{"id":"CVE-2024-35807","revision":"73f8fdeee2e041d29eb6f25625e5e681","records":[{"revision":"73f8fdeee2e041d29eb6f25625e5e681","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2024-35807","aliases":[],"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.","state":0,"publishedAt":"2024-05-17T13:23:14.869+00:00","modifiedAt":"2026-10-15T00:40:51.438+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/ext4/resize.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"01f795f9e0d67adeccc61a8b20c28acb45fa5fd8\",\n                            \"lessThan\": \"75cc31c2e7193b69f5d25650bda5bb42ed92f8a1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"01f795f9e0d67adeccc61a8b20c28acb45fa5fd8\",\n                            \"lessThan\": \"ee4e9c1976147a850f6085a13fca95bcaa00d84c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"01f795f9e0d67adeccc61a8b20c28acb45fa5fd8\",\n                            \"lessThan\": \"e8e8b197317228b5089ed9e7802dadf3ccaa027a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"01f795f9e0d67adeccc61a8b20c28acb45fa5fd8\",\n                            \"lessThan\": \"239c669edb2bffa1aa2612519b1d438ab35d6be6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"01f795f9e0d67adeccc61a8b20c28acb45fa5fd8\",\n                            \"lessThan\": \"fb1088d51bbaa0faec5a55d4f5818a9ab79e24df\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"01f795f9e0d67adeccc61a8b20c28acb45fa5fd8\",\n                            \"lessThan\": \"37b6a3ba793bbbae057f5b991970ebcc52cb3db5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"01f795f9e0d67adeccc61a8b20c28acb45fa5fd8\",\n                            \"lessThan\": \"b461910af8ba3bed80f48c2bf852686d05c6fc5c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"01f795f9e0d67adeccc61a8b20c28acb45fa5fd8\",\n                            \"lessThan\": \"722d2c01b8b108f8283d1b7222209d5b2a5aa7bd\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"01f795f9e0d67adeccc61a8b20c28acb45fa5fd8\",\n                            \"lessThan\": \"a6b3bfe176e8a5b05ec4447404e412c2a3fc92cc\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/ext4/resize.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3.7\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.7\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"4.19.312\",\n                            \"lessThanOrEqual\": \"4.19.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.4.274\",\n                            \"lessThanOrEqual\": \"5.4.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.215\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.154\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.84\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.24\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.7.12\",\n                            \"lessThanOrEqual\": \"6.7.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.8.3\",\n                            \"lessThanOrEqual\": \"6.8.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.9\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"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"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2024-35807","license":"CVE Program Terms of Use","key":"cve-program:CVE-2024-35807","identifiers":["CVE-2024-35807"]},"retained":false,"historicalAffected":[]}],"coverage":[]}