inactive contexts If damon_call() is executed against a DAMON context that is not running, the function returns error while keeping the damon_call_control object linked to the context's call_controls list. Let's suppose the object is deallocated after the damon_call(), and yet another damon_call() is executed against the same context. The function tries to add the new damon_call_control object to the call_controls list, which still has the pointer to the previous damon_call_control object, which is deallocated. As a result, use-after-free happens. This can actually be triggered using the DAMON sysfs interface. It is not easily exploitable since it requires the sysfs write permission and making a definitely weird file writes, though. Please refer to the report for more details about the issue reproduction steps. Fix the issue by making two changes. Firstly, move the final kdamond_call() for cancelling all existing damon_call() requests from terminating DAMON context to be done before the ctx->kdamond reset. This makes any code that sees NULL ctx->kdamond can safely assume the context may not access damon_call() requests anymore. Secondly, let damon_call() to cleanup the damon_call_control objects that were added to the already-terminated DAMON context, before returning the error.
References
Impacted products
Vendor Product Version
Linux Linux Version: 004ded6bee11b8ed463cdc54b89a4390f4b64f6d
Version: 004ded6bee11b8ed463cdc54b89a4390f4b64f6d
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/damon/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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          "versions": [
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              "version": "0",
              "versionType": "semver"
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.17",
                  "vulnerable": true
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                {
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                  "versionEndExcluding": "6.19",
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                  "vulnerable": true
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/core: remove call_control in inactive contexts\n\nIf damon_call() is executed against a DAMON context that is not running,\nthe function returns error while keeping the damon_call_control object\nlinked to the context\u0027s call_controls list.  Let\u0027s suppose the object is\ndeallocated after the damon_call(), and yet another damon_call() is\nexecuted against the same context.  The function tries to add the new\ndamon_call_control object to the call_controls list, which still has the\npointer to the previous damon_call_control object, which is deallocated. \nAs a result, use-after-free happens.\n\nThis can actually be triggered using the DAMON sysfs interface.  It is not\neasily exploitable since it requires the sysfs write permission and making\na definitely weird file writes, though.  Please refer to the report for\nmore details about the issue reproduction steps.\n\nFix the issue by making two changes.  Firstly, move the final\nkdamond_call() for cancelling all existing damon_call() requests from\nterminating DAMON context to be done before the ctx-\u003ekdamond reset.  This\nmakes any code that sees NULL ctx-\u003ekdamond can safely assume the context\nmay not access damon_call() requests anymore.  Secondly, let damon_call()\nto cleanup the damon_call_control objects that were added to the\nalready-terminated DAMON context, before returning the error."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:58:17.877Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/23b061f421eef03647b512f3df48861706c87db3"
        },
        {
          "url": "https://git.kernel.org/stable/c/f9132fbc2e83baf2c45a77043672a63a675c9394"
        }
      ],
      "title": "mm/damon/core: remove call_control in inactive contexts",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23012",
    "datePublished": "2026-01-25T14:36:25.187Z",
    "dateReserved": "2026-01-13T15:37:45.940Z",
    "dateUpdated": "2026-05-11T21:58:17.877Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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