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        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
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        "summary": "Canonical URL",
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          "date": "2022-01-01T00:00:00Z",
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        "name": "Integer Overflow or Wraparound"
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          "category": "description",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix qgroup reserve overflow the qgroup limit\n\nWe use extent_changeset->bytes_changed in qgroup_reserve_data() to record\nhow many bytes we set for EXTENT_QGROUP_RESERVED state. Currently the\nbytes_changed is set as \"unsigned int\", and it will overflow if we try to\nfallocate a range larger than 4GiB. The result is we reserve less bytes\nand eventually break the qgroup limit.\n\nUnlike regular buffered/direct write, which we use one changeset for\neach ordered extent, which can never be larger than 256M.  For\nfallocate, we use one changeset for the whole range, thus it no longer\nrespects the 256M per extent limit, and caused the problem.\n\nThe following example test script reproduces the problem:\n\n  $ cat qgroup-overflow.sh\n  #!/bin/bash\n\n  DEV=/dev/sdj\n  MNT=/mnt/sdj\n\n  mkfs.btrfs -f $DEV\n  mount $DEV $MNT\n\n  # Set qgroup limit to 2GiB.\n  btrfs quota enable $MNT\n  btrfs qgroup limit 2G $MNT\n\n  # Try to fallocate a 3GiB file. This should fail.\n  echo\n  echo \"Try to fallocate a 3GiB file...\"\n  fallocate -l 3G $MNT/3G.file\n\n  # Try to fallocate a 5GiB file.\n  echo\n  echo \"Try to fallocate a 5GiB file...\"\n  fallocate -l 5G $MNT/5G.file\n\n  # See we break the qgroup limit.\n  echo\n  sync\n  btrfs qgroup show -r $MNT\n\n  umount $MNT\n\nWhen running the test:\n\n  $ ./qgroup-overflow.sh\n  (...)\n\n  Try to fallocate a 3GiB file...\n  fallocate: fallocate failed: Disk quota exceeded\n\n  Try to fallocate a 5GiB file...\n\n  qgroupid         rfer         excl     max_rfer\n  --------         ----         ----     --------\n  0/5           5.00GiB      5.00GiB      2.00GiB\n\nSince we have no control of how bytes_changed is used, it's better to\nset it to u64.",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2022-49075"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/0355387ea5b02d353c9415613fab908fac5c52a6",
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          "url": "https://git.kernel.org/stable/c/4b98799e181b4326a613108cf37acc1f55d21b45"
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          "url": "https://git.kernel.org/stable/c/6bfff81286d4491f02dad7814bae5c77c9ad2320"
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          "url": "https://git.kernel.org/stable/c/7941b74ed49b6db25efbef2256ebef843c11a010"
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          "summary": "https://git.kernel.org/stable/c/82ae73ac963cee877ce34f7c31b2b456b516e96c",
          "url": "https://git.kernel.org/stable/c/82ae73ac963cee877ce34f7c31b2b456b516e96c"
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        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/b642b52d0b50f4d398cb4293f64992d0eed2e2ce",
          "url": "https://git.kernel.org/stable/c/b642b52d0b50f4d398cb4293f64992d0eed2e2ce"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/f3d97b22a708bf9e3f3ac2ba232bcefd0b0c136b",
          "url": "https://git.kernel.org/stable/c/f3d97b22a708bf9e3f3ac2ba232bcefd0b0c136b"
        }
      ],
      "release_date": "2025-02-26T01:54:38Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-08-05T12:12:37.046125Z",
          "details": "CVE-2022-49075 is only reachable on Btrfs filesystems with quota groups explicitly enabled and through a local user issuing a single fallocate() call larger than 4 GiB; systems not using Btrfs or with qgroups disabled are unaffected. The flaw causes incorrect quota accounting that can allow space usage to exceed the configured limit, impacting availability only with no confidentiality, integrity, or privilege effects. Given its local-only vector, dependency on a non-default filesystem feature, and narrow trigger condition, it can be safely deprioritized in managed enterprise VM/server environments.",
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            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
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}