CVE-2023-52622ext4: avoid online resizing failures due to oversized flex bg
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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 $dev $dir resize2fs $dev 16G the following WARN_ON is triggered: ================================================================== WARNING: CPU: 0 PID: 427 at mm/page_alloc.c:4402 __alloc_pages+0x411/0x550 Modules linked in: sg(E) CPU: 0 PID: 427 Comm: resize2fs Tainted: G E 6.6.0-rc5+ #314 RIP: 0010:__alloc_pages+0x411/0x550 Call Trace: <TASK> __kmalloc_large_node+0xa2/0x200 __kmalloc+0x16e/0x290 ext4_resize_fs+0x481/0xd80 __ext4_ioctl+0x1616/0x1d90 ext4_ioctl+0x12/0x20 __x64_sys_ioctl+0xf0/0x150 do_syscall_64+0x3b/0x90 ================================================================== This is because flexbg_size is too large and the size of the new_group_data array to be allocated exceeds MAX_ORDER. Currently, the minimum value of MAX_ORDER is 8, the minimum value of PAGE_SIZE is 4096, the corresponding maximum number of groups that can be allocated is: (PAGE_SIZE << MAX_ORDER) / sizeof(struct ext4_new_group_data) ≈ 21845 And the value that is down-aligned to the power of 2 is 16384. Therefore, this value is defined as MAX_RESIZE_BG, and the number of groups added each time does not exceed this value during resizing, and is added multiple times to complete the online resizing. The difference is that the metadata in a flex_bg may be more dispersed.
- CVSS
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from 28c7bac0091687e6116ebd6c179e154ae4053c90 before cd1f93ca97a9136989f3bd2bf90696732a2ed644; from 28c7bac0091687e6116ebd6c179e154ae4053c90 before b183fe8702e78bba3dcef8e7193cab6898abee07; from 28c7bac0091687e6116ebd6c179e154ae4053c90 before cfbbb3199e71b63fc26cee0ebff327c47128a1e8; from 28c7bac0091687e6116ebd6c179e154ae4053c90 before d76c8d7ffe163c6bf2f1ef680b0539c2b3902b90; 28c7bac0091687e6116ebd6c179e154ae4053c90 builds before 6d2cbf517dcabc093159cf138ad5712c9c7fa954; 28c7bac0091687e6116ebd6c179e154ae4053c90 builds before 8b1413dbfe49646eda2c00c0f1144ee9d3368e0c; from 28c7bac0091687e6116ebd6c179e154ae4053c90 before dc3e0f55bec4410f3d74352c4a7c79f518088ee2; 28c7bac0091687e6116ebd6c179e154ae4053c90 builds before 5d1935ac02ca5aee364a449a35e2977ea84509b0 | CNA record |
Siemens RUGGEDCOM RST2428P siemens:ruggedcom_rst2428p (from the name) | all versions not affected | CISA ADP |
Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family siemens:scalance_xc_300_xr_300_xc_400_xr_500wg_xr_500_family (from the name) | all versions not affected | CISA ADP |
Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family siemens:scalance_xcm_xrm_xch_xrh_300_family (from the name) | all versions not affected | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
linux linux_kernel linux:linux_kernel | before 4.19.307; from 4.20 before 5.4.269; from 5.5 before 5.10.210; from 5.11 before 5.15.149; from 5.16 before 6.1.77; from 6.2 before 6.6.16; from 6.7 before 6.7.4 | NVD |
debian debian_linux debian:debian_linux | 10.0 | NVD |
References
- https://git.kernel.org/stable/c/cd1f93ca97a9136989f3bd2bf90696732a2ed644patch
- https://git.kernel.org/stable/c/b183fe8702e78bba3dcef8e7193cab6898abee07patch
- https://git.kernel.org/stable/c/cfbbb3199e71b63fc26cee0ebff327c47128a1e8patch
- https://git.kernel.org/stable/c/d76c8d7ffe163c6bf2f1ef680b0539c2b3902b90patch
- https://git.kernel.org/stable/c/6d2cbf517dcabc093159cf138ad5712c9c7fa954patch
- https://git.kernel.org/stable/c/8b1413dbfe49646eda2c00c0f1144ee9d3368e0cpatch
- https://git.kernel.org/stable/c/dc3e0f55bec4410f3d74352c4a7c79f518088ee2patch
- https://git.kernel.org/stable/c/5d1935ac02ca5aee364a449a35e2977ea84509b0patch
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.htmlmailing-list
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.htmlmailing-list
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
- https://cert-portal.siemens.com/productcert/html/ssa-613116.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.