CVE-2022-49167 (GCVE-0-2022-49167)
Vulnerability from cvelistv5
Published
2025-02-26 01:55
Modified
2026-08-05 08:54
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: btrfs: do not double complete bio on errors during compressed reads I hit some weird panics while fixing up the error handling from btrfs_lookup_bio_sums(). Turns out the compression path will complete the bio we use if we set up any of the compression bios and then return an error, and then btrfs_submit_data_bio() will also call bio_endio() on the bio. Fix this by making btrfs_submit_compressed_read() responsible for calling bio_endio() on the bio if there are any errors. Currently it was only doing it if we created the compression bios, otherwise it was depending on btrfs_submit_data_bio() to do the right thing. This creates the above problem, so fix up btrfs_submit_compressed_read() to always call bio_endio() in case of an error, and then simply return from btrfs_submit_data_bio() if we had to call btrfs_submit_compressed_read().
References
Impacted products
Vendor Product Version
Linux Linux Version: 86ccbb4d2a2af4109430df518c995a4f7d14dfd2
Version: 86ccbb4d2a2af4109430df518c995a4f7d14dfd2
Version: 86ccbb4d2a2af4109430df518c995a4f7d14dfd2
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/compression.c",
            "fs/btrfs/inode.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "lessThan": "4a4ceb2b990771c374d85d496a1a45255dde48e3",
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              "version": "86ccbb4d2a2af4109430df518c995a4f7d14dfd2",
              "versionType": "git"
            },
            {
              "lessThan": "987b5df1d10355d377315a26e7fb6c72ded83c9f",
              "status": "affected",
              "version": "86ccbb4d2a2af4109430df518c995a4f7d14dfd2",
              "versionType": "git"
            },
            {
              "lessThan": "f9f15de85d74e7eef021af059ca53a15f041cdd8",
              "status": "affected",
              "version": "86ccbb4d2a2af4109430df518c995a4f7d14dfd2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/compression.c",
            "fs/btrfs/inode.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.16"
            },
            {
              "lessThan": "5.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.16.*",
              "status": "unaffected",
              "version": "5.16.19",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.17.*",
              "status": "unaffected",
              "version": "5.17.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.16.19",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.17.2",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "5.18",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: do not double complete bio on errors during compressed reads\n\nI hit some weird panics while fixing up the error handling from\nbtrfs_lookup_bio_sums().  Turns out the compression path will complete\nthe bio we use if we set up any of the compression bios and then return\nan error, and then btrfs_submit_data_bio() will also call bio_endio() on\nthe bio.\n\nFix this by making btrfs_submit_compressed_read() responsible for\ncalling bio_endio() on the bio if there are any errors.  Currently it\nwas only doing it if we created the compression bios, otherwise it was\ndepending on btrfs_submit_data_bio() to do the right thing.  This\ncreates the above problem, so fix up btrfs_submit_compressed_read() to\nalways call bio_endio() in case of an error, and then simply return from\nbtrfs_submit_data_bio() if we had to call\nbtrfs_submit_compressed_read()."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is in btrfs compressed buffered-read submission (read \u2192 extent_io \u2192 submit_one_bio \u2192 btrfs_submit_data_bio \u2192 btrfs_submit_compressed_read), reachable only via local VFS reads of compressed extents on a mounted btrfs filesystem, not via network protocol handlers.\nAC:L - An attacker who can read compressed files can drive the finish_cb error path (e.g., by inducing ENOMEM in btrfs_lookup_bio_sums/alloc_compressed_bio after pages are allocated); no victim-controlled race or rare non-default config is required.\nPR:L - An unprivileged local user can create compressed files (mount compress= or chattr +c) and read them on an already-mounted btrfs volume; no real root or init-namespace admin capability is required.\nUI:N - Exploitation needs no separate victim action once btrfs is mounted; the attacker triggers the path by reading their own compressed files (and optionally stressing memory).\nS:U - Impact stays within the local kernel/OS security authority (standard kernel memory corruption / DoS); there is no VM escape, IOMMU bypass, or other cross-boundary effect.\nC:H - Double bio_endio after end_bio_extent_readpage\u0027s bio_put is a use-after-free of the bio (bioset object), which per UAF guidance enables reclaim and arbitrary read primitives.\nI:H - The same bio UAF/double-free, plus re-entry into page unlock/extent-release paths on already-completed state, is memory corruption that can be leveraged for write primitives and control-flow hijacking.\nA:H - The author observed kernel panics from the double completion; UAF/double bio_put and double page unlock reliably cause oops/panic or equivalent denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:54:11.254Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4a4ceb2b990771c374d85d496a1a45255dde48e3"
        },
        {
          "url": "https://git.kernel.org/stable/c/987b5df1d10355d377315a26e7fb6c72ded83c9f"
        },
        {
          "url": "https://git.kernel.org/stable/c/f9f15de85d74e7eef021af059ca53a15f041cdd8"
        }
      ],
      "title": "btrfs: do not double complete bio on errors during compressed reads",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49167",
    "datePublished": "2025-02-26T01:55:26.030Z",
    "dateReserved": "2025-02-26T01:49:39.278Z",
    "dateUpdated": "2026-08-05T08:54:11.254Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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