CVE-2024-33847 (GCVE-0-2024-33847)
Vulnerability from cvelistv5
Published
2024-06-24 13:56
Modified
2026-08-05 11:29
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: f2fs: compress: don't allow unaligned truncation on released compress inode f2fs image may be corrupted after below testcase: - mkfs.f2fs -O extra_attr,compression -f /dev/vdb - mount /dev/vdb /mnt/f2fs - touch /mnt/f2fs/file - f2fs_io setflags compression /mnt/f2fs/file - dd if=/dev/zero of=/mnt/f2fs/file bs=4k count=4 - f2fs_io release_cblocks /mnt/f2fs/file - truncate -s 8192 /mnt/f2fs/file - umount /mnt/f2fs - fsck.f2fs /dev/vdb [ASSERT] (fsck_chk_inode_blk:1256) --> ino: 0x5 has i_blocks: 0x00000002, but has 0x3 blocks [FSCK] valid_block_count matching with CP [Fail] [0x4, 0x5] [FSCK] other corrupted bugs [Fail] The reason is: partial truncation assume compressed inode has reserved blocks, after partial truncation, valid block count may change w/o .i_blocks and .total_valid_block_count update, result in corruption. This patch only allow cluster size aligned truncation on released compress inode for fixing.
References
Impacted products
Vendor Product Version
Linux Linux Version: 8e1651cd667cd6779db28314844d88b6de8312a3
Version: c61404153eb683da9c35aad133131554861ed561
Version: c61404153eb683da9c35aad133131554861ed561
Version: c61404153eb683da9c35aad133131554861ed561
Version: c61404153eb683da9c35aad133131554861ed561
Version: c61404153eb683da9c35aad133131554861ed561
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\"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nf2fs: compress: don\u0027t allow unaligned truncation on released compress inode\\n\\nf2fs image may be corrupted after below testcase:\\n- mkfs.f2fs -O extra_attr,compression -f /dev/vdb\\n- mount /dev/vdb /mnt/f2fs\\n- touch /mnt/f2fs/file\\n- f2fs_io setflags compression /mnt/f2fs/file\\n- dd if=/dev/zero of=/mnt/f2fs/file bs=4k count=4\\n- f2fs_io release_cblocks /mnt/f2fs/file\\n- truncate -s 8192 /mnt/f2fs/file\\n- umount /mnt/f2fs\\n- fsck.f2fs /dev/vdb\\n\\n[ASSERT] (fsck_chk_inode_blk:1256)  --\u003e ino: 0x5 has i_blocks: 0x00000002, but has 0x3 blocks\\n[FSCK] valid_block_count matching with CP             [Fail] [0x4, 0x5]\\n[FSCK] other corrupted bugs                           [Fail]\\n\\nThe reason is: partial truncation assume compressed inode has reserved\\nblocks, after partial truncation, valid block count may change w/o\\n.i_blocks and .total_valid_block_count update, result in corruption.\\n\\nThis patch only allow cluster size aligned truncation on released\\ncompress inode for fixing.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.161\", \"versionStartIncluding\": \"5.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.93\", \"versionStartIncluding\": \"5.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.33\", \"versionStartIncluding\": \"5.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9.4\", \"versionStartIncluding\": \"5.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10\", \"versionStartIncluding\": \"5.14\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:29:51.830Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-33847\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:29:51.830Z\", \"dateReserved\": \"2024-06-24T13:54:11.027Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-06-24T13:56:48.723Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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