fkie_cve-2022-50379
Vulnerability from fkie_nvd
Published
2025-09-18 14:15
Modified
2025-12-11 18:19
Severity ?
4.7 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: btrfs: fix race between quota enable and quota rescan ioctl When enabling quotas, at btrfs_quota_enable(), after committing the transaction, we change fs_info->quota_root to point to the quota root we created and set BTRFS_FS_QUOTA_ENABLED at fs_info->flags. Then we try to start the qgroup rescan worker, first by initializing it with a call to qgroup_rescan_init() - however if that fails we end up freeing the quota root but we leave fs_info->quota_root still pointing to it, this can later result in a use-after-free somewhere else. We have previously set the flags BTRFS_FS_QUOTA_ENABLED and BTRFS_QGROUP_STATUS_FLAG_ON, so we can only fail with -EINPROGRESS at btrfs_quota_enable(), which is possible if someone already called the quota rescan ioctl, and therefore started the rescan worker. So fix this by ignoring an -EINPROGRESS and asserting we can't get any other error.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0efd9dfc00d677a1d0929319a6103cb2dfc41c22Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/26b7c0ac49a3eea15559c9d84863736a6d1164b4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/331cd9461412e103d07595a10289de90004ac890Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/47b5ffe86332af95f0f52be0a63d4da7c2b37b55Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4b996a3014ef014af8f97b60c35f5289210a4720Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6c22f86dd221eba0c7af645b1af73dcbc04ee27bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c97f6d528c3f1c83a6b792a8a7928c236c80b8fePatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *


To clipboard 

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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix race between quota enable and quota rescan ioctl\n\nWhen enabling quotas, at btrfs_quota_enable(), after committing the\ntransaction, we change fs_info-\u003equota_root to point to the quota root we\ncreated and set BTRFS_FS_QUOTA_ENABLED at fs_info-\u003eflags. Then we try\nto start the qgroup rescan worker, first by initializing it with a call\nto qgroup_rescan_init() - however if that fails we end up freeing the\nquota root but we leave fs_info-\u003equota_root still pointing to it, this\ncan later result in a use-after-free somewhere else.\n\nWe have previously set the flags BTRFS_FS_QUOTA_ENABLED and\nBTRFS_QGROUP_STATUS_FLAG_ON, so we can only fail with -EINPROGRESS at\nbtrfs_quota_enable(), which is possible if someone already called the\nquota rescan ioctl, and therefore started the rescan worker.\n\nSo fix this by ignoring an -EINPROGRESS and asserting we can\u0027t get any\nother error."
    }
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  "id": "CVE-2022-50379",
  "lastModified": "2025-12-11T18:19:19.170",
  "metrics": {
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          "attackVector": "LOCAL",
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          "baseScore": 4.7,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
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}


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