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              "value": "AV:L - The entire attack sequence is local syscalls/ioctls on a mounted f2fs volume \u2014 `FS_IOC_SETFLAGS`, `write()`, `F2FS_IOC_RELEASE_COMPRESS_BLOCKS`, then `truncate()`. There is no network or remote-peer component.\nAC:L - The commit message contains a straight-line shell reproducer with no race, timing window, or memory-layout dependency; the attacker deterministically drives every step. f2fs compression is a standard, widely deployed configuration (Android /data, embedded flash devices).\nPR:L - `f2fs_release_compress_blocks()` carries no capability check at all \u2014 only `mnt_want_write_file()` and an exclusive `i_writecount` test \u2014 and setting the compression flag and truncating require only ownership/write permission on the attacker\u0027s own file. An ordinary unprivileged user (or an Android app on its own data files) can perform the full sequence.\nUI:N - The attacker creates, flags, writes, releases, and truncates their own file on an already-mounted filesystem; no victim needs to mount anything, open anything, or act in any way.\nS:U - The corruption is confined to the kernel/filesystem security authority that already manages the affected volume; no VM, IOMMU, or sandbox boundary is crossed.\nC:N - The defect is block-accounting metadata desync (`i_blocks` / `total_valid_block_count` vs. the dnode); the newly allocated block is freshly written with the file\u0027s own decompressed data and no stale, out-of-bounds, or cross-file content is ever exposed to the attacker.\nI:H - It causes persistent, on-disk corruption of shared filesystem metadata \u2014 the inode\u0027s `i_blocks`, `i_compr_blocks` and the checkpoint\u0027s global `valid_block_count` \u2014 which survives reboot, is confirmed by fsck failure, and is not confined to the attacker\u0027s own file since the superblock/checkpoint accounting governs the whole volume.\nA:H - The skewed accounting reaches `f2fs_bug_on()` in `dec_valid_block_count()` and, once the over-reported free space is exhausted, `get_new_segment()`\u0027s `f2fs_stop_checkpoint(STOP_CP_REASON_NO_SEGMENT)` + `f2fs_bug_on(sbi, 1)` \u2014 a kernel BUG/panic under `CONFIG_F2FS_CHECK_FS`, otherwise a shut-down checkpoint that makes the filesystem return `-EIO` for everything and require offline fsck."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:29:51.830Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b8962cf98595d1ec62f40f23667de830567ec8bc"
        },
        {
          "url": "https://git.kernel.org/stable/c/8acae047215024d1ac499b3c8337ef1b952f160b"
        },
        {
          "url": "https://git.kernel.org/stable/c/3ccf5210dc941a7aa0180596ac021568be4d35ec"
        },
        {
          "url": "https://git.kernel.org/stable/c/9f9341064a9b5246a32a7fe56b9f80c6f7f3c62d"
        },
        {
          "url": "https://git.kernel.org/stable/c/5268241b41b1c5d0acca75e9b97d4fd719251c8c"
        },
        {
          "url": "https://git.kernel.org/stable/c/29ed2b5dd521ce7c5d8466cd70bf0cc9d07afeee"
        }
      ],
      "title": "f2fs: compress: don\u0027t allow unaligned truncation on released compress inode",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-33847",
    "datePublished": "2024-06-24T13:56:48.723Z",
    "dateReserved": "2024-06-24T13:54:11.027Z",
    "dateUpdated": "2026-08-05T11:29:51.830Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}