{"id":"CVE-2023-52622","url":"https://www.cyber-defence.io/tools/cve/CVE-2023-52622","generatedAt":"2026-10-28T01:13:09.575Z","title":"In the Linux kernel, the following vulnerability has been resolved: ext4: avoid online resizing failures due to oversized flex bg When we online resize an ext4 filesystem with a oversized flexbg_size, mkfs.ext4 -F -G 67108864 $dev -b 4096 100M mount…","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.","published":"2024-03-26T18:15:09.000Z","lastModified":"2026-10-15T01:17:15.000Z","status":"Modified","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","cvss":{"version":"3.1","score":5.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-770"],"affected":["linux/linux kernel","debian/debian linux"],"epss":{"score":0.00243,"percentile":0.15343,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.24%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://git.kernel.org/stable/c/5d1935ac02ca5aee364a449a35e2977ea84509b0","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6d2cbf517dcabc093159cf138ad5712c9c7fa954","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8b1413dbfe49646eda2c00c0f1144ee9d3368e0c","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b183fe8702e78bba3dcef8e7193cab6898abee07","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/cd1f93ca97a9136989f3bd2bf90696732a2ed644","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/cfbbb3199e71b63fc26cee0ebff327c47128a1e8","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d76c8d7ffe163c6bf2f1ef680b0539c2b3902b90","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/dc3e0f55bec4410f3d74352c4a7c79f518088ee2","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5d1935ac02ca5aee364a449a35e2977ea84509b0","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/6d2cbf517dcabc093159cf138ad5712c9c7fa954","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/8b1413dbfe49646eda2c00c0f1144ee9d3368e0c","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/b183fe8702e78bba3dcef8e7193cab6898abee07","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/cd1f93ca97a9136989f3bd2bf90696732a2ed644","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/cfbbb3199e71b63fc26cee0ebff327c47128a1e8","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/d76c8d7ffe163c6bf2f1ef680b0539c2b3902b90","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/dc3e0f55bec4410f3d74352c4a7c79f518088ee2","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html","tags":["Mailing List"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html","tags":["Mailing List"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-398330.html","source":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-613116.html","source":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-52622","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}