CVE-2024-26704 (GCVE-0-2024-26704)
Vulnerability from cvelistv5
Published
2024-04-03 14:55
Modified
2025-05-04 08:54
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: fix double-free of blocks due to wrong extents moved_len In ext4_move_extents(), moved_len is only updated when all moves are successfully executed, and only discards orig_inode and donor_inode preallocations when moved_len is not zero. When the loop fails to exit after successfully moving some extents, moved_len is not updated and remains at 0, so it does not discard the preallocations. If the moved extents overlap with the preallocated extents, the overlapped extents are freed twice in ext4_mb_release_inode_pa() and ext4_process_freed_data() (as described in commit 94d7c16cbbbd ("ext4: Fix double-free of blocks with EXT4_IOC_MOVE_EXT")), and bb_free is incremented twice. Hence when trim is executed, a zero-division bug is triggered in mb_update_avg_fragment_size() because bb_free is not zero and bb_fragments is zero. Therefore, update move_len after each extent move to avoid the issue.
References
Impacted products
Vendor Product Version
Linux Linux Version: fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a
Version: fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a
Version: fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a
Version: fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a
Version: fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a
Version: fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a
Version: fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a
Version: fcf6b1b729bcd23f2b49a84fb33ffbb44712ee6a
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double-free of blocks due to wrong extents moved_len\\n\\nIn ext4_move_extents(), moved_len is only updated when all moves are\\nsuccessfully executed, and only discards orig_inode and donor_inode\\npreallocations when moved_len is not zero. When the loop fails to exit\\nafter successfully moving some extents, moved_len is not updated and\\nremains at 0, so it does not discard the preallocations.\\n\\nIf the moved extents overlap with the preallocated extents, the\\noverlapped extents are freed twice in ext4_mb_release_inode_pa() and\\next4_process_freed_data() (as described in commit 94d7c16cbbbd (\\\"ext4:\\nFix double-free of blocks with EXT4_IOC_MOVE_EXT\\\")), and bb_free is\\nincremented twice. Hence when trim is executed, a zero-division bug is\\ntriggered in mb_update_avg_fragment_size() because bb_free is not zero\\nand bb_fragments is zero.\\n\\nTherefore, update move_len after each extent move to avoid the issue.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.307\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.269\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.210\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.149\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.79\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.18\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.6\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8\", \"versionStartIncluding\": \"3.18\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T08:54:27.242Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26704\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T08:54:27.242Z\", \"dateReserved\": \"2024-02-19T14:20:24.158Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-04-03T14:55:02.672Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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