CVE-2025-22126 (GCVE-0-2025-22126)
Vulnerability from cvelistv5
Published
2025-04-16 14:13
Modified
2025-04-25 10:06
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: md: fix mddev uaf while iterating all_mddevs list While iterating all_mddevs list from md_notify_reboot() and md_exit(), list_for_each_entry_safe is used, and this can race with deletint the next mddev, causing UAF: t1: spin_lock //list_for_each_entry_safe(mddev, n, ...) mddev_get(mddev1) // assume mddev2 is the next entry spin_unlock t2: //remove mddev2 ... mddev_free spin_lock list_del spin_unlock kfree(mddev2) mddev_put(mddev1) spin_lock //continue dereference mddev2->all_mddevs The old helper for_each_mddev() actually grab the reference of mddev2 while holding the lock, to prevent from being freed. This problem can be fixed the same way, however, the code will be complex. Hence switch to use list_for_each_entry, in this case mddev_put() can free the mddev1 and it's not safe as well. Refer to md_seq_show(), also factor out a helper mddev_put_locked() to fix this problem.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5462544ccbad3fc938a71b01fa5bd3a0dc2b750a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8542870237c3a48ff049b6c5df5f50c8728284fa
Impacted products
Vendor Product Version
Linux Linux Version: f26514342255855f4ca3c0a92cb1cdea01c33004
Version: f26514342255855f4ca3c0a92cb1cdea01c33004
Version: f26514342255855f4ca3c0a92cb1cdea01c33004
Version: f26514342255855f4ca3c0a92cb1cdea01c33004
Version: f26514342255855f4ca3c0a92cb1cdea01c33004
 Create a notification for this product.
   Linux Linux Version: 6.0
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/md/md.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ca9f84de76723b358dfc0606668efdca54afc2e5",
              "status": "affected",
              "version": "f26514342255855f4ca3c0a92cb1cdea01c33004",
              "versionType": "git"
            },
            {
              "lessThan": "d69a23d8e925f8052d657652a6875ec2712c7e33",
              "status": "affected",
              "version": "f26514342255855f4ca3c0a92cb1cdea01c33004",
              "versionType": "git"
            },
            {
              "lessThan": "e2a9f73ee408a460f4c9dfe03b4741d6b11652b8",
              "status": "affected",
              "version": "f26514342255855f4ca3c0a92cb1cdea01c33004",
              "versionType": "git"
            },
            {
              "lessThan": "5462544ccbad3fc938a71b01fa5bd3a0dc2b750a",
              "status": "affected",
              "version": "f26514342255855f4ca3c0a92cb1cdea01c33004",
              "versionType": "git"
            },
            {
              "lessThan": "8542870237c3a48ff049b6c5df5f50c8728284fa",
              "status": "affected",
              "version": "f26514342255855f4ca3c0a92cb1cdea01c33004",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/md/md.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.0"
            },
            {
              "lessThan": "6.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.135",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.88",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.25",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.14.*",
              "status": "unaffected",
              "version": "6.14.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.15-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd: fix mddev uaf while iterating all_mddevs list\n\nWhile iterating all_mddevs list from md_notify_reboot() and md_exit(),\nlist_for_each_entry_safe is used, and this can race with deletint the\nnext mddev, causing UAF:\n\nt1:\nspin_lock\n//list_for_each_entry_safe(mddev, n, ...)\n mddev_get(mddev1)\n // assume mddev2 is the next entry\n spin_unlock\n            t2:\n            //remove mddev2\n            ...\n            mddev_free\n            spin_lock\n            list_del\n            spin_unlock\n            kfree(mddev2)\n mddev_put(mddev1)\n spin_lock\n //continue dereference mddev2-\u003eall_mddevs\n\nThe old helper for_each_mddev() actually grab the reference of mddev2\nwhile holding the lock, to prevent from being freed. This problem can be\nfixed the same way, however, the code will be complex.\n\nHence switch to use list_for_each_entry, in this case mddev_put() can free\nthe mddev1 and it\u0027s not safe as well. Refer to md_seq_show(), also factor\nout a helper mddev_put_locked() to fix this problem."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-04-25T10:06:48.152Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ca9f84de76723b358dfc0606668efdca54afc2e5"
        },
        {
          "url": "https://git.kernel.org/stable/c/d69a23d8e925f8052d657652a6875ec2712c7e33"
        },
        {
          "url": "https://git.kernel.org/stable/c/e2a9f73ee408a460f4c9dfe03b4741d6b11652b8"
        },
        {
          "url": "https://git.kernel.org/stable/c/5462544ccbad3fc938a71b01fa5bd3a0dc2b750a"
        },
        {
          "url": "https://git.kernel.org/stable/c/8542870237c3a48ff049b6c5df5f50c8728284fa"
        }
      ],
      "title": "md: fix mddev uaf while iterating all_mddevs list",
      "x_generator": {
        "engine": "bippy-1.1.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-22126",
    "datePublished": "2025-04-16T14:13:09.399Z",
    "dateReserved": "2024-12-29T08:45:45.823Z",
    "dateUpdated": "2025-04-25T10:06:48.152Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-22126\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-04-16T15:16:06.727\",\"lastModified\":\"2025-04-17T20:22:16.240\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmd: fix mddev uaf while iterating all_mddevs list\\n\\nWhile iterating all_mddevs list from md_notify_reboot() and md_exit(),\\nlist_for_each_entry_safe is used, and this can race with deletint the\\nnext mddev, causing UAF:\\n\\nt1:\\nspin_lock\\n//list_for_each_entry_safe(mddev, n, ...)\\n mddev_get(mddev1)\\n // assume mddev2 is the next entry\\n spin_unlock\\n            t2:\\n            //remove mddev2\\n            ...\\n            mddev_free\\n            spin_lock\\n            list_del\\n            spin_unlock\\n            kfree(mddev2)\\n mddev_put(mddev1)\\n spin_lock\\n //continue dereference mddev2-\u003eall_mddevs\\n\\nThe old helper for_each_mddev() actually grab the reference of mddev2\\nwhile holding the lock, to prevent from being freed. This problem can be\\nfixed the same way, however, the code will be complex.\\n\\nHence switch to use list_for_each_entry, in this case mddev_put() can free\\nthe mddev1 and it\u0027s not safe as well. Refer to md_seq_show(), also factor\\nout a helper mddev_put_locked() to fix this problem.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/5462544ccbad3fc938a71b01fa5bd3a0dc2b750a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8542870237c3a48ff049b6c5df5f50c8728284fa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.