CVE-2022-50293 (GCVE-0-2022-50293)
Vulnerability from cvelistv5
Published
2025-09-15 14:45
Modified
2025-09-15 14:45
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: btrfs: do not BUG_ON() on ENOMEM when dropping extent items for a range If we get -ENOMEM while dropping file extent items in a given range, at btrfs_drop_extents(), due to failure to allocate memory when attempting to increment the reference count for an extent or drop the reference count, we handle it with a BUG_ON(). This is excessive, instead we can simply abort the transaction and return the error to the caller. In fact most callers of btrfs_drop_extents(), directly or indirectly, already abort the transaction if btrfs_drop_extents() returns any error. Also, we already have error paths at btrfs_drop_extents() that may return -ENOMEM and in those cases we abort the transaction, like for example anything that changes the b+tree may return -ENOMEM due to a failure to allocate a new extent buffer when COWing an existing extent buffer, such as a call to btrfs_duplicate_item() for example. So replace the BUG_ON() calls with proper logic to abort the transaction and return the error.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/162d053e15fe985f754ef495a96eb3db970c43ed
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1baf3370e2dc5e6bd1368348736189457dab2a27
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/50f993da945074b2a069da099a0331b23a0c89a0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7fbcb635c8fc927d139f3302babcf1b42c09265c
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/file.c"
          ],
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          "vendor": "Linux",
          "versions": [
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          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.86",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "vulnerable": true
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                  "versionEndExcluding": "6.0.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.2",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: do not BUG_ON() on ENOMEM when dropping extent items for a range\n\nIf we get -ENOMEM while dropping file extent items in a given range, at\nbtrfs_drop_extents(), due to failure to allocate memory when attempting to\nincrement the reference count for an extent or drop the reference count,\nwe handle it with a BUG_ON(). This is excessive, instead we can simply\nabort the transaction and return the error to the caller. In fact most\ncallers of btrfs_drop_extents(), directly or indirectly, already abort\nthe transaction if btrfs_drop_extents() returns any error.\n\nAlso, we already have error paths at btrfs_drop_extents() that may return\n-ENOMEM and in those cases we abort the transaction, like for example\nanything that changes the b+tree may return -ENOMEM due to a failure to\nallocate a new extent buffer when COWing an existing extent buffer, such\nas a call to btrfs_duplicate_item() for example.\n\nSo replace the BUG_ON() calls with proper logic to abort the transaction\nand return the error."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-15T14:45:49.338Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/50f993da945074b2a069da099a0331b23a0c89a0"
        },
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          "url": "https://git.kernel.org/stable/c/7fbcb635c8fc927d139f3302babcf1b42c09265c"
        },
        {
          "url": "https://git.kernel.org/stable/c/1baf3370e2dc5e6bd1368348736189457dab2a27"
        },
        {
          "url": "https://git.kernel.org/stable/c/162d053e15fe985f754ef495a96eb3db970c43ed"
        }
      ],
      "title": "btrfs: do not BUG_ON() on ENOMEM when dropping extent items for a range",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50293",
    "datePublished": "2025-09-15T14:45:49.338Z",
    "dateReserved": "2025-09-15T14:18:36.811Z",
    "dateUpdated": "2025-09-15T14:45:49.338Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50293\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-15T15:15:40.640\",\"lastModified\":\"2025-09-15T15:22:27.090\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbtrfs: do not BUG_ON() on ENOMEM when dropping extent items for a range\\n\\nIf we get -ENOMEM while dropping file extent items in a given range, at\\nbtrfs_drop_extents(), due to failure to allocate memory when attempting to\\nincrement the reference count for an extent or drop the reference count,\\nwe handle it with a BUG_ON(). This is excessive, instead we can simply\\nabort the transaction and return the error to the caller. In fact most\\ncallers of btrfs_drop_extents(), directly or indirectly, already abort\\nthe transaction if btrfs_drop_extents() returns any error.\\n\\nAlso, we already have error paths at btrfs_drop_extents() that may return\\n-ENOMEM and in those cases we abort the transaction, like for example\\nanything that changes the b+tree may return -ENOMEM due to a failure to\\nallocate a new extent buffer when COWing an existing extent buffer, such\\nas a call to btrfs_duplicate_item() for example.\\n\\nSo replace the BUG_ON() calls with proper logic to abort the transaction\\nand return the error.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/162d053e15fe985f754ef495a96eb3db970c43ed\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1baf3370e2dc5e6bd1368348736189457dab2a27\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/50f993da945074b2a069da099a0331b23a0c89a0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7fbcb635c8fc927d139f3302babcf1b42c09265c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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