GHSA-44XQ-WGCC-3JWH

Vulnerability from github – Published: 2024-09-27 15:30 – Updated: 2025-11-04 00:31
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

btrfs: clean up our handling of refs == 0 in snapshot delete

In reada we BUG_ON(refs == 0), which could be unkind since we aren't holding a lock on the extent leaf and thus could get a transient incorrect answer. In walk_down_proc we also BUG_ON(refs == 0), which could happen if we have extent tree corruption. Change that to return -EUCLEAN. In do_walk_down() we catch this case and handle it correctly, however we return -EIO, which -EUCLEAN is a more appropriate error code. Finally in walk_up_proc we have the same BUG_ON(refs == 0), so convert that to proper error handling. Also adjust the error message so we can actually do something with the information.

Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2024-46840"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-09-27T13:15:16Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: clean up our handling of refs == 0 in snapshot delete\n\nIn reada we BUG_ON(refs == 0), which could be unkind since we aren\u0027t\nholding a lock on the extent leaf and thus could get a transient\nincorrect answer.  In walk_down_proc we also BUG_ON(refs == 0), which\ncould happen if we have extent tree corruption.  Change that to return\n-EUCLEAN.  In do_walk_down() we catch this case and handle it correctly,\nhowever we return -EIO, which -EUCLEAN is a more appropriate error code.\nFinally in walk_up_proc we have the same BUG_ON(refs == 0), so convert\nthat to proper error handling.  Also adjust the error message so we can\nactually do something with the information.",
  "id": "GHSA-44xq-wgcc-3jwh",
  "modified": "2025-11-04T00:31:31Z",
  "published": "2024-09-27T15:30:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-46840"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/03804641ec2d0da4fa088ad21c88e703d151ce16"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/71291aa7246645ef622621934d2067400380645e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/728d4d045b628e006b48a448f3326a7194c88d32"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7d1df13bf078ffebfedd361d714ff6cee1ff01b9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9cc887ac24b7a0598f4042ae9af6b9a33072f75b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b8ccef048354074a548f108e51d0557d6adfd3a3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c60676b81fab456b672796830f6d8057058f029c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c847b28a799733b04574060ab9d00f215970627d"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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