btrfs: fix BUG_ON condition in btrfs_cancel_balance

{
  "id": "ebb7c5a3418bb638688ca8d66c37cc3a5af83781f1a733778027ef88417e9b24",
  "url": "https://osv.dev/vulnerability/CVE-2023-53339",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "btrfs: fix BUG_ON condition in btrfs_cancel_balance",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: btrfs: fix BUG_ON condition in btrfs_cancel_balance Pausing and canceling balance can race to interrupt balance lead to BUG_ON panic in btrfs_cancel_balance. The BUG_ON condition in btrfs_cancel_balance does not take this race scenario into account. However, the race condition has no other side effects. We can fix that. Reproducing it with panic trace like this: kernel BUG at fs/btrfs/volumes.c:4618! RIP: 0010:btrfs_cancel_balance+0x5cf/0x6a0 Call Trace: ? do_nanosleep+0x60/0x120 ? hrtimer_nanosleep+0xb7/0x1a0 ? sched_core_clone_cookie+0x70/0x70 btrfs_ioctl_balance_ctl+0x55/0x70 btrfs_ioctl+0xa46/0xd20 __x64_sys_ioctl+0x7d/0xa0 do_syscall_64+0x38/0x80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Race scenario as follows: > mutex_unlock(&fs_info->balance_mutex); > -------------------- > .......issue pause and cancel req in another thread > -------------------- > ret = __btrfs_balance(fs_info); > > mutex_lock(&fs_info->balance_mutex); > if (ret == -ECANCELED && atomic_read(&fs_info->balance_pause_req)) { > btrfs_info(fs_info, \"balance: paused\"); > btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE_PAUSED); > }",
    "evidence": "osv:CVE-2023-53339",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.47",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.4.12",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2023-53339",
      "aliases": [
        "CVE-2023-53339"
      ],
      "affected": [
        {
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "ddf7e8984c83aee9122552529f4e77291903f8d9"
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                {
                  "fixed": "ceb9ba8e30833a4823e2dc73f80ebcdf2498d01a"
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              "type": "GIT",
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                  "fixed": "29eefa6d0d07e185f7bfe9576f91e6dba98189c2"
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          "versions": [
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            "v6.1.45",
            "v6.1.44",
            "v6.1.43",
            "v6.1.42",
            "v6.4.11",
            "v6.4.10",
            "v6.4.9",
            "v6.4.8",
            "v6.4.7"
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          "database_specific": {
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          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.1.42"
                },
                {
                  "fixed": "6.1.47"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.4.7"
                },
                {
                  "fixed": "6.4.12"
                }
              ]
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53339.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:31.261099595Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/29eefa6d0d07e185f7bfe9576f91e6dba98189c2",
        "https://git.kernel.org/stable/c/ae81329f7de3aa6f34ecdfa5412e72161a30e9ce",
        "https://git.kernel.org/stable/c/ceb9ba8e30833a4823e2dc73f80ebcdf2498d01a",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53339.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-53339",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53339.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-53339",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 497919,
  "published_at": "2025-09-17T14:56:33.114+00:00"
}