Answer in brief
CVE-2023-52622 records a Unknown severity vulnerability in ext4: avoid online resizing failures due to oversized flex bg. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=28c7bac0091687e6116ebd6c179e154ae4053c90 <cd1f93ca97a9136989f3bd2bf90696732a2ed644 || >=28c7bac0091687e6116ebd6c179e154ae4053c90 <b183fe8702e78bba3dcef8e7193cab6898abee07 || >=28c7bac0091687e6116ebd6c179e154ae4053c90 <cfbbb3199e71b63fc26cee0ebff327c47128a1e8 || >=28c7bac0091687e6116ebd6c179e154ae4053c90 <d76c8d7ffe163c6bf2f1ef680b0539c2b3902b90 || >=28c7bac0091687e6116ebd6c179e154ae4053c90 <6d2cbf517dcabc093159cf138ad5712c9c7fa954 || >=28c7bac0091687e6116ebd6c179e154ae4053c90 <8b1413dbfe49646eda2c00c0f1144ee9d3368e0c || >=28c7bac0091687e6116ebd6c179e154ae4053c90 <dc3e0f55bec4410f3d74352c4a7c79f518088ee2 || >=28c7bac0091687e6116ebd6c179e154ae4053c90 <5d1935ac02ca5aee364a449a35e2977ea84509b0 | cd1f93ca97a9136989f3bd2bf90696732a2ed644, b183fe8702e78bba3dcef8e7193cab6898abee07, cfbbb3199e71b63fc26cee0ebff327c47128a1e8, d76c8d7ffe163c6bf2f1ef680b0539c2b3902b90, 6d2cbf517dcabc093159cf138ad5712c9c7fa954, 8b1413dbfe49646eda2c00c0f1144ee9d3368e0c, dc3e0f55bec4410f3d74352c4a7c79f518088ee2, 5d1935ac02ca5aee364a449a35e2977ea84509b0 |
| Linux/Linuxgeneric | 3.3 | Not reported |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.0 <V3.1.5 | V3.1.5 |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.0 <V3.1.5 | V3.1.5 |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.0 <V3.1.5 | V3.1.5 |
Published upstream
Mar 26, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.