{"id":"CVE-2023-52622","state":"PUBLISHED","title":"ext4: avoid online resizing failures due to oversized flex bg","description":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: avoid online resizing failures due to oversized flex bg\n\nWhen we online resize an ext4 filesystem with a oversized flexbg_size,\n\n     mkfs.ext4 -F -G 67108864 $dev -b 4096 100M\n     mount $dev $dir\n     resize2fs $dev 16G\n\nthe following WARN_ON is triggered:\n==================================================================\nWARNING: CPU: 0 PID: 427 at mm/page_alloc.c:4402 __alloc_pages+0x411/0x550\nModules linked in: sg(E)\nCPU: 0 PID: 427 Comm: resize2fs Tainted: G  E  6.6.0-rc5+ #314\nRIP: 0010:__alloc_pages+0x411/0x550\nCall Trace:\n <TASK>\n __kmalloc_large_node+0xa2/0x200\n __kmalloc+0x16e/0x290\n ext4_resize_fs+0x481/0xd80\n __ext4_ioctl+0x1616/0x1d90\n ext4_ioctl+0x12/0x20\n __x64_sys_ioctl+0xf0/0x150\n do_syscall_64+0x3b/0x90\n==================================================================\n\nThis is because flexbg_size is too large and the size of the new_group_data\narray to be allocated exceeds MAX_ORDER. Currently, the minimum value of\nMAX_ORDER is 8, the minimum value of PAGE_SIZE is 4096, the corresponding\nmaximum number of groups that can be allocated is:\n\n (PAGE_SIZE << MAX_ORDER) / sizeof(struct ext4_new_group_data) ≈ 21845\n\nAnd the value that is down-aligned to the power of 2 is 16384. Therefore,\nthis value is defined as MAX_RESIZE_BG, and the number of groups added\neach time does not exceed this value during resizing, and is added multiple\ntimes to complete the online resizing. The difference is that the metadata\nin a flex_bg may be more dispersed.","publishedAt":"2024-03-26T17:19:23.838Z","updatedAt":"2026-10-15T00:17:06.250Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"28c7bac0091687e6116ebd6c179e154ae4053c90","status":"affected","lessThan":"cd1f93ca97a9136989f3bd2bf90696732a2ed644","versionType":"git"},{"version":"28c7bac0091687e6116ebd6c179e154ae4053c90","status":"affected","lessThan":"b183fe8702e78bba3dcef8e7193cab6898abee07","versionType":"git"},{"version":"28c7bac0091687e6116ebd6c179e154ae4053c90","status":"affected","lessThan":"cfbbb3199e71b63fc26cee0ebff327c47128a1e8","versionType":"git"},{"version":"28c7bac0091687e6116ebd6c179e154ae4053c90","status":"affected","lessThan":"d76c8d7ffe163c6bf2f1ef680b0539c2b3902b90","versionType":"git"},{"version":"28c7bac0091687e6116ebd6c179e154ae4053c90","status":"affected","lessThan":"6d2cbf517dcabc093159cf138ad5712c9c7fa954","versionType":"git"},{"version":"28c7bac0091687e6116ebd6c179e154ae4053c90","status":"affected","lessThan":"8b1413dbfe49646eda2c00c0f1144ee9d3368e0c","versionType":"git"},{"version":"28c7bac0091687e6116ebd6c179e154ae4053c90","status":"affected","lessThan":"dc3e0f55bec4410f3d74352c4a7c79f518088ee2","versionType":"git"},{"version":"28c7bac0091687e6116ebd6c179e154ae4053c90","status":"affected","lessThan":"5d1935ac02ca5aee364a449a35e2977ea84509b0","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":"3.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.3","versionType":"semver"},{"version":"4.19.307","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.269","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.210","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.149","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.77","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.16","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.7.4","status":"unaffected","lessThanOrEqual":"6.7.*","versionType":"semver"},{"version":"6.8","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/cd1f93ca97a9136989f3bd2bf90696732a2ed644","https://git.kernel.org/stable/c/b183fe8702e78bba3dcef8e7193cab6898abee07","https://git.kernel.org/stable/c/cfbbb3199e71b63fc26cee0ebff327c47128a1e8","https://git.kernel.org/stable/c/d76c8d7ffe163c6bf2f1ef680b0539c2b3902b90","https://git.kernel.org/stable/c/6d2cbf517dcabc093159cf138ad5712c9c7fa954","https://git.kernel.org/stable/c/8b1413dbfe49646eda2c00c0f1144ee9d3368e0c","https://git.kernel.org/stable/c/dc3e0f55bec4410f3d74352c4a7c79f518088ee2","https://git.kernel.org/stable/c/5d1935ac02ca5aee364a449a35e2977ea84509b0","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-613116.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:06:33.064Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/52xxx/CVE-2023-52622.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-52622","state":"PUBLISHED","datePublished":"2024-03-26T17:19:23.838Z","dateUpdated":"2026-10-15T00:17:06.250Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-03-06T09:52:12.090Z"},"containers":{"cna":{"title":"ext4: avoid online resizing failures due to oversized flex bg","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: avoid online resizing failures due to oversized flex bg\n\nWhen we online resize an ext4 filesystem with a oversized flexbg_size,\n\n     mkfs.ext4 -F -G 67108864 $dev -b 4096 100M\n     mount $dev $dir\n     resize2fs $dev 16G\n\nthe following WARN_ON is triggered:\n==================================================================\nWARNING: CPU: 0 PID: 427 at mm/page_alloc.c:4402 __alloc_pages+0x411/0x550\nModules linked in: sg(E)\nCPU: 0 PID: 427 Comm: resize2fs Tainted: G  E  6.6.0-rc5+ #314\nRIP: 0010:__alloc_pages+0x411/0x550\nCall Trace:\n <TASK>\n __kmalloc_large_node+0xa2/0x200\n __kmalloc+0x16e/0x290\n ext4_resize_fs+0x481/0xd80\n __ext4_ioctl+0x1616/0x1d90\n ext4_ioctl+0x12/0x20\n __x64_sys_ioctl+0xf0/0x150\n do_syscall_64+0x3b/0x90\n==================================================================\n\nThis is because flexbg_size is too large and the size of the new_group_data\narray to be allocated exceeds MAX_ORDER. Currently, the minimum value of\nMAX_ORDER is 8, the minimum value of PAGE_SIZE is 4096, the corresponding\nmaximum number of groups that can be allocated is:\n\n (PAGE_SIZE << MAX_ORDER) / sizeof(struct ext4_new_group_data) ≈ 21845\n\nAnd the value that is down-aligned to the power of 2 is 16384. Therefore,\nthis value is defined as MAX_RESIZE_BG, and the number of groups added\neach time does not exceed this value during resizing, and is added multiple\ntimes to complete the online resizing. The difference is that the metadata\nin a flex_bg may be more dispersed."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"28c7bac0091687e6116ebd6c179e154ae4053c90","status":"affected","lessThan":"cd1f93ca97a9136989f3bd2bf90696732a2ed644","versionType":"git"},{"version":"28c7bac0091687e6116ebd6c179e154ae4053c90","status":"affected","lessThan":"b183fe8702e78bba3dcef8e7193cab6898abee07","versionType":"git"},{"version":"28c7bac0091687e6116ebd6c179e154ae4053c90","status":"affected","lessThan":"cfbbb3199e71b63fc26cee0ebff327c47128a1e8","versionType":"git"},{"version":"28c7bac0091687e6116ebd6c179e154ae4053c90","status":"affected","lessThan":"d76c8d7ffe163c6bf2f1ef680b0539c2b3902b90","versionType":"git"},{"version":"28c7bac0091687e6116ebd6c179e154ae4053c90","status":"affected","lessThan":"6d2cbf517dcabc093159cf138ad5712c9c7fa954","versionType":"git"},{"version":"28c7bac0091687e6116ebd6c179e154ae4053c90","status":"affected","lessThan":"8b1413dbfe49646eda2c00c0f1144ee9d3368e0c","versionType":"git"},{"version":"28c7bac0091687e6116ebd6c179e154ae4053c90","status":"affected","lessThan":"dc3e0f55bec4410f3d74352c4a7c79f518088ee2","versionType":"git"},{"version":"28c7bac0091687e6116ebd6c179e154ae4053c90","status":"affected","lessThan":"5d1935ac02ca5aee364a449a35e2977ea84509b0","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":"3.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.3","versionType":"semver"},{"version":"4.19.307","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.269","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.210","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.149","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.77","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.16","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.7.4","status":"unaffected","lessThanOrEqual":"6.7.*","versionType":"semver"},{"version":"6.8","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":[{"url":"https://git.kernel.org/stable/c/cd1f93ca97a9136989f3bd2bf90696732a2ed644"},{"url":"https://git.kernel.org/stable/c/b183fe8702e78bba3dcef8e7193cab6898abee07"},{"url":"https://git.kernel.org/stable/c/cfbbb3199e71b63fc26cee0ebff327c47128a1e8"},{"url":"https://git.kernel.org/stable/c/d76c8d7ffe163c6bf2f1ef680b0539c2b3902b90"},{"url":"https://git.kernel.org/stable/c/6d2cbf517dcabc093159cf138ad5712c9c7fa954"},{"url":"https://git.kernel.org/stable/c/8b1413dbfe49646eda2c00c0f1144ee9d3368e0c"},{"url":"https://git.kernel.org/stable/c/dc3e0f55bec4410f3d74352c4a7c79f518088ee2"},{"url":"https://git.kernel.org/stable/c/5d1935ac02ca5aee364a449a35e2977ea84509b0"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T19:30:32.665Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"4.19.307"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"5.4.269"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"5.10.210"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"5.15.149"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"6.1.77"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"6.6.16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"6.7.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"6.8"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA 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