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

{
  "id": "b14ae8890d48ef135e56b2bb55485a171ca70213a546a3b349f040afe51f6b60",
  "url": "https://osv.dev/vulnerability/CVE-2024-46840",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "btrfs: clean up our handling of refs == 0 in snapshot delete",
    "summary": "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.",
    "evidence": "osv:CVE-2024-46840",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.19.322",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.4.284",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.10.226",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.167",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.110",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.51",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.10.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2024-46840",
      "aliases": [
        "CVE-2024-46840"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "2c47e605a91dde6b0514f689645e7ab336c8592a"
                },
                {
                  "fixed": "c847b28a799733b04574060ab9d00f215970627d"
                },
                {
                  "fixed": "71291aa7246645ef622621934d2067400380645e"
                },
                {
                  "fixed": "c60676b81fab456b672796830f6d8057058f029c"
                },
                {
                  "fixed": "728d4d045b628e006b48a448f3326a7194c88d32"
                },
                {
                  "fixed": "9cc887ac24b7a0598f4042ae9af6b9a33072f75b"
                },
                {
                  "fixed": "7d1df13bf078ffebfedd361d714ff6cee1ff01b9"
                },
                {
                  "fixed": "03804641ec2d0da4fa088ad21c88e703d151ce16"
                },
                {
                  "fixed": "b8ccef048354074a548f108e51d0557d6adfd3a3"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-46840.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "2.6.31"
                },
                {
                  "fixed": "4.19.322"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.20.0"
                },
                {
                  "fixed": "5.4.284"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.5.0"
                },
                {
                  "fixed": "5.10.226"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.167"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.110"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.51"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.10.10"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-46840.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:53.309803239Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/03804641ec2d0da4fa088ad21c88e703d151ce16",
        "https://git.kernel.org/stable/c/71291aa7246645ef622621934d2067400380645e",
        "https://git.kernel.org/stable/c/728d4d045b628e006b48a448f3326a7194c88d32",
        "https://git.kernel.org/stable/c/7d1df13bf078ffebfedd361d714ff6cee1ff01b9",
        "https://git.kernel.org/stable/c/9cc887ac24b7a0598f4042ae9af6b9a33072f75b",
        "https://git.kernel.org/stable/c/b8ccef048354074a548f108e51d0557d6adfd3a3",
        "https://git.kernel.org/stable/c/c60676b81fab456b672796830f6d8057058f029c",
        "https://git.kernel.org/stable/c/c847b28a799733b04574060ab9d00f215970627d",
        "https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html",
        "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/46xxx/CVE-2024-46840.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-46840",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/46xxx/CVE-2024-46840.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-46840",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 522018,
  "published_at": "2024-09-27T12:39:34.998+00:00"
}