{"id":"CVE-2024-35807","state":"PUBLISHED","title":"ext4: fix corruption during on-line resize","description":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix corruption during on-line resize\n\nWe observed a corruption during on-line resize of a file system that is\nlarger than 16 TiB with 4k block size. With having more then 2^32 blocks\nresize_inode is turned off by default by mke2fs. The issue can be\nreproduced on a smaller file system for convenience by explicitly\nturning off resize_inode. An on-line resize across an 8 GiB boundary (the\nsize of a meta block group in this setup) then leads to a corruption:\n\n  dev=/dev/<some_dev> # should be >= 16 GiB\n  mkdir -p /corruption\n  /sbin/mke2fs -t ext4 -b 4096 -O ^resize_inode $dev $((2 * 2**21 - 2**15))\n  mount -t ext4 $dev /corruption\n\n  dd if=/dev/zero bs=4096 of=/corruption/test count=$((2*2**21 - 4*2**15))\n  sha1sum /corruption/test\n  # 79d2658b39dcfd77274e435b0934028adafaab11  /corruption/test\n\n  /sbin/resize2fs $dev $((2*2**21))\n  # drop page cache to force reload the block from disk\n  echo 1 > /proc/sys/vm/drop_caches\n\n  sha1sum /corruption/test\n  # 3c2abc63cbf1a94c9e6977e0fbd72cd832c4d5c3  /corruption/test\n\n2^21 = 2^15*2^6 equals 8 GiB whereof 2^15 is the number of blocks per\nblock group and 2^6 are the number of block groups that make a meta\nblock group.\n\nThe last checksum might be different depending on how the file is laid\nout across the physical blocks. The actual corruption occurs at physical\nblock 63*2^15 = 2064384 which would be the location of the backup of the\nmeta block group's block descriptor. During the on-line resize the file\nsystem will be converted to meta_bg starting at s_first_meta_bg which is\n2 in the example - meaning all block groups after 16 GiB. However, in\next4_flex_group_add we might add block groups that are not part of the\nfirst meta block group yet. In the reproducer we achieved this by\nsubstracting the size of a whole block group from the point where the\nmeta block group would start. This must be considered when updating the\nbackup block group descriptors to follow the non-meta_bg layout. The fix\nis to add a test whether the group to add is already part of the meta\nblock group or not.","publishedAt":"2024-05-17T13:23:14.869Z","updatedAt":"2026-10-15T00:40:51.438Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"01f795f9e0d67adeccc61a8b20c28acb45fa5fd8","status":"affected","lessThan":"75cc31c2e7193b69f5d25650bda5bb42ed92f8a1","versionType":"git"},{"version":"01f795f9e0d67adeccc61a8b20c28acb45fa5fd8","status":"affected","lessThan":"ee4e9c1976147a850f6085a13fca95bcaa00d84c","versionType":"git"},{"version":"01f795f9e0d67adeccc61a8b20c28acb45fa5fd8","status":"affected","lessThan":"e8e8b197317228b5089ed9e7802dadf3ccaa027a","versionType":"git"},{"version":"01f795f9e0d67adeccc61a8b20c28acb45fa5fd8","status":"affected","lessThan":"239c669edb2bffa1aa2612519b1d438ab35d6be6","versionType":"git"},{"version":"01f795f9e0d67adeccc61a8b20c28acb45fa5fd8","status":"affected","lessThan":"fb1088d51bbaa0faec5a55d4f5818a9ab79e24df","versionType":"git"},{"version":"01f795f9e0d67adeccc61a8b20c28acb45fa5fd8","status":"affected","lessThan":"37b6a3ba793bbbae057f5b991970ebcc52cb3db5","versionType":"git"},{"version":"01f795f9e0d67adeccc61a8b20c28acb45fa5fd8","status":"affected","lessThan":"b461910af8ba3bed80f48c2bf852686d05c6fc5c","versionType":"git"},{"version":"01f795f9e0d67adeccc61a8b20c28acb45fa5fd8","status":"affected","lessThan":"722d2c01b8b108f8283d1b7222209d5b2a5aa7bd","versionType":"git"},{"version":"01f795f9e0d67adeccc61a8b20c28acb45fa5fd8","status":"affected","lessThan":"a6b3bfe176e8a5b05ec4447404e412c2a3fc92cc","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ext4/resize.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.7","versionType":"semver"},{"version":"4.19.312","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.274","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.215","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.154","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.84","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.24","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.7.12","status":"unaffected","lessThanOrEqual":"6.7.*","versionType":"semver"},{"version":"6.8.3","status":"unaffected","lessThanOrEqual":"6.8.*","versionType":"semver"},{"version":"6.9","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ext4/resize.c"]}],"references":["https://git.kernel.org/stable/c/75cc31c2e7193b69f5d25650bda5bb42ed92f8a1","https://git.kernel.org/stable/c/ee4e9c1976147a850f6085a13fca95bcaa00d84c","https://git.kernel.org/stable/c/e8e8b197317228b5089ed9e7802dadf3ccaa027a","https://git.kernel.org/stable/c/239c669edb2bffa1aa2612519b1d438ab35d6be6","https://git.kernel.org/stable/c/fb1088d51bbaa0faec5a55d4f5818a9ab79e24df","https://git.kernel.org/stable/c/37b6a3ba793bbbae057f5b991970ebcc52cb3db5","https://git.kernel.org/stable/c/b461910af8ba3bed80f48c2bf852686d05c6fc5c","https://git.kernel.org/stable/c/722d2c01b8b108f8283d1b7222209d5b2a5aa7bd","https://git.kernel.org/stable/c/a6b3bfe176e8a5b05ec4447404e412c2a3fc92cc","https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html","https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html","https://cert-portal.siemens.com/productcert/html/ssa-398330.html","https://cert-portal.siemens.com/productcert/html/ssa-265688.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:07:30.303Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2024/35xxx/CVE-2024-35807.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-35807","state":"PUBLISHED","datePublished":"2024-05-17T13:23:14.869Z","dateUpdated":"2026-10-15T00:40:51.438Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-05-17T12:19:12.342Z"},"containers":{"cna":{"title":"ext4: fix corruption during on-line resize","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix corruption during on-line resize\n\nWe observed a corruption during on-line resize of a file system that is\nlarger than 16 TiB with 4k block size. With having more then 2^32 blocks\nresize_inode is turned off by default by mke2fs. The issue can be\nreproduced on a smaller file system for convenience by explicitly\nturning off resize_inode. An on-line resize across an 8 GiB boundary (the\nsize of a meta block group in this setup) then leads to a corruption:\n\n  dev=/dev/<some_dev> # should be >= 16 GiB\n  mkdir -p /corruption\n  /sbin/mke2fs -t ext4 -b 4096 -O ^resize_inode $dev $((2 * 2**21 - 2**15))\n  mount -t ext4 $dev /corruption\n\n  dd if=/dev/zero bs=4096 of=/corruption/test count=$((2*2**21 - 4*2**15))\n  sha1sum /corruption/test\n  # 79d2658b39dcfd77274e435b0934028adafaab11  /corruption/test\n\n  /sbin/resize2fs $dev $((2*2**21))\n  # drop page cache to force reload the block from disk\n  echo 1 > /proc/sys/vm/drop_caches\n\n  sha1sum /corruption/test\n  # 3c2abc63cbf1a94c9e6977e0fbd72cd832c4d5c3  /corruption/test\n\n2^21 = 2^15*2^6 equals 8 GiB whereof 2^15 is the number of blocks per\nblock group and 2^6 are the number of block groups that make a meta\nblock group.\n\nThe last checksum might be different depending on how the file is laid\nout across the physical blocks. The actual corruption occurs at physical\nblock 63*2^15 = 2064384 which would be the location of the backup of the\nmeta block group's block descriptor. During the on-line resize the file\nsystem will be converted to meta_bg starting at s_first_meta_bg which is\n2 in the example - meaning all block groups after 16 GiB. However, in\next4_flex_group_add we might add block groups that are not part of the\nfirst meta block group yet. In the reproducer we achieved this by\nsubstracting the size of a whole block group from the point where the\nmeta block group would start. This must be considered when updating the\nbackup block group descriptors to follow the non-meta_bg layout. The fix\nis to add a test whether the group to add is already part of the meta\nblock group or 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