ext4: fix BUG_ON() when directory entry has invalid rec_len

{
  "id": "e8299bd25dfc134638bc67d56830baeb7c6581828c678a4e99974c216b5c9628",
  "url": "https://osv.dev/vulnerability/CVE-2022-49879",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ext4: fix BUG_ON() when directory entry has invalid rec_len",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ext4: fix BUG_ON() when directory entry has invalid rec_len The rec_len field in the directory entry has to be a multiple of 4. A corrupted filesystem image can be used to hit a BUG() in ext4_rec_len_to_disk(), called from make_indexed_dir(). ------------[ cut here ]------------ kernel BUG at fs/ext4/ext4.h:2413! ... RIP: 0010:make_indexed_dir+0x53f/0x5f0 ... Call Trace: ? add_dirent_to_buf+0x1b2/0x200 ext4_add_entry+0x36e/0x480 ext4_add_nondir+0x2b/0xc0 ext4_create+0x163/0x200 path_openat+0x635/0xe90 do_filp_open+0xb4/0x160 ? __create_object.isra.0+0x1de/0x3b0 ? _raw_spin_unlock+0x12/0x30 do_sys_openat2+0x91/0x150 __x64_sys_open+0x6c/0xa0 do_syscall_64+0x3c/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 The fix simply adds a call to ext4_check_dir_entry() to validate the directory entry, returning -EFSCORRUPTED if the entry is invalid.",
    "evidence": "osv:CVE-2022-49879",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.4.224",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.10.154",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.78",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.0.8",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2022-49879",
      "aliases": [
        "CVE-2022-49879"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "3d0518f4758eca4339e75e5b9dbb7e06a5ce08b4"
                },
                {
                  "fixed": "2fa24d0274fbf913b56ee31f15bc01168669d909"
                },
                {
                  "fixed": "156451a67b93986fb07c274ef6995ff40766c5ad"
                },
                {
                  "fixed": "999cff2b6ce3b45c08abf793bf55534777421327"
                },
                {
                  "fixed": "ce1ee2c8827fb6493e91acbd50f664cf2a972c3d"
                },
                {
                  "fixed": "17a0bc9bd697f75cfdf9b378d5eb2d7409c91340"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49879.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "2.6.30"
                },
                {
                  "fixed": "5.4.224"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.5.0"
                },
                {
                  "fixed": "5.10.154"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.78"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.0.8"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49879.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:48.900897579Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/156451a67b93986fb07c274ef6995ff40766c5ad",
        "https://git.kernel.org/stable/c/17a0bc9bd697f75cfdf9b378d5eb2d7409c91340",
        "https://git.kernel.org/stable/c/2fa24d0274fbf913b56ee31f15bc01168669d909",
        "https://git.kernel.org/stable/c/999cff2b6ce3b45c08abf793bf55534777421327",
        "https://git.kernel.org/stable/c/ce1ee2c8827fb6493e91acbd50f664cf2a972c3d",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49879.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-49879",
        "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/2022/49xxx/CVE-2022-49879.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-49879",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 516796,
  "published_at": "2025-05-01T14:10:27.117+00:00"
}