CVE-2025-39999 (GCVE-0-2025-39999)
Vulnerability from cvelistv5
Published
2025-10-15 07:58
Modified
2025-10-15 07:58
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: blk-mq: fix blk_mq_tags double free while nr_requests grown In the case user trigger tags grow by queue sysfs attribute nr_requests, hctx->sched_tags will be freed directly and replaced with a new allocated tags, see blk_mq_tag_update_depth(). The problem is that hctx->sched_tags is from elevator->et->tags, while et->tags is still the freed tags, hence later elevator exit will try to free the tags again, causing kernel panic. Fix this problem by replacing et->tags with new allocated tags as well. Noted there are still some long term problems that will require some refactor to be fixed thoroughly[1]. [1] https://lore.kernel.org/all/20250815080216.410665-1-yukuai1@huaweicloud.com/
References
Impacted products
Vendor Product Version
Linux Linux Version: 58567d8e95c096ad234963df90a2ca518901f4b6
Version: f5a6604f7a4405450e4a1f54e5430f47290c500f
Version: f5a6604f7a4405450e4a1f54e5430f47290c500f
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{
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "block/blk-mq-tag.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "version": "0",
              "versionType": "semver"
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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\nblk-mq: fix blk_mq_tags double free while nr_requests grown\n\nIn the case user trigger tags grow by queue sysfs attribute nr_requests,\nhctx-\u003esched_tags will be freed directly and replaced with a new\nallocated tags, see blk_mq_tag_update_depth().\n\nThe problem is that hctx-\u003esched_tags is from elevator-\u003eet-\u003etags, while\net-\u003etags is still the freed tags, hence later elevator exit will try to\nfree the tags again, causing kernel panic.\n\nFix this problem by replacing et-\u003etags with new allocated tags as well.\n\nNoted there are still some long term problems that will require some\nrefactor to be fixed thoroughly[1].\n\n[1] https://lore.kernel.org/all/20250815080216.410665-1-yukuai1@huaweicloud.com/"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-10-15T07:58:23.038Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/8faee580d63bc2a54a59dcdb7f9ce4de29384fec"
        },
        {
          "url": "https://git.kernel.org/stable/c/392b1d64911f4de8887fe8b68299fa8bd6e5b923"
        },
        {
          "url": "https://git.kernel.org/stable/c/ba28afbd9eff2a6370f23ef4e6a036ab0cfda409"
        }
      ],
      "title": "blk-mq: fix blk_mq_tags double free while nr_requests grown",
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39999",
    "datePublished": "2025-10-15T07:58:23.038Z",
    "dateReserved": "2025-04-16T07:20:57.151Z",
    "dateUpdated": "2025-10-15T07:58:23.038Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-39999\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-15T08:15:38.210\",\"lastModified\":\"2025-10-16T15:28:59.610\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nblk-mq: fix blk_mq_tags double free while nr_requests grown\\n\\nIn the case user trigger tags grow by queue sysfs attribute nr_requests,\\nhctx-\u003esched_tags will be freed directly and replaced with a new\\nallocated tags, see blk_mq_tag_update_depth().\\n\\nThe problem is that hctx-\u003esched_tags is from elevator-\u003eet-\u003etags, while\\net-\u003etags is still the freed tags, hence later elevator exit will try to\\nfree the tags again, causing kernel panic.\\n\\nFix this problem by replacing et-\u003etags with new allocated tags as well.\\n\\nNoted there are still some long term problems that will require some\\nrefactor to be fixed thoroughly[1].\\n\\n[1] https://lore.kernel.org/all/20250815080216.410665-1-yukuai1@huaweicloud.com/\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/392b1d64911f4de8887fe8b68299fa8bd6e5b923\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8faee580d63bc2a54a59dcdb7f9ce4de29384fec\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ba28afbd9eff2a6370f23ef4e6a036ab0cfda409\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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